Which of the following IS codes is referred for the determination of the shear strength of soil sample by direct shear test method?

Explanation:

The direct shear test method is an important procedure for determining the shear strength parameters of soil, which includes the cohesion and the angle of internal friction. The Indian Standard (IS) codes provide a comprehensive guideline for various testing methods in civil engineering, including soil testing.

Analyzing the Given Options

1. IS: 2720 (Part 13): (Correct Answer)

   • This part of IS: 2720 provides the method for determining the shear strength of soil by the direct shear test method.

2. IS: 2720 (Part 23): (Incorrect Answer)

   • This part of IS: 2720 deals with the methods for the determination of the calcium carbonate content in soil.

3. IS: 2720 (Part 30): (Incorrect Answer)

   • This part of IS: 2720 covers the method for the determination of dry density of soil in-place by the core-cutter method.

4. IS: 2720 (Part 12): (Incorrect Answer)

   • This part of IS: 2720 is used for the determination of shear strength parameters of soil using the triaxial compression test.