The document discusses types of vertical cuts for excavations including braced cuts. It describes braced cuts as excavations supported by bracing systems to minimize area and ensure stability. Various bracing systems are described including soldier beams, sheet piles, wales, and struts. Methods of designing different components of braced cuts like struts, sheet piles, and determining earth pressures and strut loads are also summarized.
Geotechnical Engineering-II [Lec #19: General Bearing Capacity Equation]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
Geotechnical Engineering-II [Lec #19: General Bearing Capacity Equation]Muhammad Irfan
Class notes of Geotechnical Engineering course I used to teach at UET Lahore. Feel free to download the slide show.
Anyone looking to modify these files and use them for their own teaching purposes can contact me directly to get hold of editable version.
A Designer's Introduction to the Development, Design and Application of Vinyl...Docks & Marinas, Inc.
This presentation is geared for designers of sheet pile walls. Synthetic materials are revolutionizing the way we build things. From the aerospace industry to nearly every aspect of our lives. Today this also includes sheet piles and round piles. Far lighter than steel, cheaper, easier to install, and non-corrosive, it has become the material of choice for many water's edge applications. ESP's vinyl sheet piling comes with a 50-year warranty. Its fiberglass composite with a 25-year warranty. Now used by the USACE, US Navy, at SuperFund sites to contain hazardous materials, and at many thousands of residential, commercial, and industrial applications around the world. Contact us for further details. Docks & Marinas, Inc.
Roen Salvage Company In situ Repair of Submerged Steel Sheet Pile WallsDocks & Marinas, Inc.
Roen is a marine contractor that has teamed up with Acotec NV in Belgium to use its proprietary and patented portable limpet cofferdam in the U.S. It is able to dewater the face of any SSP profile so a crew can do a thorough inspection of the wall in the dry, do the repairs and then coat the steel extending its service life at a cost far less than replacing the wall.
Now there is a better way to repair corroded and damaged walls while at the same time staying in operation to generate revenue.
SOIL-SHEET PILE INTERACTION - PART II: NUMERICAL ANALYSIS AND SIMULATIONIAEME Publication
This study investigates the interaction between soil and the embedded sheet pile wall at the interface which is not generally well captured in the conventional theoretical and design methods. This was implemented by carrying out numerical analysis to study the behavior and response of the
two contacting materials using incremental loading technique. The effects of the interaction were investigated in terms of deformations and stress distributions, all based on Finite Element technique. Numerical analyses of sheet pile wall embedded in homogenous and heterogeneous soil strata were
performedindependently. The results showed variation between the theoretical conventional design approach and that of the numerical analysis for both anchored and cantilevered sheet pile walls
This is useful for civil engineering students in their subject Building construction offered by GTU. This presentation includes Timbering of trenches, Scaffolding, Shoring 7 underpinning techniques used in construction of building for temporary period of time.
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
• The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate “any matter” at “any time” under House Rule X.
• The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
A Strategic Approach: GenAI in EducationPeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Honest Reviews of Tim Han LMA Course Program.pptxtimhan337
Personal development courses are widely available today, with each one promising life-changing outcomes. Tim Han’s Life Mastery Achievers (LMA) Course has drawn a lot of interest. In addition to offering my frank assessment of Success Insider’s LMA Course, this piece examines the course’s effects via a variety of Tim Han LMA course reviews and Success Insider comments.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
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Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Embracing GenAI - A Strategic ImperativePeter Windle
Artificial Intelligence (AI) technologies such as Generative AI, Image Generators and Large Language Models have had a dramatic impact on teaching, learning and assessment over the past 18 months. The most immediate threat AI posed was to Academic Integrity with Higher Education Institutes (HEIs) focusing their efforts on combating the use of GenAI in assessment. Guidelines were developed for staff and students, policies put in place too. Innovative educators have forged paths in the use of Generative AI for teaching, learning and assessments leading to pockets of transformation springing up across HEIs, often with little or no top-down guidance, support or direction.
This Gasta posits a strategic approach to integrating AI into HEIs to prepare staff, students and the curriculum for an evolving world and workplace. We will highlight the advantages of working with these technologies beyond the realm of teaching, learning and assessment by considering prompt engineering skills, industry impact, curriculum changes, and the need for staff upskilling. In contrast, not engaging strategically with Generative AI poses risks, including falling behind peers, missed opportunities and failing to ensure our graduates remain employable. The rapid evolution of AI technologies necessitates a proactive and strategic approach if we are to remain relevant.
Macroeconomics- Movie Location
This will be used as part of your Personal Professional Portfolio once graded.
