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为研究硐室群开挖顺序对围岩稳定性的影响,利用FLAC~(3D)有限差分计算软件,模拟分析赵庄矿皮带硐室群不同开挖顺序下围岩所产生的变形特性和应力特征,并提出相应的支护对策。研究表明:按不同顺序开挖硐室群会对硐室围岩的应力状态和塑性区范围产生不同程度的影响,以交叉开挖方式开挖,先开挖断面尺寸较小的硐室,对围岩稳定性影响较小。不同开挖顺序下硐室侧壁移近量普遍大于顶底板移近量,开挖造成的围岩应力扩散和叠加使巷道交叉处产生应力集中,对煤柱的整体稳定性影响显著。通过对最优开挖顺序下的围岩变形进行受力分析,选用合理支护方案,对硐室进行及时加固,经现场监测检验,加固效果良好。
In order to study the influence of the sequence of tunneling on the stability of surrounding rock, the deformation and stress of the surrounding rock under different excavation sequences in the belt chamber of Zhaozhuang Mine are simulated and analyzed by FLAC 3D finite difference software Characteristics, and put forward the corresponding support measures. The results show that excavation of the caverns in different orders will affect the stress state and the plastic zone of the surrounding rock to different extents. Excavation by cross excavation excavates the cavern with small cross-section, Surrounding rock stability less affected. Under the different excavation sequence, the displacement of sidewall of chamber is generally larger than that of roof and floor. The stress dispersion and superimposition of surrounding rock caused by excavation can cause stress concentration at the intersection of tunnels and significantly affect the overall stability of coal pillar. By analyzing the mechanical deformation of the surrounding rock under the optimal excavation sequence, the reasonable support scheme is selected to timely reinforce the chamber. After the on-site monitoring and inspection, the reinforcement effect is good.