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在结构–土体动力相互作用试验中,最常用的盛土容器是叠层剪切箱。在总结国内外剪切箱经验的基础上,研制出了刚度可调的二维叠层剪切箱,改进了箱体层间滑动装置。通过地震激励下模型土体试验,验证了该剪切箱很好的解决了单向水平地震输入时的边界效应,研究了土体在地震作用下的位移变化形态和非线性特征,得到了土体剪应力随地震动峰值的变化规律。结果表明:不同高度处土体的位移分布接近第一振型,土体剪应力和剪应力–剪应变滞回曲线的包络面积都随着地震动峰值的增大而增加,但是上下部土体的剪应力增加速率存在明显不同。
In the structural-soil dynamic interaction test, the most commonly used earth container is a laminated shear box. On the basis of summarizing the domestic and international experiences of shear box, a two-dimensional stacking shear box with adjustable stiffness was developed, and the box-level sliding device was improved. Through the model test of soil under seismic excitation, it is verified that the shear box can well solve the boundary effect when one-way horizontal seismic input, study the displacement change shape and nonlinear characteristics of the soil under earthquake, and obtain the soil. Body shear stress changes with the peak value of ground motion. The results show that the displacement distribution of the soil at different heights is close to the first mode shape, and the enveloping area of the soil shear stress and the shear stress-shear strain hysteresis curve increase with the increase of the peak value of the ground motion, but the upper and lower soils The body shear stress increase rate is significantly different.