不连续岩体的三维弹粘塑性复合单元模型研究

THREE DIMENSIONAL ELASTO-VISCOPLASTIC COMPOSITE ELEMENT MODEL FOR DISCONTINUOUS ROCK MASSES

阐述了复合单元法的原理,并在此基础上提出了针对不连续岩体的算法。该算法最突出的特点是每个复合单元可以含有几个不连续面,如断层或节理。该算法的主要优点是可以方便地整合到传统有限元分析程序中,且当结构中含有较多需在计算中离散处理的不连续面时,计算网格的生成不受不连续面的数量、位置和方向的影响。算例表明这种新方法是合理和有效的。

The principle of composite element method is illustrated, and an algorithm for jointed rock masses is implemented on the basis of the principle. The most remarkable feature of the algorithm is that each composite element may contain several discontinuity segments, such as faults and joints. The main advantages of the composite element method is that it can be incorporated into conventional finite element analysis procedure, and the mesh generation of the large-scale rock structures with considerable number of discontinuities, which require discrete treatment in the calculation, is not restricted by the number, position and orientation of the discontinuities. Comparison study between composite element method and conventional finite element method is carried out to show the validity and robustness of the new method.