论文部分内容阅读
针对深部穿层巷道围岩非对称变形破坏特征,对其破坏机理及控制对策进行了数值分析和工程试验研究。结果表明,受埋深大、高地应力,特别是水平构造应力的影响,原支护下巷道围岩出现了非对称大变形破坏,穿层巷道断面与岩层倾向成钝角部位表现出最先破坏的关键部位特点;非对称破坏主要表现为围岩结构的非对称性影响下产生的不同岩层间的剪切滑移变形及高应力作用下的软弱岩层挤出变形等错位变形。结合现场工程地质条件,提出了锚网索+底角锚杆的非对称耦合支护对策,对关键部位进行了加强支护,有效地遏制了围岩的非对称变形,消除了巷道围岩的错位变形,提高了巷道围岩整体稳定性,现场应用效果良好。
Aiming at the asymmetric deformation and failure of surrounding rock in deep strata, the failure mechanism and control measures of the surrounding rock are numerically analyzed and the engineering test is carried out. The results show that under the influence of deep burial depth, high ground stress, especially the horizontal tectonic stress, the surrounding rock of the original roadway appears asymmetric large deformation failure, and the cross-section of the tunnel and the inclination of the strata show an obtuse angle at the obtuse angle The main features of the asymmetric failure are the shear-slip deformation between different rock layers under the influence of the asymmetry of the surrounding rock structure and the dislocation deformation such as the extrusion deformation of the soft rock under the high stress. Combined with the engineering geological conditions in the field, the asymmetric coupling support measures of anchor net + bottom corner anchor are put forward, and the key parts are reinforced and supported to effectively restrain the asymmetrical deformation of surrounding rock and eliminate the surrounding rock Dislocation deformation, improve the overall stability of roadway surrounding rock, field application effect is good.