围岩外加固抗爆炸成坑试验研究

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。

Modeling test on explosion cavity to study anchored surface rock around cavern

The homogeneous，layered and block surrounding rocks anchored by crossing cables were studied in two groups of modeling tests to improve the explosive resistivity of country rocks. The macroscopic failure mode，the swelled shape，the distribution of cracks and the size of the explosion cavity of both reinforced and unreinforced surrounding rocks were studied. The research results showed that the crossing cables increased the tension strength and shear strength of rock，the explosive resistivity of country rocks was improved notably. The degree of model destruction was significantly influenced by rock characteristics. For the anchored rocks，the swelled height of the block models are bigger than the ones of homogeneous and layered models. The rock characteristics are the main factors affecting the crack distribution of the models. The size of explosion cavity of the homogeneous model anchored by the crossing cable is the smallest，of the block model is medium，and of the layered rock is the biggest.