爆炸冲击波下地应力对岩石裂纹扩展的影响  

Effect of in-situ stress on crack propagation in rock under blast wave

作　　者：李晓静[1] 韩雪瑞 张向阳 刘宇轩 LI Xiaojing;HAN Xuerui;ZHANG Xiangyang;LIU Yuxuan(School of Civil Engineering,Shandong Jianzhu University,Jinan 250101,China;Shandong Rail Transit Survey and Design Institute Co.,Ltd.,Jinan 250101,China)

机构地区：[1]山东建筑大学土木工程学院,山东济南250101 [2]山东轨道交通勘察设计院有限公司,山东济南250101

出　　处：《山东建筑大学学报》2024年第1期1-8,30,共9页Journal of Shandong Jianzhu University

基　　金：国家自然科学基金项目(51979156);青年泰山学者项目(tsqn202103087)。

摘　　要：随着地下工程深度的增加,地应力对爆炸引起的断裂影响不容忽视。为了探讨地应力大小和方向对岩体爆破的影响,文章以花岗岩为研究对象,通过有限元程序LS-DYNA和颗粒流程序(Particle Flow Code,PFC)相结合的爆破模拟方法研究了爆炸冲击波下地应力对岩石裂纹扩展的影响。结果表明:双轴等压应力对岩石近场裂纹的影响较小,而对远场裂纹发育有较大的抑制作用;单轴应力条件下,与应力垂直方向的压缩效应得到增强,而拉伸效应受到抑制,应力垂直方向的裂纹数量远小于平行方向的。With the increasing depth of underground engineering,the influence of ground stress on the drilling and blasting method can not be ignored.In order to explore the influence of the magnitude and direction of ground stress on rock blasting,firstly,the blasting simulation method coupled with finite element(LS-DYNA)and discrete element(Particle Flow Code,PFC)are compared with the blasting test.The effectiveness of this method for the study of blasting stress wave propagation and rock crack propagation is verified,then the effect of ground stress on rock blasting is studied by using this method.The results show that the biaxial stress has little influence on the near-field cracks of rock,but has a greater inhibitory influence on the far-field cracks.The compressive effect in the direction perpendicular to the stress is enhanced,while the tensile effect is suppressed,and the number of cracks in the direction perpendicular to the stress is much smaller than that in the direction parallel to the stress.According to the characteristics of blasting engineering,a new computer simulation technology is proposed in this paper,which can provide a reference for the study of dynamic evolution of mechanical behavior of deep rock mass under complex in-situ stress conditions.

关 键 词：岩体爆破 离散元 数值模拟 裂纹扩展 冲击波 

分 类 号：TD235[矿业工程—矿井建设]