【摘要】 利用成本较低、可反复调整参数进行研究的数值模拟技术,运用ANSYS/LS-DYNA有限元程序,选择合适的材料模型及参数,在48 mm×48 mm的方形炮孔中进行等效不耦合系数分别为2.000,1.714,1.500,1.333,1.200,1.091和1.000的7组土体爆破压密模拟试验,以获得爆炸应力、爆腔半径以及压密效果的数值模拟结果,同时与其室外试验结果比较。研究表明,爆炸应力主要以水平方向传播,在条形装药段中部爆炸应力最大,端部最小;爆腔半径随着药卷尺寸增大逐渐增大;压密效果随着药卷尺寸增大呈现先增大后减小的变化趋势;数值模拟结果和室外试验结果基本一致,表明数值模拟技术可以应用于实际工程。更多还原

【Abstract】 By selecting suitable material models and parameters,and using numerical simulation technology with low cost and repeatable adjustment of parameters and finite element program ANSYS/LS-DYNA,seven groups of simulation tests of explosion compaction of soil,in which the decoupled charging coefficients of 48 mm×48 mm holes were respectively 2.000,1.714,1.500,1.333,1.200,1.091 and 1.000,were carried out,so as to obtain the explosion stress,blasting cavity radius as well as compaction effect of soil.The results of numerical simulation were compared with the results of outdoor experiments.The results of research showed that the propagation of explosion stress mainly was in horizontal direction;the maximum explosion stress was got in the central section of the bar charging,while the minimum explosion stress was in the ends of bar charging;the radius of blasting cavity increased with diameter of blasting cartridge increasing;the compaction effect first increased and then decreased with the diameter of blasting cartridge increasing.The results of numerical simulation were generally consistent with the ones of outdoor experiment,it showed numerical simulation technology can be applied in practical engineering.更多还原