洞室围岩交叉锚固结构抗爆性能模型试验研究

Model test study on explosive resistance of intercross bolted rock mass structure in underground space

为进一步提高已建成地下洞室的抗动载能力,本文提出围岩外交叉锚固的方法对洞室进行加固;随后利用相似理论建立了洞室外交叉锚固的试验模型,并对加固后的洞室模型进行了爆炸试验;通过采集分析影响洞室稳定性的拱顶位移、拱顶和底板部位的加速度参数,对比研究了外交叉锚固洞室的抗爆能力.通过模型爆炸试验得到：在相同爆炸荷载作用下,经过外交叉锚固加固后洞室的位移峰值和残余变形值均降低,处于爆点正下方的测点降低幅度范围约为20%-50%,洞室拱顶附近的加速度峰值降低幅度为20%左右,由此可见本文提出的外交叉锚固洞室的加固方法能够有效地提高洞室的抗爆性能.

In order to improve the explosive resistance ability of underground space, this paper uses the outer intercross bolted rock to reinfore the underground space structure, then the test model was built and he explosive resistance of mass structure was studied by model test, according to the data from explosive model test, outer intercross bolted rock mass structure is effective reduction on underground space relative displacement by 20 - 50 percent, and reduction acceleration by 20 percent, under the same explosive load. The model test results demonstrate that intercross bolted rock mass structure can enhance explosive resistance ability.