弱胶结软岩托顶煤巷道顶板锚固支护机理研究及应用

发布时间：2018-07-12 15:57

本文选题：弱胶结软岩 + 托顶煤巷道　；参考：《山东科技大学》2017年硕士论文

【摘要】：本文以红庆梁煤矿11301工作面回风顺槽为工程背景,采用室内试验、理论分析、数值模拟和现场监测相结合的方法,分析托顶煤巷道顶板变形破坏规律,揭示了针对弱胶结软岩托顶煤巷道顶板锚杆锚索作用机理,为托顶煤巷道支护优化设计提供理论依据。主要的研究内容及结论有:(1)通过室内试验,测得了 11301工作面顺槽顶煤及不同深度上覆泥岩力学参数,分析可知顶板近煤层泥岩与远煤层泥岩力学性质不同,结合岩石浸水试验分析得知该工作面托顶煤巷道顶板泥岩具有典型软岩特性,现场顶板钻孔电视探测发现,11301工作面托顶煤巷道顶板泥岩中下部层位出现离层,泥岩明显分层。(2)通过构建托顶煤巷道结构力学模型,给出了帮煤在水平应力作用下对顶煤产生弯矩的表达式,该弯矩削弱了垂直应力对顶煤的作用,表明弱胶结软岩托顶煤巷道顶煤对顶板稳定性具有促进作用。(3)根据顶板煤岩层受力状态分析,通过理论分析提出用煤梁与岩梁弹性模量比值作为顶煤与近煤层泥岩是否发生离层的依据,求得了考虑帮煤对顶煤弯矩作用下的顶煤与近煤层泥岩所受最大拉应力表达式,并以此作为顶板失稳破坏判据。(4)数值模拟研究表明,可通过调节顶板煤层厚度促进巷道顶板安全稳定,11301回风顺槽适宜顶煤厚度为1.5-1.75m。顶煤赋存稳定,且顶煤对巷道顶板稳定具有促进作用,提出适合于弱胶结软岩托顶煤巷道顶板锚固支护设计的“浅层加固梁”支护模型。(5)基于“浅层加固梁”支护模型研究分析,弱胶结软岩托顶煤巷道顶板锚杆主要作用为锚固顶煤与近煤层泥岩,使之成为加固梁,等效增加锚固体弹性模量,提高锚固体强度,为锚索支护提供稳定基础。依据该模型分析,对11301工作面顺槽支护方案进行优化,现场应用取得良好效果。
[Abstract]:In this paper, based on the engineering background of 11301 working face in Hongqingliang Coal Mine, the roof deformation and failure law of supporting top coal roadway is analyzed by means of laboratory test, theoretical analysis, numerical simulation and field monitoring. This paper reveals the mechanism of roof bolting cable in soft rock supporting roadway with weak cementation, which provides a theoretical basis for the optimum design of supporting and supporting of supporting coal roadway. The main research contents and conclusions are as follows: (1) through laboratory tests, the mechanical parameters of top coal and overlying mudstone with different depths in 11301 working face are measured, and the mechanical properties of mudstone near and far coal seam are analyzed. Combined with the analysis of rock immersion test, it is found that the roof mudstone of the supporting coal roadway in this working face has typical soft rock characteristics, and it is found that the middle and lower strata of the roof mudstone of the supporting top coal roadway appear in the middle and lower part of the top coal roadway in the working surface of Yushi 11301 working face by television detection of roof drilling. Mudstone is obviously stratified. (2) by constructing the structural mechanical model of supporting top coal roadway, the expression of bending moment of top coal under horizontal stress is given, which weakens the effect of vertical stress on top coal. The results show that the roof coal of soft rock supporting roadway can promote the stability of roof. (3) according to the analysis of the stress state of roof coal strata, Through theoretical analysis, the ratio of elastic modulus of coal beam to rock beam is used as the basis of whether the mudstone of top coal and near coal seam is separated or not, and the expression of maximum tensile stress of top coal and mudstone near coal seam under the action of bending moment of top coal is obtained. (4) numerical simulation study shows that the safe and stable roof of roadway can be promoted by adjusting the thickness of roof seam. The suitable thickness of top coal is 1.5-1.75 m. The occurrence of top coal is stable, and the top coal can promote the stability of roadway roof. A "shallow reinforcement beam" support model suitable for roof bolting design of soft rock supporting roadway with weak cemented soft rock is proposed. (5) based on the research and analysis of "shallow strengthened beam" support model, The main function of roof bolt in soft rock supporting roadway is to anchor the top coal and mudstone near coal seam, which makes it become a reinforced beam, increases the elastic modulus of anchor body, increases the strength of anchor body, and provides a stable foundation for anchor cable support. According to the model analysis, the supporting scheme of 11301 working face is optimized, and good results are obtained in the field application.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD353

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