1. NATM (New Austrian Tunneling Method) is a flexible tunneling method that utilizes shotcrete, wire mesh, rock bolts, and lattice girders for tunnel support. It mobilizes the strength of the rock mass and uses dynamic design that adapts the support based on rock conditions.
2. Excavation in NATM progresses from top heading to benches in poor rock. It is done in small sequential cells to support unstable ground. Primary lining of shotcrete is applied immediately after excavation.
3. Rock mass is classified using methods like RQD, RMR, and Q-factor to determine appropriate support. Flexible shotcrete and bolting allow adaptation to changing geology encountered during tunnel
Tunnel is an artificially constructed underground passage to by- pass obstacles safely without disturbing the over burden. This module explains about tunnels, their parts, types and importance.
PPT on execution of 680 m long tunnel ensuring safety of the adjoining rail t...Rajesh Prasad
The said paper by Rajesh Prasad Executive Director RVNL has been published in IPWE international seminar held on 23/24-02-2018. The power point presentation nicely explains about how the technical challenges and administrative challenges addressed in completion of the tunnel while constructing a tunnel by the side of a railway tunnel with train operation in place and the entire area is affected by LWE activities.
Lining is an integral part of Tunneling. Once the Shotcrete line ,i.e the B-line,is laid, the Kerb/Kicker or Say Beam is executed. Next Comes the Geotextile/Waterproofing Membrane. After that, C-line is laid which is referred to as inner lining.
Closing Lecture: World Tunnel Congress 2014, Iguassu Falls, Brazil
Quo Vadis Tunnel Engineering?Predicting the Unpredictable
by Z T Richard Bieniawski v. Preinl
Tunnel is an artificially constructed underground passage to by- pass obstacles safely without disturbing the over burden. This module explains about tunnels, their parts, types and importance.
PPT on execution of 680 m long tunnel ensuring safety of the adjoining rail t...Rajesh Prasad
The said paper by Rajesh Prasad Executive Director RVNL has been published in IPWE international seminar held on 23/24-02-2018. The power point presentation nicely explains about how the technical challenges and administrative challenges addressed in completion of the tunnel while constructing a tunnel by the side of a railway tunnel with train operation in place and the entire area is affected by LWE activities.
Lining is an integral part of Tunneling. Once the Shotcrete line ,i.e the B-line,is laid, the Kerb/Kicker or Say Beam is executed. Next Comes the Geotextile/Waterproofing Membrane. After that, C-line is laid which is referred to as inner lining.
Closing Lecture: World Tunnel Congress 2014, Iguassu Falls, Brazil
Quo Vadis Tunnel Engineering?Predicting the Unpredictable
by Z T Richard Bieniawski v. Preinl
The Austrian Standards Institute published ÖNORM B 2203-1 “Underground Works – Works contract, Part 1: Cyclic driving (conventional tunnelling)” in 2001.
This Austrian Standard includes particular directives for tendering procedures, preparation of the bid and terms of contract for the execution of conventional tunnelling called “New Austrian Tunnelling Method (NATM)”.
In addition to the Standard the Austrian Society for Geomechanics in 2011 published the document “The Austrian Practice of NATM Tunnelling Contracts” which describes the application of the Standard in detail with respect to the NATM. The main chapters of the document are
Tendering and Costing as well as Construction and Payment with information in detail about
time-dependent costs,
tunnelling interruptions
, tunnel classes
, difficulties due to water ingress
, over-excavation, excess concrete
, selection of supporting measures and classifying tunnelling
. Examples describing the method are presented in an annex
. The Austrian Society for Geomechanics recommends the download of this document in addition to the Austrian Standard ÖNORM B 2203-1:2001. The document “The Austrian Practice of NATM Tunnelling Contracts” with its annex is free of charge. Learn more: http://www.as-institute.at/en/standards/downloads.html
Tunnel T80 across Pir Panjal Mountain Range: The Longest Transportation Tunne...Hitesh Khanna
The Presentation Covers the General Technical Features of Tunnel T 80 across Pir Panjal Mountain Range, for Kashmir Rail Link. This presentation was made at Civil Engineering Society, IIT Kanpur on 30th September 2013.
