In a direct shear test, the failure of the soil sample in shear is caused along a predetermined plane. Test is performed as per IS 2720 part XIII The normalload,strainand shearing force are measured directly during the test. It is also used to estimate residual stress of soil. The apparatus utilizes a square box divided horizontallyintotwohalves.Thebox containing the sample is placed in a water jacket and subjected to constant normal load while a horizontal force is applied till the specimen fails along the plane of juncture of the two halves

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