富水弱胶结软岩巷道围岩变形破坏特征分析

弱胶结软岩巷道围岩稳定控制是煤矿安全生产需要解决的一个技术难题。为研究弱胶结软岩巷道围岩的变形破坏特征以及合理的支护技术，以色连二矿12307巷道为研究背景，考虑采空区积水下渗对弱胶结软岩强度的影响，采用FLAC^3D对“锚杆索网”以及“钢筋网+全锚索+混凝土地坪”两种支护方案下弱胶结软岩巷道的应力、变形、塑性区等分布特征进行了数值模拟分析。研究结果表明，常规“锚杆索网”联合支护下富水弱胶结软岩巷道很难维持自身的稳定，其围岩变形量以及破坏范围将随着巷道的向前开挖而持续增长，最终在顶板、底板、两帮出现的最大位移分别为630、410、155 mm，而塑性区深度则可达5.9、4.0、6.0 m。而“钢筋网+全锚索+混凝土地坪”联合支护下，富水弱胶结软岩巷道则在巷道开挖后会迅速保持稳定，并且其在顶板、底板、两帮出现的最大位移分别为37.0、31.2、9.8 mm，塑性区深度仅为2.0、1.5、1.1 m。应用表明，采用“钢筋网+全锚索+混凝土地坪”联合支护能够有效控制富水弱胶结砂质泥岩的泥化现象，有利于巷道的掘进与使用安全。

Analysis on deformation and failure characteristics of surrounding rocks in water-rich roadway with weakly cemented soft rock

The stability control of surrounding rock in weakly cemented soft rock roadway is a technical problem to be solved in coal mine safety production.In order to study the deformation and failure characteristics of surrounding rock of weakly cemented soft rock roadway and reasonable support technology,taking 12307 roadway of Selian No.2 mine as the research background and considering the influence of ponding infiltration in goaf on the strength of weakly cemented soft rock,FLAC^3D is used to analyze the stress,deformation.The distribution characteristics of plastic zone are numerically simulated and analyzed.The research results show that it is difficult for the water rich and weakly cemented soft rock roadway under the combined support of conventional "bolt and cable net" to maintain its own stability,and its surrounding rock deformation and failure range will continue to increase with the forward excavation of the roadway.Finally,the maximum displacements in the roof,floor and two sides are 630,410 and 155 mm respectively,while the depth of plastic zone can reach 5.9,4.0 and 6.0 m.Under the combined support of "reinforcement mesh + full anchor cable + concrete floor",the water rich and weakly cemented soft rock roadway will quickly remain stable after roadway excavation,and its maximum displacement in roof,floor and two sides are 37.0,31.2 and 9.8 mm respectively,and the depth of plastic zone is only 2.0,1.5 and 1.1 m.The application shows that the combined support of "reinforcement mesh + full anchor cable + concrete floor" can effectively control the argillization of water rich and weakly cemented sandy mudstone,which is conducive to the excavation and use safety of roadway.