深埋软岩巷道层位优化布置研究

Study on Optimal Arrangement of Strata in Soft and Deep-buried Rock Roadway

为研究因层位不同而对大埋深软岩巷道产生的不同影响,以淮南某矿866风巷为工程背景,运用FLAC数值模拟软件设置留煤底、跟底和破底3个模拟方案,对不同方案下巷道围岩破坏情况、应力和应变进行模拟计算,并对计算结果进行分析。结果表明:巷道围岩的塑性破坏和剪切破坏几乎不受巷道层位布置的影响;围岩主应力主要分布在巷道两侧的底角处;计算得到围岩应力、应变的标准差中,只有水平压应力、水平变形量和垂直变形量的标准差大于0.1,其值分别为0.1671、0.3688和0.7692。分析对比计算结果,得出位移变化量是影响巷道层位选择的最大因素,留煤底是最佳巷道层位布置方案。

In order to study the different effects of different layers on soft rock roadway with large buried depth,taking 866 air roadway of a mine in Huainan as the engineering background,the FLAC numerical simulation software was used to set up three simulation schemes of coal retention bottom,heel bottom and broken bottom,and the surrounding rock failure,stress and strain of roadway under different schemes were simulated and calculated,and the calculation results were analyzed.The results show that the plastic failure and shear failure of surrounding rock are almost not affected by the arrangement of roadway layers.The principal stress of surrounding rock is mainly distributed at the foot of both sides of roadway.Among the calculated standard deviations of stress and strain of surrounding rock,only the standard deviations of horizontal compressive stress,horizontal deformation and vertical deformation are greater than 0.1,and their values are 0.1671,0.3688 and 0.7692.By analyzing and comparing the calculation results,it is concluded that the displacement variation is the biggest factor affecting the selection of roadway horizon,and the coal retention bottom is the best roadway horizon arrangement scheme.