摘要
针对含水巷道中地下水渗流对巷道围岩稳定性的影响,以云南某金属矿一巷道作为工程背景,基于流固耦合理论,应用正交实验与FLAC3D数值模拟相结合的方法,综合分析了含水巷道围岩稳定性影响因素(埋深、围岩强度和水压)的敏感性以及不同因素条件下巷道围岩的稳定性.研究结果表明:流固耦合作用下巷道顶板和两帮变形影响因素的敏感性顺序由大到小依次为埋深、水压、围岩强度.影响巷道顶板及两帮变形最小的组合为水压 0 MPa、围岩强度 80 MPa、埋深 200 m;最大的组合为水压 0.3 MPa、围岩强度 20 MPa、埋深 500 m.巷道两帮会受到孔隙水压力集中和压应力集中的共同影响,在巷道进行选择支护及加固方式时,可作为一定参考依据.
Abstract
This study investigates the influence of groundwater seepage on the stability of the peripheral rock of a water-bearing roadway.The sensitivity of the key factors(burial depth,peripheral rock strength,and water pressure)influencing the stability of the peripheral rock of the water-bearing roadway,as well as the stability of the peripheral rock under different factor conditions,were comprehensively analyzed based on the theory of fluid-solid coupling and the method of combining orthogonal experiments and numerical simulation with FLAC3D,taking a roadway in a metal mine in Yunnan Province as the background.The results showed that the sensitivity of the deformation factors of the roadway roof and two sidewalls under the effect of fluid-solid coupling was in descending order of burial depth,water pressure,and strength of surrounding rock.The smallest combination affecting the deformation of the roof and two sidewalls was water pressure of 0 MPa,perimeter rock strength of 80 MPa,depth of 200 m the largest combination was water pressure of 0.3 MPa,perimeter rock strength of 20 MPa,depth of 500 m.The two sidewalls of the roadway were affected by pore water pressure and compressive stress concentration,which could be used as a reference for selecting support and reinforcement methods in the roadway.
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