地震荷载对巷道稳定性影响分析及控制技术
Effect Analysis of Seismic Load on Roadway Stability and Its Control Technology
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摘要: 通过对梁家煤矿煤4巷道在地震荷载作用下的FLAC3D数值模拟，揭示煤4巷道在开挖后，采用锚网索喷联合支护体系的支护方案，在地震荷载作用下引起的围岩应力场及位移场演化规律。结果表明：地震荷载对于煤4巷道围岩应力场及位移场影响比较大，相比之下对围岩位移场影响更大，尤其是对底板的影响；提出了把现有支护方案中的喷射普通混凝土，改为喷射橡胶颗粒混凝土，并在底板加入反底拱的支护方案。采用新的支护方案，地震荷载对巷道变形的影响得到了有力控制。Abstract: Based on FLAC3D numerical simulation for Liangjia Coal Mine No.4 roadway under earthquake load, we revealed the support scheme of adopting anchor net spray combined support system in No.4 coal tunnel after excavation, and the stress field and displacement field under earthquake load caused by the evolvement of surrounding rock. Numerical simulation results show that the influence of seismic load on coal roadway surrounding rock stress field and displacement field is bigger, more than the impact on the surrounding rock displacement field, especially the impact on the floor. We propose the existing support scheme of injecting ordinary concrete to instead of injecting rubber particle concrete, and joining the inverted-arch on the floor. Results show that the effect of seismic load on roadway deformation gets effective control.
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