软岩巷道围岩控制技术

    Controlling Technology of Surrounding Rock in Soft Rock Roadway

    • 摘要: 为解决朱仙庄矿采用锚网喷+全封闭29U可缩支架支护巷道围岩变形量大、支护结构破坏严重的难题,提出了锚网喷+全封闭29U高强支架为核心的支护方案,并采用FLAC3D数值模拟软件对不同支护方式下的巷道围岩应力分布、位移和塑性区特征进行了对比分析。数值模拟结果显示锚网喷+全封闭29U高强支架支护巷道围岩应力集中区更靠近巷道中心,位移和塑性区范围均较小。工程实践表明,锚网初喷+全封闭29U高强支架支护巷道两帮收敛量和顶底板移近量的最大值分别为155 mm和270 mm,在矿压观测后期,巷道日变形量小于0.2 mm/d。

       

      Abstract: In order to solve the problem of large deformation of surrounding rock and serious failure of support structure of roadway with anchor net spray + 29U fully enclosed contractible stents support in Zhuxianzhuang Coal Mine, support plan of anchor net spray+29U fully enclosed high strength stents support is proposed. Characteristics of stress distribution, displacement and plastic zone of surrounding rock of roadway with two supports are analyzed and compared respectively by way of numerical simulation. The result shows that the stress concentration area of surrounding rock is closer to the roadway center; displacement and plastic zone is smaller than that of roadway with anchor net spray + 29U fully enclosed contractible stents support. The engineering application effect indicates the largest amount of convergence of two walls and roof to floor is 155 mm and 270 mm respectively, and the deformation is 0.2 mm/d in the later of mine pressure observation.

       

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