Objective:
Prepare a presentation or a paper using research, basic comparative analysis, data organization and application of economic information. You will make an informed assessment of an economic climate outside of the United States to accomplish an entertainment industry objective.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
3. DEPTH OF UNSUPPORTED VERTICAL CUT The critical height ( H c ) of vertical cut without supports is two times Z o H c = 2 Zo where, Where, Z o is point of zero pressure Hence, Z o 2Z o 2 c K a
6. soldier beam is driven into the ground before excavation and is a vertical steel or timber beam. Laggings, which are horizontal timber planks, are placed between soldier beams as the excavation proceeds. When the excavation reaches the desired depth, wales and struts (horizontal steel beams) are installed. The struts are horizontal compression members. Type I use of soldier beams
7. interlocking sheet piles are driven in to the soil before excavation. Wales and struts are inserted immediately after excavation reaches the appropriate depth. Type II use of sheet piles
8. DIFFERENT TYPES OF SHEETING AND BRACING SYSTEMS The following types of sheeting and bracing systems for cuts are commonly used. Vertical Timber Sheeting: Vertical timber sheeting consisting of planks about 8 to 10 cm thick are driven around the boundary of the proposed excavation to some depth below the base of the excavation. The soil between the sheeting is then excavated. The sheeting is held in place by a system of wales and struts. The wales are horizontal beams running parallel to the excavation wall. The wales are supported by horizontal struts which extend from side to side of the excavation. However, if the excavations are relatively wide , it becomes economical to support the wales by inclined struts, known as rakers . For inclined struts to be successful, it is essential that the soil at the base of the excavation be strong enough to provide adequate reaction. If the soil can be temporarily support itself an excavation of limited depth without an external support, the timber sheeting can be installed in the open or in a partially completed excavation. Vertical timber sheetings are economical up to a depth of 4 to 6 m.
10. Steel Sheet Pile: In this method, the steel sheet piles are driven along the sides of the proposed excavation. As the soil is excavated from the enclosure, wales and struts are placed. The wales are made of steel. The struts may be of steel or wood. As the excavation progresses, another set of wales and struts is inserted. The process is continued till the excavation is complete. It is recommended that the sheet piles should be driven several meters below the bottom of excavation to prevent local heaves. If the width of a deep excavation is large, inclined bracing may be used.
11. Soldier Beams: Soldier beams are H-piles which are driven at a spacing of 1.5 to 2.5 m around the boundary of the proposed excavation. As the excavation proceeds, horizontal timber planks called laggings are placed between the soldier beams. When the excavation advances to a suitable depth, wales and struts are inserted. The lagging is properly wedged between the pile flanges or behind the back flange.
12. Tie Backs: In this method, no bracing in the form of struts or inclined rakers is provided. Therefore, there is no hindrance to the construction activity to be carried out inside the excavated area. The tie back is a rod or a cable connected to the sheeting or lagging on one side and anchored into soil (or rock) outside the excavation area. Inclined holes are drilled into the soil (or rock), and the hole is concreted. An enlargement or a bell is usually formed at the end of the hole. Each tie back is generally prestressed the depth of excavation is increased further to cope with the increased tension. Prestressed concrete is a method for overcoming the concrete's natural weakness in tension Having been stressed before use Methods of increasing the load bearing capacity of concrete by applying increased tension on steel tendons or bars inside a beam. ...
13. Use of Slurry Trenches: An alternative to use of sheeting and bracing system, which is being increasingly used these days, is the construction of slurry trenches around the area to be excavated and is kept filled with heavy, viscous slurry of a bentonite clay-water mixture. The slurry stabilizes the walls of the trench, and thus the excavation can be done without sheeting and bracing. Concrete is then placed through a tremie. Concrete displaces the slurry. Reinforcement can also be placed before concreting, if required. Generally, the exterior walls of the excavation are constructed in a slurry trench.
14. Design of Various Components of Bracing Struts: The strut is a compression member whose load-carrying capacity depends upon slenderness ratio, l/r. The effective length ‘l’ of the member can be reduced by providing vertical and horizontal supports at intermediate points. The load carried by a strut can be determined from the pressure envelope. The struts should have a minimum vertical spacing of about 2.5 m. In the case of braced cuts in clayey soils, the depth of the first strut below the ground surface should be less than the depth of tensile crack (Zc), which is equal to , While calculating the load carried by various struts, it is generally assumed that the sheet piles (or soldier beams) are hinged at all the strut levels expect for the top and bottom struts.
