基床系数时间效应的三维分析

Three-dimension Analysis of Time-depending about Foundation Modulus

在绝大多数基坑设计中，基床系数Ｋ是一个重要的参数，一般通过现场试验确定．目前计算中常采用一固定不变的Ｋ值，而实际上挡土墙的变形是随着时间而增加的．对于这种情况，可以采用流变模型，但流变参数的获得较繁杂．现以金茂大厦基坑作为研究对象，采用充分考虑到空间效应的三维有限元计算方法，通过对实测水平位移的反分析。

While designing the retaining structure of foundation, the foundation modulus “ K ” is a very important parameter that is often decided on-the-spot test. At present, a fixed “ K ” is used in computation. But in fact, the displacement of the retaining wall increases as the time goes on. Concerning this kind of case, rheological model can be used, but rheological parameters are obtained complicatedly. This paper uses 3-dimension FEM to study Jin Mao Mansion and attempts to advance a new method by back analysis method.