汶南煤矿跨采大巷围岩稳定性分析及控制技术研究.pdf

万方数据 论文题目论文题目 汶南煤矿跨采大巷围岩稳定性分析汶南煤矿跨采大巷围岩稳定性分析 及控制技术研究及控制技术研究 作者姓名作者姓名杨杨 方方 旭旭入学时间入学时间2015 年年 9 月月 专业名称专业名称矿业工程矿业工程研究方向研究方向矿矿山山压压力力与与岩岩层层控控制制 指导教师指导教师秦秦 忠忠 诚诚职职称称教教授授 副副指指导导教教师师范范 振振 忠忠职职称称研究员研究员 论文提交日期论文提交日期2018 年年 4 月月 论文答辩日期论文答辩日期2018 年年 5 月月 授予学位日期授予学位日期2018 年年 6 月月 万方数据 STUDY ON THE STABILITYANALYSISAND CONTROL TECHNOLOGY OFTHE SURROUNDING ROCK OF CROSS MINING ROADWAY IN WENCHAN COALMINE ADissertation ted in fulfillment of the requirements of the degree of MASTER OF ENGINEERING from Shandong University of Science and Technology by Yang Fangxu Supervisor Professor Qin Zhongcheng College of Mining and Safety Engineering June 2018 万方数据 万方数据 万方数据 万方数据 山东科技大学硕士学位论文摘要 I 摘摘要要 汶南煤矿主要生产巷道由于受到工作面跨采影响，巷道变形严重，围岩较 为破碎。为了解决汶南煤矿巷道支护困难的问题，本文针对跨采巷道围岩稳定 性及控制技术展开研究，提出了跨采巷道围岩联合控制技术、关键部位锚索加 固支护的方案，并应用于现场实践。论文的主要工作及结论如下 1以汶南煤矿 131109 工作面跨采-550m 水平大巷为研究背景， 结合跨采工 作面支承压力分布、煤层底板应力传递、巷道围岩塑性区分布及围岩变形分析 预测对跨采底板巷道围岩变形规律进行研究，发现跨采大巷围岩稳定性主要受 围岩内部因素与外部环境因素影响。 2运用 FLAC3D数值模拟软件，模拟了影响跨采巷道围岩稳定性的两个重 要因素，结果表明法向距离越小，底板巷道受工作面跨采影响越大，不利于 巷道维护。与跨采工作面法向距离为 30m 时布置底板巷道，围岩受力较小且易 于维护。水平距离为 10～20m 时，跨采巷道围岩应力达到最大，此时跨采巷道 容易发生破坏。水平距离为-24m 时，底板巷道处于工作面采空区卸压区域，受 采动影响较小，围岩塑性区最大深度减至 1m 以内，但巷道底鼓问题比较严重， 矿井应及时采取控底措施，防止巷道变形扩大。 3针对汶南煤矿生产巷道布置，提出了高强预应力防冲让压锚杆系统、关 键部位采用新型预应力笼形锚索加固的优化支护方案，采用“让压锚杆让压锚 索钢筋网钢筋梯喷浆”联合加固方式，经过现场实测，优化方案取得了较好 的支护效果。 该支护方案成功解决了汶南煤矿-550m 水平大巷变形严重的问题， 有效缓解了该矿采掘接替紧张局面， 为后续工作面的安全高效开采提供了保障， 并为类似条件的巷道支护提供了参考依据，推动了跨采巷道支护技术革新。 关键词关键词跨采；底板巷道；支承压力；采动影响；数值模拟 万方数据 山东科技大学硕士学位论文abstract II ABSTRACT The main production roadway of Wennan coal mine is seriously deed and the surrounding rock is broken because of the influence of cross-mining. In order to solve the difficult problem of roadway support in Wennan coal mine, this paper studies the stability and control technology of surrounding rock in span roadway, and puts forward the joint control technology of surrounding rock in cross mining roadway and the scheme of strengthening and supporting with anchor cable in key position, and applied to the field practice. The main work and conclusions are as follows 1Taking the horizontal roadway of 131109 face of Wennan coal mine as the research background, combined with the distribution of the supporting pressure in the cross mining face, the stress of coal seam floor is transmitted. The distribution of surrounding rock plastic zone and the analysis and prediction of surrounding rock deation in roadway are studied. It is found that the stability of surrounding rock in cross mining roadway is mainly affected by internal factors of surrounding rock and external environmental factors. 2Two important factors affecting the stability of surrounding rock of cross mining roadway are simulated by FLAC3Dnumerical simulation software. The results show that the smaller the normal distance, the greater the influence of cross mining on floor roadway, which is not conducive to the maintenance of roadway. When the normal distance from the working face is 30m, the floor roadway is arranged, and the surrounding rock is less stressed and easy to maintain. When the horizontal distance is 1020m, the stress of the surrounding rock of the cross mining roadway reaches the maximum. When the horizontal 万方数据 山东科技大学硕士学位论文abstract III distance is -24m, the floor roadway is at the pressure relief area in the goaf of the working face, which is less affected by the mining action, and the maximum depth of the plastic zone of the surrounding rock is reduced to less than 1m, but the problem of the roadway bottom drum is more serious. The mine should take the control measures in time to prevent the expansion of the roadway deation. 3In view of the layout of production roadway in Wenchan coal mine, the optimization support scheme of the high-strength prestressed anchor bolt system and the key position with the new prestressed cage anchorage cable is put forward. The combined reinforcement of “let pressure anchor pressure anchor reinforcement Net steel bar ladder jet grouting“ has been adopted, and the optimization scheme has achieved good support effect through field measurement.The support scheme successfully solved the problem of serious deation of -550m level roadway in Wenchan coal mine, effectively relieved the mining replacement tension in the mine, provided security for safe and efficient mining in the following working face, and provided reference basis for roadway support with similar conditions, and promoted the technical innovation of cross mining roadway support. Keywords cross-mining; floor roadway; support pressur; mining influence; numerical simulation 万方数据 山东科技大学硕士学位论文目录 IV 目目录录 摘摘要要.........................................................................................................I 目目录录......................................................................................................IV 1绪论绪论......................................................................................................................1 