15. The reaction R 1 per unit length is determined by taking moments of the forces acting on span a d at d, and equating them to zero. Once R 1 has been determined, the reaction component R 2 ’ is determined from the equilibrium equation in the horizontal for the span a d. For sand For clay
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17. Sheet piles Sheet piles act as vertical plates supported at strut levels. The maximum bending moments in various sections such as ad, df and f h are determined. Once the maximum bending moments have been computed, the section modulus of the sheet pile can be computed and the section chosen.
18. Other Criteria for Design of Braced Cuts Braced cuts in clay may become unstable due to heaving of the bottom of the excavation. This is a type of bearing capacity failure and is discussed. Braced cuts is sand are generally stable against heaving failure but these may become unstable to upward seepage of water into the cut if the water level inside the cut is substantially lower than that outside. Piping failures is also one of the concern to be taken care of. The walls of the braced cut may yield laterally and cause ground settlement in the surrounding area. This effect should be carefully assessed and suitable measures adopted.
29. FOR DRY OR MOIST SAND FOR SOFT TO MEDIUM CLAY FOR STIFF CLAY EARTH PRESSURE DISTRIBUTION BEHIND SHEETING
30. Design of Braced Sheeting in Cuts Sheet piles are used to retain the sides of the cuts in sands and clays. The sheet piles are kept in position by wales and struts. The first brace location should not exceed the depth of the potential tension cracks. Since the formation of cracks will increase the lateral pressure against the sheeting and if the cracks are filled with water, the pressure will be increased even more. The sheeting of a cut is flexible and is restrained against deflection at the first series of struts. The deflection, therefore, is likely to be as shown in Fig. (a). The pressure distribution on sheet pile walls to retain sandy soil and clay soil are shown in Figs. (b) and (c) respectively. a b c
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32. This picture shows an internally braced cofferdam supporting a 35 foot deep excavation for a combined sewer overflow structure in Augusta, Maine.
34. Here you see a circular cofferdam that is supported by two cast in place concrete beams that behave much like an arched bridge or culvert. This 20 foot deep cofferdam was used to support an excavation for two clarifiers for a wastewater treatment plant in Bar Harbor, Maine. The circular design allows construction of the concrete clarifiers without interference from internal bracing.
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36. This photo shows a sewer excavation in San Francisco supported by a driven sheet pile wall, with pipe struts extending across the excavation. Wide flange beams distribute the loads of the pipe struts to the sheet pile walls. Because the struts are compression members, their capacities are controlled by considerations of buckling. Lateral supports reduce the effective lengths of the struts and increase their capacities.
37. This photo shows an excavation for the bay area rapid transit (BART) system, beneath Shattuck Avenue in Berkeley, California. Street traffic is carried on timbers that form a roof on the excavation, while construction of the cut-and-cover tunnel goes on beneath. The work area is very constricted by the horizontal H-beam struts and the vertical supports for the roadway over head.
38. Here the sheet pile wall around a building excavation is supported by pipe struts. Those in the foreground, which extend from one side of the excavation to the other, are termed “cross-lot” braces. In the corner of the excavation the sheet piles are supported by corner braces. Corner braces reduce the constriction in part of the working area.
39. This photo shows the excavation support system for a building in the Embarcadaro Center in San Francisco. The wall is a slurry trench concrete wall (a concrete wall constructed in a slurry-supported trench in the ground). The sides of the excavation are supported by external supports -- H-piles driven through holes in the wall, which work in tension to hold the wall. The use of external support greatly reduces the amount of congestion within the excavation, making construction faster and less costly. Corner braces support the corners of the excavation
40. Here the wall is supported by “rakers,” or inclined struts. The bottom ends of the rakers are braced against the central part of the building foundation slab. The excavation was carried to full depth at the center first so that the foundation slab could be poured. Prior to installation of the rakers, the lower part of the slurry trench concrete wall was supported by an earth berm. The earth berm remains at the far side of the excavation.
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43. The weathered rock at the bottom of the Getty Center excavation is stiff enough to support itself without lagging. At the corner braces are used
44. Work in progress on the new bulkhead with the tie anchors partially installed. Project Highlights Mass Maritime Academy Pier Facility Bourne, Massachusetts • Demolition of an existing wharf with timber piles and concrete deck.• Installation of a 350 foot long sheet-pile anchored bulkhead.• Installation of a new wharf structure (350 feet by 50 feet) supported on approximately 110, 16-inch diameter closed end pipe piles. The deck structure consisted of pre-cast concrete pile caps and deck with a finished cast in-place concrete surface.• Installation of new pre-cast concrete fender system.• Installation of new sewer line and pump station.• Installation of 2,000 tons of rip-rap bulkhead toe stabilization material.