![]() ![]() The lateral splitting block can be effectively reduced by applying lateral stress. With the increase of lateral stress, the peak shear strength and peak normal displacement of the sandstone specimens also increase, and the lateral deformation is restrained. Under different lateral stresses, a series of direct shear tests were conducted on the sandstone specimens, and the test results verify the reliability and practicability of the novel laboratory shear box. The lateral deformation measurement adopts a U-shaped sensor design, which solves the problem of the lateral deformation measurement. The new normal linear variable differential transformer (LVDT) sensor fixture is used to make the obtained normal deformation data more accurate. In this paper, a shear box is presented that can be used for the direct shear test of hard rocks under three-dimensional stress conditions with a true triaxial compression testing apparatus. If the properties of the intact rock have to be determined, triaxial or half-half notched specimen tests should be used. In case of cohesive soil drainage time will be more and there is no control over drainage as in case of triaxial test hence it is suitable for sandy soils. Conducting shear tests of rocks in the laboratory is an effective research method. Direct shear test is useful when cohesionless soil are to be tested. Shear failure is a typical failure mode of rock masses in underground engineering.
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June 2023
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