Review of the case study of the Yangcheng Coal Mine in ChinaOnur Tuncay
Main resource: Research Article
Failure Mechanism Analysis and Support Design for
Deep Composite Soft Rock Roadway: A Case Study of the
Yangcheng Coal Mine in China
Bangyou Jiang, Lianguo Wang, Yinlong Lu, Shitan Gu, and Xiaokang Sun
The pattern of Slopes Pattern in Rock Media
By: Omitogun Solomon T.
Student(MSc. Geology-Engineering Geology/Hydrogeology-2018/2019 set) University of Lagos, Nigeria
solotosin6@gmail.com
The Evolution of Sublevel Caving at Trojan Mine, Bindura, Zimbabwe, J G TaylorJohn Guy Taylor
Several technical and economic factors have to be taken into
consideration in developing an optimal mining method. This paper
describes some of the important factors learnt during the evolution of the
sub-level cave mining method at Trojan Nickel Mine, part of the Bindura
Nickel Corporation (BNC) in Zimbabwe.
A Study in Various Techniques, Advances and Issues Used for Rock MassesIJRES Journal
Purpose of this article is to review important parts of rock investigation. However site investigation cost is so less than construction cost but it’s role is vital. In this article firstly, we explain Rock mechanics in field such as Geological observations, drilling of the holes, sampling and in situ testing and secondly we’re going explain about strength index of rock mass, rock mechanics in laboratory. This article consist of important concept of famous rock mechanics books and article and we hope that be effective and practical for rock mechanics engineers.
In this ppt you will get all information regarding shaft sinking. Like what is permanent lining and temporary lining. How to decide shape of shaft, drilling blasting, support, lighting in shaft. Use of shaft and skips.
Cosmetic shop management system project report.pdfKamal Acharya
Buying new cosmetic products is difficult. It can even be scary for those who have sensitive skin and are prone to skin trouble. The information needed to alleviate this problem is on the back of each product, but it's thought to interpret those ingredient lists unless you have a background in chemistry.
Instead of buying and hoping for the best, we can use data science to help us predict which products may be good fits for us. It includes various function programs to do the above mentioned tasks.
Data file handling has been effectively used in the program.
The automated cosmetic shop management system should deal with the automation of general workflow and administration process of the shop. The main processes of the system focus on customer's request where the system is able to search the most appropriate products and deliver it to the customers. It should help the employees to quickly identify the list of cosmetic product that have reached the minimum quantity and also keep a track of expired date for each cosmetic product. It should help the employees to find the rack number in which the product is placed.It is also Faster and more efficient way.
Event Management System Vb Net Project Report.pdfKamal Acharya
In present era, the scopes of information technology growing with a very fast .We do not see any are untouched from this industry. The scope of information technology has become wider includes: Business and industry. Household Business, Communication, Education, Entertainment, Science, Medicine, Engineering, Distance Learning, Weather Forecasting. Carrier Searching and so on.
My project named “Event Management System” is software that store and maintained all events coordinated in college. It also helpful to print related reports. My project will help to record the events coordinated by faculties with their Name, Event subject, date & details in an efficient & effective ways.
In my system we have to make a system by which a user can record all events coordinated by a particular faculty. In our proposed system some more featured are added which differs it from the existing system such as security.
Automobile Management System Project Report.pdfKamal Acharya
The proposed project is developed to manage the automobile in the automobile dealer company. The main module in this project is login, automobile management, customer management, sales, complaints and reports. The first module is the login. The automobile showroom owner should login to the project for usage. The username and password are verified and if it is correct, next form opens. If the username and password are not correct, it shows the error message.
When a customer search for a automobile, if the automobile is available, they will be taken to a page that shows the details of the automobile including automobile name, automobile ID, quantity, price etc. “Automobile Management System” is useful for maintaining automobiles, customers effectively and hence helps for establishing good relation between customer and automobile organization. It contains various customized modules for effectively maintaining automobiles and stock information accurately and safely.
When the automobile is sold to the customer, stock will be reduced automatically. When a new purchase is made, stock will be increased automatically. While selecting automobiles for sale, the proposed software will automatically check for total number of available stock of that particular item, if the total stock of that particular item is less than 5, software will notify the user to purchase the particular item.
