Permeability is the property of a material that allows water or other fluids to pass through its pores and openings. Gravels have high permeability while stiff clays have very low permeability and can be considered impermeable. Water flow through soil can be laminar or turbulent; laminar flow is most common in soil mechanics problems. Permeability is measured using laboratory and field tests and is affected by factors like soil grain size, void ratio, properties of the fluid, and compaction/stress level.
This presentation includes Definition of Permeability, measurement of Permeability, Validity of Darcy's law, Darcy's Law, Methods of Finding Permeability, factors affecting permeability, Permeability of Stratified Soil
This presentation is all about Shear Strength of Soil and it's importance in Civil Engineering, application of shear strength, direct shear test, mohr's circle, mohr's coulomb, shear strength, triaxial shear test, unconfined compression test, vane shear test
This presentation includes Definition of Permeability, measurement of Permeability, Validity of Darcy's law, Darcy's Law, Methods of Finding Permeability, factors affecting permeability, Permeability of Stratified Soil
This presentation is all about Shear Strength of Soil and it's importance in Civil Engineering, application of shear strength, direct shear test, mohr's circle, mohr's coulomb, shear strength, triaxial shear test, unconfined compression test, vane shear test
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.
This presentation explains different methods of dewatering of ground water during construction works and suggests the suitability of particular method in particular context.
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.
These slides describes the permeability of soil in a very lucid manner. This has been posted specially for the students of Diploma and Degree Engineering courses.
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.
This presentation explains different methods of dewatering of ground water during construction works and suggests the suitability of particular method in particular context.
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.
These slides describes the permeability of soil in a very lucid manner. This has been posted specially for the students of Diploma and Degree Engineering courses.
1. Ground Water Occurrence
2. Types of Aquifers
3. Aquifer Parameters
4. Darcy’s Law
5. Measurement of Coefficient of Permeability of Soil
6. Types of Wells
7. Well Construction
8. Well Development
Engineering properties of soil comprises of physical properties, index properties, strength parameters (shear strength parameters), permeability characteristics, consolidation properties, modulus parameters, dynamic behavior etc. This module highlights most of the engineering properties of soils.
Artificial Reefs by Kuddle Life Foundation - May 2024punit537210
Situated in Pondicherry, India, Kuddle Life Foundation is a charitable, non-profit and non-governmental organization (NGO) dedicated to improving the living standards of coastal communities and simultaneously placing a strong emphasis on the protection of marine ecosystems.
One of the key areas we work in is Artificial Reefs. This presentation captures our journey so far and our learnings. We hope you get as excited about marine conservation and artificial reefs as we are.
Please visit our website: https://kuddlelife.org
Our Instagram channel:
@kuddlelifefoundation
Our Linkedin Page:
https://www.linkedin.com/company/kuddlelifefoundation/
and write to us if you have any questions:
info@kuddlelife.org
WRI’s brand new “Food Service Playbook for Promoting Sustainable Food Choices” gives food service operators the very latest strategies for creating dining environments that empower consumers to choose sustainable, plant-rich dishes. This research builds off our first guide for food service, now with industry experience and insights from nearly 350 academic trials.
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UNDERSTANDING WHAT GREEN WASHING IS!.pdfJulietMogola
Many companies today use green washing to lure the public into thinking they are conserving the environment but in real sense they are doing more harm. There have been such several cases from very big companies here in Kenya and also globally. This ranges from various sectors from manufacturing and goes to consumer products. Educating people on greenwashing will enable people to make better choices based on their analysis and not on what they see on marketing sites.
"Understanding the Carbon Cycle: Processes, Human Impacts, and Strategies for...MMariSelvam4
The carbon cycle is a critical component of Earth's environmental system, governing the movement and transformation of carbon through various reservoirs, including the atmosphere, oceans, soil, and living organisms. This complex cycle involves several key processes such as photosynthesis, respiration, decomposition, and carbon sequestration, each contributing to the regulation of carbon levels on the planet.
Human activities, particularly fossil fuel combustion and deforestation, have significantly altered the natural carbon cycle, leading to increased atmospheric carbon dioxide concentrations and driving climate change. Understanding the intricacies of the carbon cycle is essential for assessing the impacts of these changes and developing effective mitigation strategies.
