DDA方法在台阶爆破仿真模拟中的应用

NUMERICAL SIMULATION OF BENCH BLASTING BY DISCONTINUOUS DEFORMATION ANALYSIS METHOD

采用非连续变形分析(DDA)方法对台阶爆破抛掷的全过程进行了模拟分析,给出了人工边界、爆破载荷的处理算法并编制了相应的DDA程序,计算结果较好地反映了节理岩体在爆生气体准静态作用下的破坏、移动的动力学过程以及爆堆的最后形成情况。

Based on the general principles of discontinuous deformation analysis (DDA) method, the numerical simulation is carried out on the overall movement process of rock breakage by blasting. The algorithm of transmitting boundary and the formula of explosion pressure upon expansion of blast chamber are derived and implemented to the original DDA code. The results of blasting simulation clearly showed the expansion of blasthole, initiation of failure and the subsequent kinematic process of jointed rock mass under applied explosion gas load.