Also when the user tries to sale items which are not in stock, the system will prompt the user that the stock is not enough. Customers of this system can search for a automobile; can purchase a automobile easily by selecting fast. On the other hand the stock of automobiles can be maintained perfectly by the automobile shop manager overcoming the drawbacks of existing system.
COLLEGE BUS MANAGEMENT SYSTEM PROJECT REPORT.pdfKamal Acharya
The College Bus Management system is completely developed by Visual Basic .NET Version. The application is connect with most secured database language MS SQL Server. The application is develop by using best combination of front-end and back-end languages. The application is totally design like flat user interface. This flat user interface is more attractive user interface in 2017. The application is gives more important to the system functionality. The application is to manage the student’s details, driver’s details, bus details, bus route details, bus fees details and more. The application has only one unit for admin. The admin can manage the entire application. The admin can login into the application by using username and password of the admin. The application is develop for big and small colleges. It is more user friendly for non-computer person. Even they can easily learn how to manage the application within hours. The application is more secure by the admin. The system will give an effective output for the VB.Net and SQL Server given as input to the system. The compiled java program given as input to the system, after scanning the program will generate different reports. The application generates the report for users. The admin can view and download the report of the data. The application deliver the excel format reports. Because, excel formatted reports is very easy to understand the income and expense of the college bus. This application is mainly develop for windows operating system users. In 2017, 73% of people enterprises are using windows operating system. So the application will easily install for all the windows operating system users. The application-developed size is very low. The application consumes very low space in disk. Therefore, the user can allocate very minimum local disk space for this application.
Welcome to WIPAC Monthly the magazine brought to you by the LinkedIn Group Water Industry Process Automation & Control.
In this month's edition, along with this month's industry news to celebrate the 13 years since the group was created we have articles including
A case study of the used of Advanced Process Control at the Wastewater Treatment works at Lleida in Spain
A look back on an article on smart wastewater networks in order to see how the industry has measured up in the interim around the adoption of Digital Transformation in the Water Industry.
Final project report on grocery store management system..pdfKamal Acharya
In today’s fast-changing business environment, it’s extremely important to be able to respond to client needs in the most effective and timely manner. If your customers wish to see your business online and have instant access to your products or services.
Online Grocery Store is an e-commerce website, which retails various grocery products. This project allows viewing various products available enables registered users to purchase desired products instantly using Paytm, UPI payment processor (Instant Pay) and also can place order by using Cash on Delivery (Pay Later) option. This project provides an easy access to Administrators and Managers to view orders placed using Pay Later and Instant Pay options.
In order to develop an e-commerce website, a number of Technologies must be studied and understood. These include multi-tiered architecture, server and client-side scripting techniques, implementation technologies, programming language (such as PHP, HTML, CSS, JavaScript) and MySQL relational databases. This is a project with the objective to develop a basic website where a consumer is provided with a shopping cart website and also to know about the technologies used to develop such a website.
This document will discuss each of the underlying technologies to create and implement an e- commerce website.
Forklift Classes Overview by Intella PartsIntella Parts
Discover the different forklift classes and their specific applications. Learn how to choose the right forklift for your needs to ensure safety, efficiency, and compliance in your operations.
For more technical information, visit our website https://intellaparts.com
Hybrid optimization of pumped hydro system and solar- Engr. Abdul-Azeez.pdffxintegritypublishin
Advancements in technology unveil a myriad of electrical and electronic breakthroughs geared towards efficiently harnessing limited resources to meet human energy demands. The optimization of hybrid solar PV panels and pumped hydro energy supply systems plays a pivotal role in utilizing natural resources effectively. This initiative not only benefits humanity but also fosters environmental sustainability. The study investigated the design optimization of these hybrid systems, focusing on understanding solar radiation patterns, identifying geographical influences on solar radiation, formulating a mathematical model for system optimization, and determining the optimal configuration of PV panels and pumped hydro storage. Through a comparative analysis approach and eight weeks of data collection, the study addressed key research questions related to solar radiation patterns and optimal system design. The findings highlighted regions with heightened solar radiation levels, showcasing substantial potential for power generation and emphasizing the system's efficiency. Optimizing system design significantly boosted power generation, promoted renewable energy utilization, and enhanced energy storage capacity. The study underscored the benefits of optimizing hybrid solar PV panels and pumped hydro energy supply systems for sustainable energy usage. Optimizing the design of solar PV panels and pumped hydro energy supply systems as examined across diverse climatic conditions in a developing country, not only enhances power generation but also improves the integration of renewable energy sources and boosts energy storage capacities, particularly beneficial for less economically prosperous regions. Additionally, the study provides valuable insights for advancing energy research in economically viable areas. Recommendations included conducting site-specific assessments, utilizing advanced modeling tools, implementing regular maintenance protocols, and enhancing communication among system components.
