砂土的渐进破坏及其数值模拟

紧密砂土在排水剪切过程中由于材料的应变软化特性，会出现变形局部化并伴随剪切带的产生。对此类问题进行数值模拟时会遇到很多困难，比如如何模拟紧砂的应变软化特性，如何处理有限元数值分析过程中刚度矩阵的非正定导致计算结果发散问题，以及如何处理应力不连续的问题，拟针对以上问题进行了探讨。

Progressive failure of sand and its numerical simulation

It is well known that due to the strain softening behavior, the strain localization along with shear band formation will occur in the dense sand subjected to shearing under drained condition. In numerical simulation there are quite a lot of issues should be solved, such as how to simulate the strain softening behavior of dense sand and how to avoid the divergence problem in finite element analysis, and more over how to deal with the discontinuous of stress. The above mentioned issues are discussed in detail.