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为研究锚固支护对钻爆法施工深部巷道围岩分区破裂的影响,采用深部巷道围岩破裂机制与支护技术模拟试验装置,开展高轴地应力条件下锚固支护深部巷道爆破开挖三维相似物理模型试验。爆破开挖、轴向超载完毕,模型巷道洞周围岩径向拉应变和径向压应力均呈现出波峰与波谷的波浪变化,与未支护模型巷道洞周径向拉应变变化规律相似,表明锚固支护模型巷道依然存在分区破裂的趋势。与未支护模型试验结果对比,锚杆和锚索联合支护的模型巷道在锚固支护部位未出现分区破裂现象,分析得出锚杆和锚索的联合作用可实现围岩应力的转移和重分布。研究结果表明,锚固支护对抑制深部巷道分区破裂具有重要的作用。
In order to study the influence of bolting and bolting on the regional rock burst in the deep roadway by drilling and blasting method, the deep rock roadway surrounding rock failure mechanism and supporting technology simulation test device are used to carry out the three-dimensional Similar physical model test. Blasting and excavation, the axial overloading is completed, the rock radial tensile strain and radial compressive stress around the tunnel show a wave of crests and troughs, which is similar to the radial tensile strain of the tunnel in the unsupported model, indicating Anchoring and supporting model roadway still has the trend of zoning rupture. Compared with the results of unsupported model test, the model roadway supported by anchor bolt and anchor cable did not show the phenomenon of zonal disintegration in the anchorage zone. It is concluded that the combined action of bolt and anchor cable can transfer the stress of surrounding rock and Redistribution. The results show that anchoring support plays an important role in suppressing the sub-zone rupture in deep roadways.