地下洞库围岩外加固抗炸弹爆炸性能研究

 为进一步提高已建地下洞库的抗爆炸性能，本文提出了对洞库围岩采用交叉锚固进行加固的方法，并通过相似模型试验对加固前后的洞库模型进行了爆炸对比试验；在采用数值模型计算验证后，利用数值模拟的方法分析了锚索参数以及围岩强度对洞库抗炸弹爆炸性能的影响。研究结果表明：在相同的爆炸荷载作用下，加固围岩洞室衬砌结构的压力峰值、加速度峰值、拱顶位移峰值及整体破坏程度均小于未加固围岩洞室，加固围岩的爆腔体积、塑性区半径均较小，岩体内裂缝较少，爆点附近岩体耗散的爆炸能量较多；加固锚索面积越大、倾角越大、间距越小、长度越大、加固围岩材料强度越高时，洞室衬砌拱顶的位移响应峰值越小，且锚索角度的影响最大，围岩强度和锚索间距的影响其次，锚索面积和锚索长度的影响较小。论文研究可为地下防护工程设计和坑道围岩加固提供参考。

EXPLOSIVE RESISTIVITY RESEARCH ON ANCHORED CAVERN SURFACE ROCK

To improve the explosive resistivity of existing underground cavity，the surrounding rocks anchored by crossing cable method was proposed，and the effect of its were researched by model tests based on the theory of similarity. Then，based on the validity of numerical model was proved，the influence of anchor cable parameters and rock intensity on explosive resistivity were studied by numerical simulation. The work results show that the maximum pressure，maximum acceleration response，maximum displacement response and whole destruct extent of the underground cavity，which surrounding rocks anchored by crossing cable，are lower than those of conventional underground cavity under the same explosive load；meanwhile，the explosive cavity，semidiameter of plastic section and rock crevice of anchored rocks are smaller，the explosive energy dissipated by anchored rocks nearby burst point is bigger. The bigger anchor cable area，anchor cable angle and anchor cable length and the stronger rock mass intensity are，the less the structure vault displacement response is，while the effect of anchor cable interval is opposite. The first condition to improve the explosive resistivity of underground cavity is to increase the anchor cable angles，subsequently，to enhance the compression capacity of anchored rocks or to reduce the interval of anchor cable. Whereas，the impact of anchor cable area and anchor cable length upon explosive resistivity are feeble. The study can provide references to the design of protective projects and the reinforcement of the wall rock and tunnels.