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针对金川矿山958中段出现的巷道破坏现象,运用理论分析、力学推导、数值计算、工程试验等方法,模拟不同侧压下巷道围岩变形过程,揭示围岩失稳机制及支护失效机理,探究高侧压巷道稳定控制对策,提出“拱梁联合支护”方案,完善锚固作用下“围岩承压拱”计算模式,构建“底板—桁架梁”力学模型,并通过解析微分控制方程进行支护参数反演。调查研究表明,巷道顶底板变形比重与侧压系数?呈非线性正相关,围岩受力状态及位移形变随?变化;高水平构造应力、骤变部位集中应力是低相对强度围岩失稳和高关联度支护体失效的主要诱因;兼顾局部和整体强度关系、改善不良应力状态、增强围岩承载能力为高侧压巷道稳定性控制的关键;锚杆应力维体与围岩相互作用形成承压拱可分消应力作用;底板桁架梁横撑底脚,减弱两帮向内收敛挤压趋势。监测结果显示,巷道变形速率减缓和变形幅度降低,整体稳定得到控制。
Aiming at the phenomenon of roadway destruction in the middle section of 958 Jinchuan Mine, the deformation process of surrounding rock under different lateral pressures was simulated by means of theoretical analysis, mechanical derivation, numerical calculation and engineering test to reveal the instability mechanism and failure mechanism of surrounding rock. The stability control measures of high side pressure roadway are put forward, the scheme of “joint support of arch and beam” is proposed, the calculation mode of “surrounding rock pressure-bearing arch” is improved and the “floor-truss beam” Derivation of Differential Control Equations to Support Parameter Inversion. The investigation shows that the deformation ratio of top and bottom floor of roadway is nonlinearly positive correlated with lateral pressure coefficient, and the stress state and displacement deformation of surrounding rock vary with time. The high level of tectonic stress and the concentrated stress of sudden change are the low relative strength of surrounding rock instability And the main cause of failure of the high correlation support body. It is the key to take into account the relationship between the local strength and the overall strength, to improve the state of poor stress and to enhance the bearing capacity of the surrounding rock, and to control the stability of the roadway with high lateral pressure. The formation of pressure arch can be sub-cancel the role of stress; floor truss girder cross-leg, weakening the convergence of the two inward squeeze trend. Monitoring results show that the deformation rate of the roadway slows down and the deformation amplitude decreases, and the overall stability is controlled.