Development of 2-D laminar shear box and shaking table tests on model soil
摘要
The laminar shear box is the most commonly used soil container in shaking table tests for soil-structure dynamic interaction. On the basis of the development experience of the worldwide shear boxes, the two-dimensional laminar shear box with adjustable stiffness is developed, and the interlayered sliding device is improved. Through the shaking table tests on model soil under earthquake, the boundary effect of shear box can be eliminated when the seismic load is applied to only one horizontal direction. The mode of vibration and nonlinear behaviors of soil are studied, and the relationship between soil shear stress and seismic peak is presented. The test results show that the distribution of displacements at different heights of soil is close to the first mode of vibration, and the shear stress of soil and the envelope area of shear stress-strain hysteretic loop increases with the increase of seismic peak, but the increase rate of shear stress at the top and bottom of soil is obviously different.