地下洞库围岩外加固抗炸弹侵彻性能研究

PENETRATION RESISTIVITY RESEARCH ON ANCHORED CAVERN SURFACE ROCK

通过相似模型试验研究交叉锚索对均质、层状和块状3种典型岩体加固前后的抗炸弹侵彻能力,试验结果表明,介质类型(均质、层状、块状)对侵彻深度影响不大,岩体质量越好,抗侵彻能力的提高量越小,在弹体动能相同的条件下,均质模拟岩体的侵彻深度最大,层状模拟岩体侵彻深度最小;分析弹体在加固模拟岩体与未加固模拟岩体内侵彻深度相差不大的根本原因,指出提高模拟岩体抗炸弹侵彻能力的首要条件是提高模拟岩体材料的抗压能力,在模拟岩体内配置的锚索含筋率较小时,虽然能够提高模拟岩体材料的抗拉强度,但对模拟岩体的抗炸弹侵彻能力没有明显改善;利用LS-DYNA软件对模型试验结果进行模拟计算,表明锚索角度和间距变化对加固岩体抗炸弹侵彻深度影响不大。尽管交叉锚索对模拟岩体的抗炸弹侵彻能力提高不大,但岩体材料的抗拉、抗剪能力的显著提高可明显减小洞库的变形,有利于洞库的稳定。

The penetration resistivity of the homogeneous, layered and massive surrounding rocks anchored by crossing cable are researched by model tests based on the theory of similarity. The experimental results show that the type of （homogeneous, layered and massive） surrounding rock has little influence on the penetration depth. The higher quality of rock mass, the less increasing quantity of penetration resistivity. The largest penetration depth of the massive model rock, the least penetration depth of layered surrounding rock. In this article, the basic reasons which lead the penetration depth smaller between reinforced and unreinforced model rocks are analyzed; and the first condition to improve the penetration resistivity of model rocks is to improve the compression capacity of model rocks. The simulated rock mass containing lower rate of cable, though it can improve the simulation materials tensile strength, it fails to improve the bomb penetration ability of simulation rock mass. The results of the model tests are also simulated by LS-DYNA. The numerical simulation is in good agreement with the experimental results. The numerical simulations show that the change of angle and the space of anchors which influence on the penetration depth of rocks is small. Although the crossing cable fails to improve anti-bomb penetration of the simulated rock mass, the increase of the tensile strength and shearing capacity for material of rock mass can obviously reduce the deformation of the underground structure, conducive to the stability of the underground structure.