1.1选题的背景及意义.............................................................................................................1 1.2跨采巷道支护理论研究现状..........................................................................................1 1.3存在的问题..........................................................................................................................4 1.4研究的意义..........................................................................................................................4 1.5研究内容、方法、技术路线..........................................................................................5 2工程地质概况工程地质概况....................................................................................................7 2.1位置与交通..........................................................................................................................7 2.2生产建设情况.....................................................................................................................7 2.3工程概况及地质特征........................................................................................................8 3跨采底板巷道围岩变形规律研究跨采底板巷道围岩变形规律研究............................................................13 3.1跨采工作面支承压力分布规律...................................................................................13 3.2工作面煤层底板应力传递规律...................................................................................14 3.3跨采底板巷道自身稳定性分析...................................................................................15 3.4跨采巷道围岩塑性区分布规律...................................................................................16 3.5跨采巷道围岩变形分析与预测...................................................................................18 3.6本章小结.............................................................................................................................20 4跨采巷道矿压显现规律数值模拟研究跨采巷道矿压显现规律数值模拟研究...................................................22 4.1FLAC3D数值模拟简介...................................................................................................22 4.2数值模型建立...................................................................................................................22 4.3工作面跨采对-550m 水平大巷采动影响分析........................................................25 4.4跨采阶段原支护方案围岩变形分析..........................................................................32 4.5本章小结............................................................................................................................35 5支护优化与实测分析支护优化与实测分析...................................................................................37 万方数据 山东科技大学硕士学位论文目录 V 5.1巷道优化方案监测目的.................................................................................................37 5.2跨采巷道变形控制理论.................................................................................................37 5.3跨采巷道变形控制技术.................................................................................................40 5.4支护方案优化...................................................................................................................48 5.5-550m 水平大巷观测方案.............................................................................................52 5.6-550m 水平大巷支护优化后结果分析......................................................................54 5.7本章小结.............................................................................................................................61 6结论与展望结论与展望......................................................................................................62 6.1主要结论.............................................................................................................................62 6.2不足与展望........................................................................................................................63 参考文献参考文献.................................................................................................................65 致谢致谢..........................................................................................................................69 攻读硕士期间主要成果攻读硕士期间主要成果.....................................................................................70 万方数据 山东科技大学硕士学位论文Contents VI Contents ABSTRACT................................................................................................................II Contents.....................................................................................................................ⅥⅥ 1Introduction...........................................................................................................1 1.1The background and significance of the topic......................................................................... 