拱顶端部加密锚杆支护洞室抗爆加固效果模型试验研究

Model tests on anti-explosion anchoring effect of tunnels reinforced by dense bolts at arch top

采用抗爆模型试验方法,研究了在集中装药爆炸应力波的作用下,拱顶端部加密锚杆支护洞室抗爆效果。通过分析压力时程曲线,证明测试数据规律性合理,数据可靠。分析和比较了拱顶端部加密锚杆支护洞室与不加密锚杆支护洞室所造成的洞室围岩拱顶位移、洞壁应变、顶底板加速度和洞室宏观破坏形态,得出拱顶端部加密锚杆支护洞室抗爆加固效果不佳。

The anti-explosion model test methods are adopted to study the anchoring effect of the tunnels reinforced by dense rock bolts at arch top under the explosive stress waves produced by focus charging. According to pressure temporal curves, it is proved that the test data are proper and reliable. For the purpose of the comparison of anchoring effects between the dense rock bolts at arch top and the common rock bolts, the differences of the arch vault displacement, the surface strain, the acceleration of roof and floor and the damage shape of the two underground openings are analyzed. The results show that the anchoring effect of dense bolts at arch top is not good.