Quality defects in TMT Bars, Possible causes and Potential Solutions.PrashantGoswami42
Maintaining high-quality standards in the production of TMT bars is crucial for ensuring structural integrity in construction. Addressing common defects through careful monitoring, standardized processes, and advanced technology can significantly improve the quality of TMT bars. Continuous training and adherence to quality control measures will also play a pivotal role in minimizing these defects.
Explore the innovative world of trenchless pipe repair with our comprehensive guide, "The Benefits and Techniques of Trenchless Pipe Repair." This document delves into the modern methods of repairing underground pipes without the need for extensive excavation, highlighting the numerous advantages and the latest techniques used in the industry.
Learn about the cost savings, reduced environmental impact, and minimal disruption associated with trenchless technology. Discover detailed explanations of popular techniques such as pipe bursting, cured-in-place pipe (CIPP) lining, and directional drilling. Understand how these methods can be applied to various types of infrastructure, from residential plumbing to large-scale municipal systems.
Ideal for homeowners, contractors, engineers, and anyone interested in modern plumbing solutions, this guide provides valuable insights into why trenchless pipe repair is becoming the preferred choice for pipe rehabilitation. Stay informed about the latest advancements and best practices in the field.
The Benefits and Techniques of Trenchless Pipe Repair.pdf
NATM (New Austrian Tunneling Method ) in Tunneling
1. 1
NATM (NewAustrian Tunneling Method ) in Tunneling
Def of Tunneling:Underground passage dug though hill, under road or river
etc. for passage of road, train etc.
Various Approaches forTunnel construction:
1) Drill & Blast System: Under this the mode can be broadly divided
into:
a) Conventional Tunneling system: In this approach used from
earlier times the excavated rock mass is supported with/without
use of steel ribs made up generally of ISMB/ISHB with the
different spacing depending upon the rock mass type along with
lagging generally made of cement concrete M15 these days.
The space between the steel support/lagging and excavated
section is filled with lower grade of cement concrete generally
M10 backfill. Sometimes shotcrete with use of rock bolts is
also resorted. However the final lining where required is also
given of plain cement concrete generally M20 grade.
b) NATM: This method has been developed basically in Austria
so its name make use of providing flexible primary lining in
shape of shotcrete , wire mesh, rock bolts ,lattice girder. In case
of weaker rock mass the use of pipe forepole/pipe roofing is
also resrted for crown support which in turn lead to less
overbreak as well as ensure safety during the execution. The
main aspect of the approach is dynamic design based on rock
mass classification as well as the in situ deformation observed.
Hence more economical use of the tunnel support system along
with the rational approach of execution.
2. 2
2) Tunnel Boring Machine : This method is totally mechanized but
capital intensive. It is very much suitable where there is reasonablly
kind of rock mass to be encountered during construction and not
suitable for highly varying geology. Here lining can be done with
precast member just behind the tunneling.
History of NATM:
The term New Austrian Tunneling Method Popularly Known as
NATM got its name from Salzburg (Austria). It was first used by Mr
Rabcewicz in 1962. It got world wise recognition in1964. This method has
been evolved as a result of experience gained in Austrian Alpine tunneling
condition. The first use of NATM in soft ground tunneling is done in
Frankfurt metro in 1969. The basic aim of NATM is for getting stable and
economic tunnel support systems. This method has been very useful in
complex diversified geological condition where forecasting of the rock mass
is difficult due to rapidly changing geology.
Broad Principles of NATM :
NATM broadly based on the following principles:
• Mobilization of the strength of rock mass - The method relies on
the inherent strength of the rock mass being conserved as the main
component of tunnel support. Primary support is directed to enable the
rock to support itself.
• Shotcrete protection - Loosening and excessive rock mass
deformation should be minimised by applying a layer 25-50mm of
sealing shotcrete immediately after opening of the face.
