Sieve Analysis Essay

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Geotechnical tests for collected soil sample

Geotechnical characteristics of soil play an important role in finding characteristic parameters of unstable slopes and ultimately in the preventive measures of landslide hazard. Hence, the task of generating the reliable and accurate geotechnical data is of paramount importance for a construction manager working on unstable slopes.

The soil sample collected from selected active landslide zones is tested to investigate different geotechnical parameter. Some of the important tests are carried out as follows:

5.1.1 Water content of soil sample:

It is the ratio expressed as percentage of weight of water in given soil mass to the weight of solid particles.

The water content of soil is
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Table No. 5.2 - Observation table for specific gravity test

Result: Average Specific Gravity = 2.33

5.1.3 Particle size distribution (Sieve Analysis):

IS: 2720 (Part IV) – 1985 Method of test for soils: Part 4 Grain size analysis. ASTM D 422 Standard Test Method for Particle Size analysis of Soils.

Different types of soils show different stability properties so can be easily assessed that what type of landslide can occur in particular type of soil. Sometimes mixed regolith having small and large particles when come in contact with water acts like flowing concrete. When this type of soil is present at steep slopes the large volume of sliding and moving soil comes rapidly down may termed as mud flow, earth flow, and debris flow or debris avalanche too. When soil contains more fine particles then it is prone to mud flow under moderate rainfall and slump under heavy rainfall

Observations: 1) Total mass of soil = 2000gm.

2) Mass of soil retained on 4.75mm IS sieve = 305gm.

3) Mass of soil passing 4.75 mm IS sieve = 1552gm.

Table No.5 .3 Observation table for grain size distribution test:

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