By studying the carbon cycle, scientists can identify carbon sources and sinks, measure carbon fluxes, and predict future trends. This knowledge is crucial for crafting policies aimed at reducing carbon emissions, enhancing carbon storage, and promoting sustainable practices. The carbon cycle's interplay with climate systems, ecosystems, and human activities underscores its importance in maintaining a stable and healthy planet.
In-depth exploration of the carbon cycle reveals the delicate balance required to sustain life and the urgent need to address anthropogenic influences. Through research, education, and policy, we can work towards restoring equilibrium in the carbon cycle and ensuring a sustainable future for generations to come.
2. Permeability
Permeability is defined as the property of a porous
material which permits the passage of water (or other
fluids) through its interconnecting voids.
A material having continuous voids is called permeable.
Gravels are highly permeable while stiff clay is the least
permeable, and hence such a clay may be termed
impermeable for all practical purposes.
The flow of water through soils may either be a laminar flow
or a turbulent flow.
In laminar flow, each fluid particle travels along a definite
path which never crosses the path of any other particle.
In turbulent flow, the paths are irregular and twisting,
crossing and recrossing at random.
In most of the practical flow problems in soil mechanics, the
flow is laminar.
3. The average coefficient of permeability of natural
deposits Parallel to stratification is always greater than
that perpendicular to stratification
The study of seepage of water through soil is important
for the following engineering problems
1. Determination of rate of settlement of a saturated
compressible soil layer.
2. Calculation of seepage through the body of earth
dams, and stability of slopes.
3. Calculation of uplift pressure under hydraulic
structures and their safety against piping.
4. Ground water flow towards wells and drainage of soil.
4. Darcy`s law: for laminar flow conditions in a
saturated soil, the rate of flow or the discharge per
unit time is proportional to the hydraulic gradient.
permeability, is defined as the average velocity of
flow that will occur through the total crosssectional
area of soil under unit hydraulic gradient.
5. If a soil sample of length L and cross-sectional area A, is
subjected to differential water head of water, h1-h2, the
hydraulic gradient i will be equal to (h1-h2)/L
6. Poiseuille’s law of flow through capillary tube
The relationship governing the laminer flow of
water through capillary tube is known as
Poiseuille s law.
The factors affecting permeability are
Grain size
Voids ratio of the soil
Entrapped air and foreign-matter
Properties of the pore fluid
Structural arrangement of the soil particles
Adsorbed water in clayey soils
7. Effect of size and shape of
particle
Permeability varies approximately as the square
of the grain size. Since soils consist of many
different-sized grains, some specific grain size
has to be used for comparison.
Experiments on filter sands of particle size
between 0.1 and 3 mm, the permeability can be
expressed as
8. Grouting
Grout is usually a mixture of cement, sand, and
water or chemicals that are used to fill gaps. They
are used in repairing concrete cracks, filling
seams and gaps in tiles, gaps for sealing and
waterproofing, and for soil stabilization
The process of injecting fluids (i.e. grouts) into the
pores space of the soil, is called grouting
The permeability of the coarse-grained soils may
be reduced by grouting
The grouting increases the soil strength
9. Effect of properties of pore fluid
Permeability is directly proportional to the unit
weight of water and inversely proportional to its
viscosity.
Though the unit weight of water does not change
much with the change in temperature, there is
great variation in viscosity with temperature.
Coefficient of permeability of soil increases with
the increase in temperature
Hence, when other factors remain constant, the
effect of the property of water on the values of
permeability can be expressed as
Physical Property of permeant which influences
10. Effect of void ratio
When stress decreases void ratio, coefficients of
permeability and volume change decrease
11. Determination of coefficient of
permeability
Laboratory methods
(1) Constant head permeability test.
(2) Falling head permeability test.
Field methods
(1) Pumping-out tests.
(2) Pumping-in tests.
Indirect methods
(1) Computation from grain size or specific surface.
(2) Horizontal capillarity test.
(3) Consolidation test data.
12. Direct measurement of permeability of the
specieman at any stage of loading can be made
only in fixed ring type consolido meter
Falling head method is more suitable for the
determination of permeability of clayey soil