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修正剑桥模型是描述黏土弹塑性本构的重要临界状态模型。通过三轴应力路径剪切试验,给出了上海第5层黏土临界状态线斜率。通过K0固结压缩试验以及回弹试验,得到土体的压缩回弹对数体积模量。采用本文重塑土体参数以及原状土参数进行基坑开挖导致的土体位移有限元分析。结果表明,重塑土体参数较原有土体刚度有一定的减小,基坑坡顶位移及底部隆起采用重塑土体参数计算时,结果与原状土相比明显增大。
The modified Cambridge model is an important critical state model that describes the elastoplastic constitutive of clay. Through the triaxial stress path shear test, the slope of the critical layer of clay in the fifth layer of Shanghai is given. By K0 consolidation compression test and springback test, the compressive springback logarithm bulk modulus of soil is obtained. Finite element analysis of soil displacement caused by excavation of foundation pit is carried out by using the method of remolding the soil parameters and the undisturbed soil parameters. The results show that compared with the original soil, the parameters of the remodeled soil have a certain decrease compared with those of the original soil. When the displacement of the top of the foundation pit and the remnant of the bottom are calculated by the parameters of remodeled soil, the result is obviously larger than that of the undisturbed soil.