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.
出处
《爆破》
CSCD
2008年第3期7-11,共5页
Blasting
基金
绵阳市科委资助项目
关键词
护壁爆破
数值模拟
护壁面方向
临空面方向
protecting borehole wall blasting
numerical simulation
direction of protecting borehole wall
direction of free-face
