单孔单侧护壁爆破模型试验与数值模拟  

Model Test and Numerical Simulation for Single Hole-unilateral Protecting Borehole Wall Blasting

作　　者：肖定军[1] 郭学彬[1] 蒲传金[1] 刘一伟[1] 代仁平[1] 

机构地区：[1]西南科技大学环境与资源学院,四川绵阳621010

出　　处：《爆破》2008年第3期7-11,共5页Blasting

基　　金：绵阳市科委资助项目

摘　　要：对单孔单侧护壁爆破进行了砂浆模型试验,并对护壁面和临空面进行了动态应变测试,测试结果显示护壁面的应变峰值较临空面降低了44%;运用LS-DYNA3D有限元软件对该试验进行三维数值模拟,分析了炮孔周围介质的有效应力场、压力场、速度场及质点位移的发展和分布。结果表明:护壁面方向的压力、速度、位移的峰值分别较临空面方向降低了46%、43%、40%,并发生了不同程度的滞后,数值模拟结果与模型试验结果有很好的一致性。To study single hole-unilateral protecting borehole wall blasting,cement mortar model tests were carried out. Protecting borehole wall and free-face wall were tested of dynamic strain, the test results show that the peak of strain were reduced 44% on protecting borehole wall than on free-face wall. Three-dimensional numerical simulation of tests were made by using LS-DYNA3D. Development and distribution of effective stress ,pressure ,velocity near the hole were investigated. The present results indicate that the peak of pressure ,velocity and displacements were reduced 46% ,43% and 40% respectively on protecting borehole wall than on free-face wall and the time of pressure, velocity displacement reaching the peak was also delayed in varying degree. The simulation results were in good agreement with the experimental dates.

关 键 词：护壁爆破 数值模拟 护壁面方向 临空面方向 

分 类 号：TD235.46[矿业工程—矿井建设]