Direct Shear Test Apparatus
Direct shear box apparatus for determining cohesion (c) and angle of internal friction (φ) of soils per IS 2720 (Part 13).
NABL TC-14144·
ISO/IEC 17025:2017·
Lab ID NKM/EQ-99
The Direct Shear Test Apparatus determines the shear strength parameters of soil — cohesion (c) and the angle of internal friction (φ) — by shearing a specimen along a predetermined horizontal plane under a range of normal loads. These parameters drive bearing-capacity, retaining-wall and slope-stability design. Testing follows IS 2720 (Part 13).
What this equipment tests
- Cohesion (c) of cohesive soils
- Angle of internal friction (φ)
- Shear strength under varying normal stress
- Consolidated & unconsolidated drained shear
Applicable Indian Standards
- IS 2720 (Part 13) — Direct shear test for soils
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Frequently asked questions
What does the direct shear test measure?
It measures the shear-strength parameters c and φ, which are used in foundation bearing capacity, earth-pressure and slope-stability calculations.
Which standard is followed?
IS 2720 (Part 13) — the Indian Standard method for the direct shear test on soils.