摘要
为研究不同地应力场对岩石爆破裂纹扩展效果的影响,利用ANSYS/LS-DYNA构建了多组二维数值模型,模拟了不同地应力条件下的岩体爆破过程,对比分析其破碎区及爆破裂纹形态差异情况,以及不同方向上各测点单元的切向应力时程曲线变化情况。结果表明:地应力在岩石的爆破过程中对岩石损伤具有抑制作用,裂纹会向着地应力最大的方向发展,且随着侧压系数的增大,裂纹差异越大;地应力对其爆破破碎区的形成有显著影响;随着地应力的增加,切向拉应力峰值逐渐减小,作用时间随之缩短。
To study the effect of different ground stress fields on the expansion effect of rock blasting cracks,multiple sets of two-dimensional numerical models are constructed using ANSYS/LS-DYNA.The rock mass blasting processes under different ground stress conditions are simulated,and the differences situation in its fracture zones and blasting crack morphology are compared and analyzed,as well as the changes situation in tangential stress time history curves of each measuring point unit in different directions.The results show that ground stress has a suppressive impact on rock damage during the rock blasting process,and cracks will develop towards the direction of maximum ground stress,and the difference in cracks will increase with the increase of lateral pressure coefficient;Ground stress has a significant impact on the formation of its blasting fragmentation zone;With the increase of ground stress,the peak value of tangential tensile stress gradually decreases and the action time shortens.
作者
俞海玲
牟海鹏
Yu Hailing;Mou Haipeng(Taishan University,Shandong Tai'an 272055;Shandong Jining Yunhe Mine Co.,Ltd.,Shandong Jining 272000)
出处
《山东煤炭科技》
2024年第2期122-125,131,共5页
Shandong Coal Science and Technology
关键词
地应力
岩石损伤
单孔爆破
数值模拟
ground stress
rock damage
single hole blasting
numerical simulation