3. 3
• Measurements - Every deformation of the excavation must be
measured. NATM requires installation of sophisticated measurement
instrumentation. It is embedded in lining, ground such as load
cells,extensometers and relectors.
• Primary Lining - The primary lining is thin.It is active support and
the tunnel is strengthened not by a thicker concrete lining but by a
flexible combination of rock bolts, wire mesh and Lattice girders.
• Closing of invert – Early as far as possible closing the invert so as to
complete the arch action and creating a load-bearing ring is important.
It is crucial in soft ground tunnels
• Rock mass classification - The participation of expert geologist is
very important as the primary support as well as the further designing
of supports etc during the excavation of rock requires the
classification of the rock mass.
• Dynamic Design – The deigning is dynamic during the tunnel
construction.Every face opening classification of rock is done and the
support are selected accordingly. Also the design is further reinforced
based on thedeformation as noiced during the monitoring.
Classification of Rock Mass type
Rock mass encountered during excavation cannot be said to be
favourable or unfavourable only on the basis of the type of the rock.. Several
other factors also play part in the rock mass behaviour. The excavation in the
rock is depenent on the rock class based on several factors such as –
compressive strength of rock, water condition, number of cleavages,
condition of cleavages , dip and stike of the rock etc.There are various
4. 4
approaches of classification of the rock mass and most predominantly are
RQD,RMR and Q factor of the rock mass.
Rock Quality Designation index (RQD)
The Rock Quality Designation index (RQD) was developed by Deere (Deere
et al 1967) to provide a quantitative estimate of rock mass quality from drill
core logs. RQD is defined as the percentage of intact core pieces longer than
100 mm (4 inches) in the total length of core. The core should be at least
NW size (54.7 mm or 2.15 inches in diameter) and should be drilled with a
double-tube core barrel.
RMR Value:
RMR value dends upon the following factors:
1. Uniaxial compressive strength of rock material.
2. Rock Quality Designation (RQD).
3. Spacing of discontinuities.
4. Condition of discontinuities.
5. Groundwater conditions.
6. Orientation of discontinuities.
Based on this the rock mass classification as per RMR is as under:
RMR
Value
100-81 80-61 60-41 41-20 <20
Rock Class I II III IV V
Description Very
Good
Good Fair Poor Very poor
5. 5
Q Factor:It depends on the following:
i) Block size
ii) Inter block shear
iii) Active stress
iv) Reduction for joint water flow
v) Presence of weakness zones
Q factor varies from 0.01 to 1000 i.e. from exceptionally poor rock to
exceptionally good rock
Components and Sequence of Execution in NATM
i) Sealing Shotcrete – Shotcrete 25-50mm generally( fig 4)
ii) Fixing of Lattice Girder – lattice girder is 3 Bars of steel
reinforcement placed at three corners of triangle with 8mm steel
bar for connection.Easy to handle comparison ofsteel ribs. (fig 5)
iii) Fixing of wire mash – generally used 6mm thick wires (fig 6 )
iv) Primary Lining with Shotcrete – In layers each not thicker than
150mm (fig 7)
v) Rock Bolting – discussed separately (fig 8)
vi) Pipe Forepoling – Used for crown support for next Excavation
cycle ( for Rock Class after III only) ( fig 6)
Note: Wire mesh is not used for Fibre Reinforced Shotcrete
6. 6
Face recently opened sealed with Shotcret (Figure 4)
Lattice Girder (Figure 5 )
Lattice Girder
Sealing Shotcrete
7. 7
Fixing of Wire Mesh and Pipe Roofing/Forepoling ( Figure 6)
Shotcreting with CIFA Robotic Arm (Figure 7)
Pipe
Forepoling
being done
Man controlling remote
of Shotcreting arm
Wire Mesh being
Placed
8. 8
Rock Bolting In Progress with Rocket Boomer
Figure 8
Rock Bolt being
placed
Pipe
Forepoling/roofing
9. 9
Rock Class Vis-à-vis Rock support system being used in Pir Panjal
Based on the studies the rock support is being provided for the various
rock class and then monitoring of the deformations are done. The typical
rock support system used in the construction of Pir Panjal tunnel T-80
connecting Banihal in Jammu region and Lower Munda(Gulab Bagh) on the
valley portion in USBRL project of N.Railway, being executed under
Design consultancy of Geoconsult and Rites JV, is as under:
Rock
Class I II III IV V VI VII VIII
Sealing
Shotcrete
Yes Yes Yes Yes Yes Yes Yes Yes
Forepole X X X Yes Yes Yes Yes Yes
Wire
Mesh
X X Yes 2 layer 2 layer 2 layer 2 layer 2 layer
Shotcrete
(mm)
50 100 150 250 300 300 300 300
Lattice
Girder
X X X Yes Yes Yes Yes Yes
Rock Bolt X Yes Yes Yes Yes Yes Yes Yes
10. 10
Excavation in Soft Ground/Poor Rock MassTunneling:
The excavation can progress in full face when the rock mass class is
excellent,very good,good and then depending upon the inferior rock mass
class the excavation can be resoted to heading , benching.
