Geotechnical Engineering
Disadvantages of Direct Shear Test
Disadvantages of direct shear test are in the following: 1. Failure of the sample occurs along a predetermined failure plane. The test sample is not allowed to fail along the weakest plane. 2. The test sample fails along the horizontal plane progressively. It starts from the edge and moves towards the center. So, the entire shear stress of the plane is not distribute…
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Geotechnical Engineering
Advantages of Direct Shear Test
The advantages of the direct shear test are many. They are given in the following: 1. Simple and cheap. 2. Test sample preparation is relatively easy for dry or saturated sandy soil. 3. Since sample thickness is kept small, quick drainage and rapid dissipation of excess pore water pressure can occur. 4. Both shear stress and normal stress can be measured directly on …
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Geotechnical Engineering
Factors Influencing Shear Strength Parameters of soil
Shear strength is a prime behavior of soil. Shear strength parameters are C and φ. Different factors are affecting the shear strength parameters of soil. They are given in the following: Drainage Condition: Drainage condition affects shear strength. In the Triaxial test apparatus, there are options for finding shear strength in both drained and undrained conditions.…
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Geotechnical Engineering
Significance of Atterberg Limits and Indices
Soil can be classified into four different categories based on its water content. These are solid, semi-solid, plastic, and liquid. The engineering properties changes in each state. Boundaries of these states can be defined as Liquid Limit, Plastic Limit, and Shrinkage Limit. They are called Atterberg Limits collectively. The importance of atterberg limits and indic…
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Geotechnical Engineering
Importance of Specific Gravity of Soil
Specific gravity is the r atio of the mass of a given volume of material at a temperature to the mass of an equal volume of distilled water at the same temperature. It is dimensionless and expresses ratio only. Standard Test Methods for Specific Gravity of Soil Solids by Water Pycnometer. The test is performed to determine the specific gravity of soil passing 4.7…
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Geotechnical Engineering
Importance of Particle Size Distribution Using Sieve Analysis
Soil particles have different sizes. The size of every particle cannot be specifically determined. But a size range can be determined which gives a notion about soil characteristics. Grain size analysis using the sieve analysis method is used to know the size ranges of particles. This test method is used for soil samples that pass through 3-in. (75-mm) sieve and ret…
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Geotechnical Engineering
Importance of Permeability of Soil in Civil Engineering
The importance of the coefficient of permeability of soil in Geotechnical Engineering is diverse. It is the characteristics of the soil to transmit water through its pores. Some important uses of permeability are discussed in the following Calculating seepage Rate of consolidation; settlement of structures Calculation of uplift pressure and piping Calculate seepage:…
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