深基坑降水中不同的地质模型有限元应用研究

分析水-土耦合场相互作用时，将岩土视作弹塑性材料。在非线性本构关系下，考虑渗透作用，得出岩土体有限元方程，建立了基坑降水的三维水-土耦合的数学模型。对基坑降水中不同的地质模型潜水、承压水及有越流补给和实际工程条件井管、过滤管、止水帷幕分别进行了计算处理，并以武汉国际证券大厦降水工程为实例，对其降水过程进行了三维有限元计算。应用三维数值模拟方法，能很好地模拟基坑防渗帷幕、非均质和各向异性、承压-无压等一些解析法难以处理的实际工程条件和地质模型。

Study on finite elements applied to different geological models of foundation pit dewatering

As analyzing the interaction of water-soil coupling field, we take soil mass as elastoplastic material. Based on nonlinear constitutive relation, the finite element equation of rock considering seepage field can be obtained. The 3-D water-soil coupling mathematical model about dewatering of foundation pit is established; and the different geological model such as groundwater bearing bed, artesian aquifer water bearing bed and exceed flow alimentation artesian aquifer water bearing bed and every engineering condition such as embedded depth of filter tube and depth of stop water heavy curtain are calculated and treated. Taking the International Stock Exchange Hotel in Wuhan for example, the dewatering process of foundation pit is calculated by 3D finite elements. The three-dimension numerical simulation method can be applied to model impervious curtain, anisotropy and non-homogeneous, confined-unconfined water in practical engineering conditions and geological model, which are hard to solve in analytical method.