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Geotechnical Engineering

Home/Geotechnical Engineering/Page 6

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Asked: July 2, 2020In: Geotechnical Engineering

What is the purpose of applying a Geo Textile layer in ground improvement techniques?

Mangala Karunarathne
Mangala Karunarathne

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What is the purpose of applying a Geo Textile layer in ground improvement techniques?

  1. Kuldeep Singh

    Kuldeep Singh

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    Added an answer on July 3, 2020 at 10:51 pm

    Geotextile layers are a very comprehensive means of soil stabilization through reinforcement. The primary purpose is to provide tensile reinforcement just like steel does for concrete, so as to create a confining pressure in the soil to prevent slippage, caving, or any kind of soil deformation. OtheRead more

    Geotextile layers are a very comprehensive means of soil stabilization through reinforcement.

    The primary purpose is to provide tensile reinforcement just like steel does for concrete, so as to create a confining pressure in the soil to prevent slippage, caving, or any kind of soil deformation. Other than that, geotextiles can help achieve higher grades of compaction, easier and steeper slope stabilization, and check erosion.

    The mechanism is fairly similar to that of steel reinforcement in concrete. The geotextile layers are fairly good in resisting tension, and there is a great deal of friction between the soil and the geotextile. When soil is loaded vertically, it tends to bulge horizontally, but there exists a counteracting shear stress creating a reverse confining pressure in the soil and preventing deformations.

    Other than the above, geotextile layers have also been used to replace inclined retaining walls partially, subgrade stabilization and base reinforcement in roads, maintaining railway trackbed levels and geometry, preventing rainfall erosion isolation of base and subgrade of sports pitches and even reinforcement of retaining walls.

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Asked: February 1, 2020In: Geotechnical Engineering

Footing subjected to Biaxial Bending and uplift.

Biradar
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Dear Memebers, Has any one a Excel format to Design a Footing Subjected to Biaxial bending combined with uplift and pressure, in SI units. Regards Biradar

  1. Omprakash Dhawale

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    Omprakash Dhawale Beginner
    Added an answer on October 2, 2020 at 5:56 pm
    This answer was edited.

    Sir, Footing is the lowermost part of foundation. Footings are subjected to axial load and bending that can have a portion of their footing area that does not act in bearing. Generally, a direct method of proportioning a rectangular footing area subjected to biaxial bending is proposed as an alternaRead more

    Sir,

    Footing is the lowermost part of foundation.

    Footings are subjected to axial load and bending that can have a portion of their footing area that does not act in bearing.

    Generally, a direct method of proportioning a rectangular footing area subjected to biaxial bending is proposed as an alternative to the trial and error method of the given solution.  

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Asked: July 13, 2020In: Geotechnical Engineering

What is different between Prandtal mixing length and Boundarylayer ?

vivek gami
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What is different between Prandtal mixing length and Boundarylayer ?

  1. Vivek Patel

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    Added an answer on July 31, 2020 at 3:20 pm

    Prandtl mixing line theory is the phenomenon of momentum remaining constant in fluid flow where the boundary layer is a theory of variations of velocity perpendicular to the floor and velocity value change from 0 to infinite. Prandtl mixing theory is used for the study of momentum in fluid flow. BouRead more

    Prandtl mixing line theory is the phenomenon of momentum remaining constant in fluid flow where the boundary layer is a theory of variations of velocity perpendicular to the floor and velocity value change from 0 to infinite.

    Prandtl mixing theory is used for the study of momentum in fluid flow.

    Boundary layer theory is used for the study of velocity distributions in fluid flow.

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Asked: July 17, 2020In: Geotechnical Engineering

How to you know if the soil is organic or inorganic?

Pat Macko
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Hello, I’m currently studying for my FE Civil exam and going over Geotech material. When classifying soils using USCS, after you’ve determined the soil is a fine-grained soil, how can you know if the soil is organic or inorganic?

  1. Kuldeep Singh

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    Added an answer on July 19, 2020 at 12:49 pm

    There are a few parameters that you can use to judge whether a soil is organic or inorganic. Organic soils have fairly lower bulk densities than inorganic soils (0.2 to 0.3 as compared to 1.2 to 1.5). Organic soils will feel significantly lighter. Organic soils can retain way more water than inorganRead more

    There are a few parameters that you can use to judge whether a soil is organic or inorganic.

    Organic soils have fairly lower bulk densities than inorganic soils (0.2 to 0.3 as compared to 1.2 to 1.5). Organic soils will feel significantly lighter.

    Organic soils can retain way more water than inorganic soils (in proportions if their own densities).

    The color of organic soils is usually darker than inorganic soils. But this is not a good parameter for comparison since the color is affected by other things as well apart from organic nature.

    Cation exchange capacity (CEC) is higher in organic soils (4 times as that of inorganic soils). This means that organic soils will have a lower pH, higher exchangeable hydrogen, more calcium and magnesium ions, and higher exchangeable calcium content.

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Asked: February 5, 2020In: Geotechnical Engineering

What is the reference in standards for Optimum Moisture Content Range?

luqmanidaham
luqmanidaham

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Hi, With regards to your article (link: https://test.theconstructor.org/geotechnical/soil-maximum-dry-density-optimum-moisture-content/18426/), what is the reference in standards. I done check with BS 1377:1990 Part 4 ; but there is no statement saying the range of optimum moisture content for different soil type. If your author ...

  1. Neenu S K

    Neenu S K

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    Added an answer on February 9, 2020 at 11:50 pm

    The optimum moisture content of soil actually varies and a standard value for silt, clay, and sand is not strictly mentioned in most of the codes. The values mentioned in the article were based on the general laboratory test values based on Indian Standard Tests and Indian soil conditions. If my knoRead more

    The optimum moisture content of soil actually varies and a standard value for silt, clay, and sand is not strictly mentioned in most of the codes. The values mentioned in the article were based on the general laboratory test values based on Indian Standard Tests and Indian soil conditions.

    If my knowledge is right, we do mention the average moisture content value within a range.

    Thanks for your feedback and query

     

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Asked: July 15, 2020In: Geotechnical Engineering

What is the difference between black cotton soil and clay?

Jigar Chaudhari
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What is the difference between black cotton soil and clay?

  1. Abbas Khan Civil Engineer

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    Added an answer on July 16, 2020 at 2:51 pm

    Black Cotton soil ; Black Cotton Soil is a heavy clayey soil, varying from clay to loam.The black color in black cotton soil is due to the presence of Titanium Oxide in a little concentration. Generally, it is light to dark appearance. Found in central and southern parts of India. Clay SOIL; Clay soRead more

    Black Cotton soil ; Black Cotton Soil is a heavy clayey soil, varying from clay to loam.The black color in black cotton soil is due to the presence of Titanium Oxide in a little concentration. Generally, it is light to dark appearance. Found in central and southern parts of India.

    Clay SOIL; Clay soil is composed of very small fine particles and not much organic in nature. It contains clay minerals which, when get wet, develops plasticity. Clay minerals have hydrous Aluminium phyllosilicates.

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Asked: May 17, 2020In: Geotechnical Engineering

How Many Samples of Cores Required for Compaction Test of Backfill?

Fasi Ur Rahman
Fasi Ur Rahman

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An auditorium of size 42m x 25m is under construction, whose plinth is completed and backfilling is in process. The client has requested for compaction test of the backfill. The compaction test is carried out by the core cutting method. How ...

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