Geotechnical Engineering
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What is the reference in standards for Optimum Moisture Content Range?
Neenu S K
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
See lessSoil Sample for Proctor Compaction Test
Madeh Izat Hamakareem
As per Is code 2720: 8 section 4.1.1, Sieve No.4 is used to check whether aggregation materials after they have been broken into individual particles. and only individual particles shall be retained on the sieve no. 4. So, sieve No. 4 is used to check whether the aggregation materials have been brokRead more
As per Is code 2720: 8 section 4.1.1, Sieve No.4 is used to check whether aggregation materials after they have been broken into individual particles. and only individual particles shall be retained on the sieve no. 4. So, sieve No. 4 is used to check whether the aggregation materials have been broken down properly or not.
Based on ASTM D698-00a, Sieve no. 4 used to determine the method of compaction test. This Standard provides three Method of testing namely Method A, Method B, and Method C.
Method A may be used if 20 % or less by mass of the material is retained on the No. 4 (4.75-mm) sieve.
Method B Shall be used if more than 20 % by mass of the material is retained on the No. 4 (4.75-mm) sieve and 20 % or less by mass of the material is retained on the 3⁄8-in. (9.5-mm) sieve.
Method C —Shall be used if more than 20 % by mass of the material is retained on the 3⁄8-in. (9.5-mm) sieve and less than 30 % by mass of the material is retained on the 3⁄4-in. (19.0-mm) sieve.
See lessWhat Factors Affects the Number of Boreholes and their Depths in Subsoil Investigation?
Madeh Izat Hamakareem
Number of Boreholes 1-Time allocated for investigations 2- Cost 3- The structure for which the investigation is conducted 4- and sometimes the availability of necessary equipment and individuals with adequate skills and experience. 5- Geological Conditions Borehole numbers are assumed to be economicRead more
Number of Boreholes
1-Time allocated for investigations
2- Cost
3- The structure for which the investigation is conducted
4- and sometimes the availability of necessary equipment and individuals with adequate skills and experience.
5- Geological Conditions
Borehole numbers are assumed to be economical unless their cost would not surpass the amount of savings in foundation cost. Otherwise it will increase the total cost of the project which is not desirable.
Determining Depth of Boreholes
The depth of boreholes is controlled by the depth of the soil that is under the influence of bearing pressure of the foundation. The recommended borehole depth is equal to one to three times the width of the loaded area. This is because it is suggested that bearing pressure below this depth would cause detrimental effect on the structure.
For Detailed Discussion please visit the following article:
https://test.theconstructor.org/geotechnical/setup-borehole-layout-site-investigation-foundations/18857/
See lessSwell Pressure Test on Soil and it’s Procedure
avinashm
Kinldy refer IS 2720: Part 41
Kinldy refer IS 2720: Part 41
See lessWhy we Conduct the SPT Test in Soil investigation?
avinashm
It provides information about Geotechnical properties of soil and furnishes data about resistance of the soils to penetration which can be used to evaluate standard strength data, such as N value of the soil. N = number of blows per 30 cm of penetration using standard split spoon. it is a procedureRead more
It provides information about Geotechnical properties of soil and furnishes data about resistance of the soils to penetration which can be used to evaluate standard strength data, such as N value of the soil.
N = number of blows per 30 cm of penetration using standard split spoon.
it is a procedure to obtain undisturbed samples at varying depths so that we can find cohesion, C and angle of internal friction, ???? which are used to find the bearing capacity of soils.
See lessWhat are the soil tests required for a 3 storey building?
Madeh Izat Hamakareem
Tests conducted for foundation of 3 storey buildings may change based on the type of soil on project site. Tests are commonly involves both field and laboratory which are discussed below: Field investigation Field investigation starts with the physical exploration to identify the presence of wet areRead more
Tests conducted for foundation of 3 storey buildings may change based on the type of soil on project site. Tests are commonly involves both field and laboratory which are discussed below:
See lessField investigation
Field investigation starts with the physical exploration to identify the presence of wet area, presence of plant trees or shrubs and presence of problematic soils like clay, which may call for detailed field studies. Depending on the resources available, either shallow profiles or boreholes are executed for further investigation.
Geotechnical site investigation consisted of open trial pits, coring and trial pit logging, in-situ water content, the weathering profile description and the collection of disturbed and undisturbed samples for laboratory tests.
Laboratory tests
1. Grain Size Distribution
2. In-Situ Moisture and Density Test
3. Atterberg Limits
4. Potential Swell Based on Tables and Charts
5. Swell Tests (Free swell test, Free swell in the oedometer)
6. X-Ray Diffraction (XRD) Microscopy
How to Measure Loads and Pressures on Geotechnical Structures?
Gopal Mishra
Please be specific about your question. Provide more details to get answers.
Please be specific about your question. Provide more details to get answers.
See less