在侧爆作用下锚固洞室抗爆加固效果研究

Research on Anti-explosion Anchored Effects of Reinforced Underground Openings under the Adjacent Blasting

为了给抗爆洞室的锚杆支护设计提供参考,利用数值分析软件LS-DYNA3D程序,研究了在侧爆作用下的锚固洞室的抗爆加固效果。结果表明:毛洞和锚固洞室裂纹分布比较相似,由于反射拉伸在侧墙附近形成了两个裂纹区;在侧墙附近形成的第一个裂纹区,毛洞形成的裂纹区比锚固洞室广、粗,而在第二裂纹区,锚固洞室的裂纹区比毛洞稍广、细;经过锚杆加固的洞室峰值位移减少1.1 mm,减小24.4%,说明锚固洞室具有较好的抗爆加固效果。

In order to give a reference for anti-explosion design of bolt support,based on LS-DYNA3 D software,the anti-explosion anchored effects of underground openings reinforced by rockbolts were studied under the adjacent blasting. The results showed that cracks ’ distribution of underground openings reinforced by rockbolts and underground openings without support were similar,and two zones of cracks were formed near to the sidewall by reflective tension. At the first zone of cracks,the cracks of underground openings without support are wider and thicker,and the cracks of underground openings reinforced by rockbolts are wider and thinner at the second zone of cracks. Compared with underground openings without support,the displacement at the radial direction of explosive source of underground openings reinforced by rockbolts was reduced by 1.1 mm and decreased by 24.4%,which indicated that the anti-explosion anchored effects of underground openings reinforced by rockbolts was better.