A Research on The Shear Box Test

885 WordsJan 26, 20184 Pages
1.1 SCOPE The shear box test is an “angle of friction” test, in which one portion of soil is made up slide along another by the action of a steadily increasing horizontal shearing force, while a constant load is applied normal to the plane of movement. 2.1 INTRODUCTION Shear box is an instrument used in the geotechnical lab which measures the shear strength of a soil in a direct way and offers simple way to visualize what is happening to the soil. This is achieved by measuring the sliding resistance between the soil particles and thus the coefficient of direct sliding, C. The direct shear test is used to determine the shear strength of soils on a predetermined failure surface. This test is used to measure the shearing resistance, un-drained shear strength, and dilative and contractive tendencies in soils. The stresses set up in the soil cause deformation of the soil, which occur in three ways: By elastic deformation of the soil particle By change in volume of the soil resulting from expulsion of fluid By slippage of the soil particles, which lead on sliding 3.1 EQUIPMENT Figure 1 Shear box machine with electric motor and multi-speed driver unit, and load ring for measuring horizontal shear force. Shear box body into halves, Shear box carriage, watertight, running on roller bearing Loading pad, porous plates, perforated grid plate and retaining plate. Loading yoke, weight hanger and lever-arm, for applying the pressure to the specimen. Stop
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