Analysis of the Elastic-Plastic Dynamic Finite Element on a Jointed Rock Mass

目的研究节理岩体的弹塑性动态本构关系，并进行数值模拟．方法考虑动荷作用过程中，应力随时间变化这一应力历史，取单元为分离体，根据静力平衡原则，求出与之相应的节点集中力，再计算节点位移，得到节理岩体弹塑性动态有限元方程．结果给出了一种节理岩体在动荷作用下的有限元分析方法．结论通过动态有限元分析，有效地解决了节理岩体在爆炸载荷作用下的大塑性变形问题，并对爆破范围进行了数值模拟。

Aim To study the elastic plastic dynamical constitutive relations about a jointed rock mass under explosion load and its computer simulation. Methods\ Stress history is taken into account and stresses will follow changes in time during a period of explosion load. According to the principle of static force balance, the corresponding nodal concentrated force is calculated and the nodal displacement is counted. The elastic plastic dynamic finite element equations are thus obtained. Results\ A finite element method is given for a jointed rock mass under explosion load. Conclusion\ The problem of large plastic deformation for jointed rock mass on blasting was efficiently resolved through dynamic finite element analysis and the range of damages by blasting simulated, and this pushes forward the problem to engineering practice.