Research on Mechanical Properties of Different Clay Based on Direct Shear Test
In order to research the soil quality of the stratum where a bridge is located,the mechanical properties of three kinds of clay(black clay,yellow clay and red clay)extracted from the stratum were studied by direct shear test.The results show that the shear strength of three kinds of clay increases with the increase of normal stress,and the arch shear planes of the three soil samples become more and more obvious with the increase of normal stress.Under the same normal pressure,the cohesion of yel-low clay is the highest,black clay is the second,and red clay is the smallest.In terms of internal friction angle,there is no signifi-cant difference between yellow clay and black clay,but they are all larger than red clay.When the soil moisture content is the same,the shear strength of yellow clay is the largest,followed by black clay,followed by red clay,and the best moisture content of the three kinds of clay is 13%.Under the optimum moisture content,when the normal pressure is the same,the shear stress of the three soil samples increases with the increase of shear displacement,and then gradually decreases and stabilizes in the residual strength after reaching the maximum value.
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