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为了合理考虑软黏土发生强度弱化的循环软化效应,将软黏土循环强度概念与不排水条件下邓肯-张非线性弹性关系与Mises屈服准则相结合,提出非线性弹塑性-循环强度模型。进而对于循环复合加载条件下裙板式基础的稳定性以及动静耦合现象进行有限元模拟,并与已有的模型试验及计算结果进行比较。结果表明:裙板式基础下地基所承受的峰值动荷载相对于其极限承载力有较大降低,不考虑土体屈服前非线性弹性所得到的峰值动荷载偏高。当基础所受的静荷载较小时,地基破坏主要由循环荷载引起,而当基础所受的静荷载较大时,地基破坏主要由静荷载引起。
In order to reasonably consider the cyclic softening effect of weakening of soft clay, a nonlinear elasto-plastic-cyclic strength model is proposed by combining the concept of cyclic strength of soft clay with the Duncan-Chang nonlinear elastic relationship and the Mises yield criterion under undrained conditions. Then the stability of the apron foundation and the coupled dynamic and static phenomena under the cyclic loading condition are simulated by finite element method and compared with the existing model tests and calculation results. The results show that the peak dynamic load of foundation under apron foundation is greatly reduced with respect to its ultimate bearing capacity, and the peak dynamic load obtained from the nonlinear elastic before soil yielding is not considered. When the static load on the foundation is small, the foundation damage is mainly caused by cyclic loading. When the static load on the foundation is large, the foundation destruction is mainly caused by the static load.