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为进一步提升洞库围岩的抗爆炸性能,采用相似模型试验方法对采用交叉锚索进行加固的均质、层状和块状围岩进行2组爆炸成坑试验,并对比分析加固前后围岩模型的宏观破坏形态、隆起形态、裂缝形态及爆坑尺寸。研究结果表明:(1)交叉锚索对岩体提供了较大的抗拉、抗剪能力,从而对岩体抗爆炸成坑具有较强的加固作用;(2)岩体特征对成坑试件破坏程度有较大影响;(3)从有加固的试件表面隆起高度上看,均质和层状岩体试件的都较小,块状岩体试件的较大;(4)岩体特征不同,试件表面的裂缝形态不同;(5)有加固试件的爆坑平面尺寸均质岩体试件的最小,块状的较大,层状的最大。研究结果可为地下防护工程设计和坑道围岩加固提供参考。
In order to further improve the anti-explosion performance of surrounding rock of caverns, two groups of explosions into pits were tested by using the similar model test method for homogeneous, layered and massive surrounding rock reinforced by cross-anchor cables. The surrounding rock before and after reinforcement The macroscopic failure mode, the uplift mode, the crack shape and the pit size of the model. The results show that: (1) The cross-anchor cable provides a large tensile and shear resistance to the rock mass, thus strengthening the anti-explosion pits; (2) (3) From the surface uplift height of the reinforced specimen, the homogeneous and stratiform rock specimens are smaller and the massive rock specimens are larger; (4) The characteristics of rock mass are different, and the fractures on the surface of the specimen are different. (5) The minimum size of rock mass in homogeneous rock mass with the cracked pits of the strengthened specimens is larger and the maximum of the strata is larger. The results of this study can provide references for the design of underground protection engineering and reinforcement of tunnel surrounding rock.