For further poorer and very poor class of rocks the excavtion can
further be divided into the sub-segments. Based on the studies Rabcewicz
(1965) proposed that the excavation face may be divided into small cells that
will help the ground stand until completion of the lining.
It is proposed that the excavation is carried out in six or more steps
depending on the size and the geometry of the tunnel. Figure 9 below
illustrates a typical main cross-sectional geometry for a NATM tunnel as
proposed by Rabcewicz. The Roman numbers indicate the excavation order
and sequence of excavation for working in soft ground. The first step is the
excavation of the top heading (I), leaving the central part to support tunnel
face. Primary lining (shotcrete) II is formed and followed by removing the
top central portion (III) subsequently excavation of left and right walls (IV)
and then step V & VI so on
Protection of Portal Face:
Especially in soft rocks and cracked rocks the face of the tunnel portal
should be secured nicely to avoid any fall out and closing the way of the
tunnel. The typical face development in T-80 is shown in figure 10.
12. 12
Types of Rock Bolts:
There are various types of the rock bolts may be used. Predominantly
following rock bolts are being are being used:
1) SN Type – Normal steel tor steel bars of dia 28mm and above
(generally used as 32mm) with cement grout, some time the resin
pouches can be used for better anchorage.
2) SDR – These are self drilling type of Rock bolts with sacrificial bit at
start, suitable for rapidly collapsing soils where the drilled hole
collapses when drill bite is withdrawn.
3) Expansion Rock Bolts – Swellex type. The rock bolt is inflated after
insertion with the water pressurefor better anchorage.
Allowances for Settlement and Construction:
It has been observed that if the allowances are not given for the
settlement or execution perfection then at later stage it may some time cause
problem in SOD especially in curves. Sometimes the speed considerations in
the tunnel are adversely effected. So during tunneling due allowance should
be taken into the consideration for the excavation for allowing the settlement
and construction tolerances to avoid any complication at the later stage.
Generally 100mm for construction and for settlement it depends on rock
mass classification..
Field Tests:
i) Testing of Aggregate grading
ii) Panel casting and core testing in Shotcrete.
iii) In Situ core testing of Shotcrete
13. 13
iv) Pull Out tests for the rock bolts
Machinery Used
Apart from the general machinery used in tunneling like
Excavators, loader, tippers following machines have advantage of using:
1. Boomer— it is a versatile machine having three arms machine.
Its two arms are used for drilling and one arm has the bucket for
the movement of the men for work. It is useful in fixing of Wire
gauge, Lattice Girder, Pipe Forepoling, rock bolting. For rock
bolting separate machine Tam Rock can also be used.
2. Shotcrete Machine with Robotic arm- This may be used for
spraying of shotcrete rather than manual spraying so as to avoid
human errors. This has already been shown in Fig 7
Three Arms of
Boomer
14. 14
Conclusion:
NATM approach of design and execution of the tunneling in varied
geology and especially in soft ground tunneling is advantageous and
scientific way of tunneling in comparison to the old /conventional way of
tunneling. This system monitors the rock mass deformation and designs the
support system with reference to the rock mass typeand deformation.
15. 15
Project Report
Use of NATM
(New Austrian Tunneling
Method)
In Tunneling
Rakesh Sabharwal
Dy CE/Doub/Jammu
Course No 823