节理产状对隧道光面爆破成形效果的影响研究

摘要

Based on the project of a tunnel engineering in Jilin Province,the effect of joint attitude on formation under smooth surface blasting in tunnel was studied herein.By means of mechanism exploration,test analysis and ANSYS/LS-DYNA dynamic FEM numerical simulation,it is concluded that,when the angle between the close joint and the line of blastholes is more than 70°,the joint doesn't have obvious effect on the formation of smooth blasting;when the angle does not meet the criteria,the rock will fracture in the directions along and perpendicular to the joint surface,forming zigzag fault surface;when the angle is equal to 45°,this fault surface has largest degree of convex concave.%以吉林省某隧道工程为依托,研究了节理产状对隧道光面爆破成形效果的影响.通过机理研究、试验分析以及ANSYS/LS-DYNA动态有限元数值模拟三种方法的综合研究,得出当闭合型节理与炮孔连线夹角大于70°时,节理对光面爆破成形效果无明显影响,夹角不满足条件时,岩体将沿着节理面方向和垂直节理面方向发生破坏,形成之字形锯齿状断裂面,夹角等于45°时,断裂面凹凸度最大.