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岩土工程中,土与结构的耦合作用通常导致土体产生极大变形,即大变形问题,如桩、桩靴和吸力锚的嵌入安装.传统有限元法在求解大变形问题时,网格将产生极大变形,导致计算误差很大,甚至不收敛.基于条形基础嵌入问题,对两种不同的大变形有限元法(网格重划分法和CEL法)进行对比分析.给出了两种大变形有限元法的实现流程,并分析了条形基础在均质各向同性和正常固结黏土中的嵌入问题,通过与条形基础承载力公式和RITSS大变形有限元法对比,验证了两种方法的有效性;通过用户子程序,模拟了正常固结黏土不排水抗剪强度随基础嵌入的变化规律;对比了条形基础嵌入过程中土体的流动机制.
In geotechnical engineering, the coupling between soil and structure usually leads to great deformation of soil, that is, large deformation problems such as pile, pile boots and suction anchor embedded installation.Traditional finite element method in solving large deformation problems, the grid Will produce great deformation, resulting in a large or even non-convergent calculation error.Based on the strip-based embedding problem, two different large deformation finite element method (mesh re-division method and CEL method) Two large deformation finite element method to achieve the process, and analysis of the strip foundation embedded in the homogeneous isotropic and normal consolidation of clay, through the strip foundation bearing capacity formula and RITSS big deformation finite element method contrast, The validity of the two methods is validated. The user subroutine is used to simulate the variation of undrained shear strength of embankment with embedment. The flow mechanism of soil under embedment of strip foundation is contrasted.