Sand direct shear test complete shear band measurement system and calculation method of shear strength

Abstract

The application is a complete shear band measurement system for sand direct shear test and a calculation method of shear strength, which can respectively perform shear test on samples under different normal stress, relative density and other conditions, and can realize visual dynamic monitoring by using the complete shear band measurement system for sand direct shear test, so as to obtain the mechanical properties and shear band deformation characteristics of the sample at the time of failure under different conditions, and calculate the shear strength index on the arc-shaped shear surface by curve fitting on the arc-shaped shear surface under different conditions, so as to realize the supplement of the test measurement value, which is beneficial to the in-depth research on complex soil in related research and engineering practice, and the establishment of a reasonable constitutive model. The visual dynamic monitoring can effectively offset the large displacement of the lower box in the pushing process, and obtain a clear and complete shear band image.

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