1 1.2Research status on support theory of cross mining roadway...................................................1 1.3Existing problems.....................................................................................................................4 1.4The significance of research.....................................................................................................4 1.5Research content, and technical route.........................................................................5 2General situation of engineering geology............................................................7 2.1Position and traffic....................................................................................................................7 2.2Production and construction situation......................................................................................7 2.3Engineering general situation and geological characteristics..................................................8 3Study on the deation law of surrounding rock of cross mining floor.... 13 3.1Distribution law of support pressure in cross mining face.....................................................13 3.2Stress transfer law of coal seam floor in working face..........................................................14 3.3Stability analysis of roadway in cross mining floor...............................................................15 3.4Distribution law of plastic zone of surrounding rock in cross mining...................................16 3.5Analysis and prediction of surrounding rock deation in cross mining roadway............18 3.6Summary.................................................................................................................................20 4Numerical simulation study on the regularity of mine pressure in cross mining roadway.........................................................................................................22 4.1Abrief introduction to the numerical simulation of FLAC3D................................................ 22 4.2Numerical model establishment.............................................................................................22 4.3Influence of mining face on mining of -550m level roadway............................................... 25 4.4Analysis of the deation of the surrounding rock of the original support scheme in the cross mining stage........................................................................................................................... 32 4.5Summary.................................................................................................................................35 5Support optimization and measurement analysis............................................37 万方数据 山东科技大学硕士学位论文Contents VII 5.1Monitoring purpose of roadway optimization scheme.......................................................... 37 5.2Deation control theory of cross mining roadway...........................................................37 5.3Deation control technology of cross mining roadway................................................... 40 5.4Optimization of support scheme.............................................................................................48 5.5-550m horizontal tunnel observation scheme........................................................................ 52 5.6Analysis of the results of -550m level roadway support optimization.................................. 54 5.7Summary.................................................................................................................................61 6Conclusion and Prospect....................................................................................62 6.1Main conclusions....................................................................................................................62 6.2Deficiency and Prospect.........................................................................................................63 Reference................................................................................................................... 65 Thanks........................................................................................................................69 Major achievements in the study of masters degree.............................................70 万方数据 山东科技大学硕士学位论文绪论 1 1绪论绪论 1.1选题的背景及意义选题的背景及意义 煤炭对国民经济的重要性不言而喻，是工业快速发展必备的催化剂。我国 的煤炭地质储量十分丰富，消费比例自改革开放以来一直都占据着一次能源的 首位。经预测，到本世纪中叶煤炭在我国的战略地位仍不可撼动，作为我国经 济发展主要依赖的化石能源，煤炭不可再生，十分珍贵。 国内煤矿大部分采用井工开采，随着开采水平的不断延伸，浅部工程岩体 的力学特性逐渐减弱， 围岩受力后变形较为复杂， 松软破碎所占比重持续增加， 巷道变形量明显变大，底鼔严重，支护难度不小，巷道反复加固后仍很难维持 稳定，支护成本高，经济效益低。跨采巷道围岩变形复杂的现象，影响着矿井 的安全生产。因此，开展跨采巷道围岩稳定性分析及控制技术研究显得尤为重 要。如何减弱跨采巷道受到的采动影响，提高煤炭资源采出率，是此类巷道研 究的发展方向，这有助于形成跨采巷道围岩控制理论体系[1]。 本文针对跨采巷道围岩稳定性及控制技术进行研究，探讨围岩变形破坏规 律，为类似条件的巷道支护提供参考依据。以汶南煤矿-550m 水平运输大巷受 上覆 131109 工作面跨采为背景，通过理论分析、数值模拟、现场监测等研究方 法，结合跨采巷道稳定性影响因素及围岩应力传递规律进行研究。通过对矿井 原支护方案进行优化、调整支护方式与支护参数及对跨采巷道的关键部位进行 加强管理， 来减轻工作面跨采时所带来的采动影响， 提升巷道围岩自身稳定性， 保证跨采巷道的断面尺寸符合矿井安全生产要求。 1.2跨采巷道支护理论研究现状跨采巷道支护理论研究现状 现场实践表明， 跨采巷道受力较为复杂， 传统支护方式的作用效果不明显， 支护体阻力得不到有效发挥，巷道变形严重。国内外专家学者对跨采巷道围岩 稳定性分析作了大量的研究，相应的巷道支护理论也在不断完善，在工程实践 中应用效果较好，取得了较高的经济效益。 1国外研究现状 20 世纪初期，以 W.J.Rankine 为代表的古典压力理论应用较为广泛[2]，该 理论认为作用在