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阐述了二维平面应变比奥固结理论及其具体的有限元格式,详细介绍了砂井地基的两类平面应变等效方法及其原理.结合江西城门山铜矿凤爪沟尾矿坝软基处理实践,采用了以修正剑桥本构关系为基础的渗流变形耦合模型对尾矿坝施工过程中的砂井地基固结情况进行了有限元数值模拟和预测,对有限元数值模拟结果进行了详细的分析,总结了砂井地基固结过程中的位移、孔隙水压力随时间的变化规律,并与现场监测结果进行了对比、分析.结果表明:实测期内,位移的模拟值及其发展规律与实测结果比较接近,本文所使用的有限元模拟方法可以用来预测砂井地基的固结过程.该数值分析对相类似的砂井地基软基处理工程实践具有一定的指导意义.
The two-dimensional plane strain ratio Austrian consolidation theory and its specific finite element method are expounded, and two kinds of plane strain equivalent method and principle of sand well foundation are introduced in detail.Combined with the Fengcailou tailing dam The soft foundation treatment practice is based on the modified Cambridge constitutive equation coupled with seepage deformation model to simulate and predict the consolidation of sand well foundation during the construction of tailings dam. The numerical simulation results of finite element method A detailed analysis is made to summarize the variation of displacement and pore water pressure over time in consolidation process of sand well foundation and to compare and analyze with the on-site monitoring results.The results show that during the measuring period, The law of development is close to the measured result, and the FEM simulation method used in this paper can be used to predict the consolidation process of sand foundation. This numerical analysis is of guiding significance for the similar practice of soft soil foundation treatment.