层状顶板煤巷均压补强支护设计及应用  

Equalizing Reinforcement Support Design and Application in Stratified Roof Roadway

作　　者：刘玉田[1] 韩强强[1] 庞涛[1] 何化栋 张书剑[1] 

机构地区：[1]中国矿业大学力学与建筑工程学院,江苏徐州221008

出　　处：《煤矿安全》2014年第3期139-141,共3页Safety in Coal Mines

基　　金：江苏省普通高校研究生科研创新计划资助项目(CXZZ12_0938);国家级大学生创新创业训练计划资助项目(201310290014)

摘　　要：以晋华宫矿2105巷为研究背景,建立了层状顶板力学模型,发现顶板最大拉应力与巷道宽度、煤帮承载宽度呈二次函数关系,与岩层厚度的二次方成反比,分析提出了层状顶板煤巷"均压补强"支护思想,消除围岩的集中应力,加强两帮的支护,减少巷道支护的短板效应为该类巷道支护的关键所在;基于上述思想对巷道进行了支护设计,数值模拟及现场实测结果表明,在锚杆预紧力的作用下,顶板形成了明显的组合梁结构,提高了顶板岩层的整体厚度,增强了稳定性;巷道开挖20 m后保持稳定,两帮收敛15.2 mm,顶板下沉7.9 mm,底鼓5.0 mm,效果良好。The article establishes the mechanical model for coal roadway with stratified roof base on 2105 roadway in Jinhnagong Mine, and finds that the maximum tensile stress of the roof and roadway width or carry width of coal side presents quadratic function, and in- versely proportional with the quadratic of bed thickness, puts forward the idea of equalizing reinforcement support for coal roadway with stratified roof, which eliminates the stress concentration of the surrounding rock, and reinforces the support of two sides, and reduces the short - board effect of the roadway that is very important to maintain the stability of the roadway. The results of numerical simulation and field measurement show that the roof forms a compression zone in the role of bolt preload, which improves the overall thickness of the roof strata and enhances its stability; roadway reaches steady state after excavation 20 m, and the convergence between two sides is 15.2 mm, roof and floor convergence are 7.9 mm and 5.0 mm, the support effects are fairly good.

关 键 词：层状顶板 力学模型 均压补强 支护设计 预紧力 

分 类 号：TD353[矿业工程—矿井建设]