金鸡滩煤矿厚煤层开采双组土层采动隔水性演变规律(1).pdf

国家自然科学基金面上项目（51974291）资助 国家自然科学基金面上项目（51774268）资助 江苏省“333 工程”科研项目（BRA2019064）资助 硕士学位论文 金鸡滩煤矿厚煤层开采双组土层 采动隔水性演变规律 Research on Evolution Law of Mining- induced Water Resisting Property of the Two Groups of Clay Aquicludes in Thick Coal Seam Mining in Jinjitan Coal Mine 作 者赵 强 导 师张东升 教授 中国矿业大学 二○二○年五月 万方数据 学位论文使用授权声明 学位论文使用授权声明 本人完全了解中国矿业大学有关保留、 使用学位论文的规定，同意本人所撰 写的学位论文的使用授权按照学校的管理规定处理 作为申请学位的条件之一， 学位论文著作权拥有者须授权所在学校拥有学位 论文的部分使用权，即 ①学校档案馆和图书馆有权保留学位论文的纸质版和电 子版，可以使用影印、缩印或扫描等复制手段保存和汇编学位论文；②为教学和 科研目的， 学校档案馆和图书馆可以将公开的学位论文作为资料在档案馆、图书 馆等场所或在校园网上供校内师生阅读、浏览。另外，根据有关法规，同意中国 国家图书馆保存研究生学位论文。 （保密的学位论文在解密后适用本授权书） 。 万方数据 10290 中国矿业大学 硕士学位论文 金鸡滩煤矿厚煤层开采双组土层 采动隔水性演变规律 Research on Evolution Law of Mining-induced Water Resisting Property of the Two Groups of Clay Aquicludes in Thick Coal Seam Mining in Jinjitan Coal Mine 作 者 赵强 导 师 张东升 申请学位 工学硕士学位 培养单位 矿业工程学院 学科专业 采矿工程 研究方向 绿色开采 答辩委员会主席 姚强岭 评 阅 人 盲审 二○二○年五月 万方数据 致谢 致谢 时光是一张单程车票，三年的硕士求学生涯弥足珍贵回首望去，我已经在 矿大温暖的怀抱中渡过了本硕七年的时光，青春的欢快和洒脱与矿大“勤奋、求 实、进取、奉献”的优良校风一起流淌在我学习和生活的时光里 饮其流时思其源， 成吾学时念吾师。从大三专业课上认识导师张东升教授以 来， 老师以其博大精深的专业学识、 严谨求真的治学精神和大气磅礴的人格魅力， 潜移默化地为我树立起模范作用。正是在导师张东升教授的悉心指导、 鼓励及资 金支持下，本文得以顺利完成。在此，谨向导师张东升教授致以最高的敬意。 感谢范钢伟老师在撰写过程中所有细节的悉心指教 感谢张炜老师和顾伟老 师在研究生学业和生活上的的指导和鼓励感谢矿大所有为我传道、受业、解惑 的老师们 感谢实验室的张少华老师和宋万新老师在物理模拟试验中的帮助， 使试验得 以顺利完成 感谢金鸡滩煤矿的领导及工程技术人员给予的支持 感谢课题组的张帅博士、 池明波博士、 周亚洲博士、 范张磊博士、 蔚蔚博士、 梁帅帅博士、 张世忠博士、 陈铭威硕士、 凌斌硕士、 信连凯硕士等所有的师兄弟 感谢你们在日常的科研工作和学习生活上的激励和帮助。 感谢我的舍友们和同学们对我的帮助有幸在人生中遇到你们 感谢父母的生养之恩和多年的陪伴支持谁言寸草心，报得三春晖 真挚感谢本文所引用文献的作者们 感谢各位专家、学者在百忙之中评审本论文，殷切希望您的斧正和赐教。 写在最后是岁逢时疫，然万众一心，众志成城，八方统筹，同舟共济，更 有无双国士，最美逆行，舍生忘死，夙兴夜寐，美哉壮哉冬将尽，春可期，愿 山河无恙，人间皆安愿天佑中华繁荣昌盛 赵强 2020 年 5 月于镜湖 万方数据 I 摘 要 摘 要 FLAC3D-PFC3D 1 - 2 3 10016118 FLAC3D-PFC3D 万方数据 II Abstract The mining technology of Yushen mining area in Northern Shaanxi is superior, but the ecological environment is fragile, so it is necessary to practice the concept of water conservation mining. The structural stability and evolution law of the aquiclude under the influence of thick coal mining are directly related to the protection effect of aquifer water resources. Based on the geological characteristics of aquifer, aquiclude and overburden in Jinjitan coal mine, in this paper, theoretical analysis, 3D solid-liquid coupling physical simulation, FLAC3D-PFC3D numerical simulation and other s were used to study the meso damage and failure law of the soil samples of two groups of clay aquicludes and the evolution law of the mining-induced water resisting property of the two groups of clay aquicludes with different mining s under the thick coal seam mining. The main conclusions are as follows 1 The law of progressive damage and permeability change of soil samples in Baode laterite and Lishi loess layers during triaxial loading and unloading was studied. The deation, damage and failure of the structure, changes in porosity and permeability coefficient were analyzed from the meso-angles view of velocity field, displacement field, microcrack development, force chain field and bonding state of the particle system. It’s found that the volume strain of soil samples, the compactness of the particle system, and the porosity are mainly controlled by the confining pressure during loading and unloading. The change of soil sample permeability is controlled by both the pore structure and the fracture structure. The relational equation of soil volumetric strain-permeability coefficient was obtained by fitting. 2 A 3D solid-liquid coupled physical model was built to study the water level change characteristics of the surface aquifer on the two groups of clay aquicludes, and the evolution law of the deation, failure and water resisting property of the two groups of clay aquicludes in the process of layered mining of thick coal seams was revealed. The results show that In the process of upper layer mining, the overburden of the working face successively subsides and migrates from the bottom to the top, and the two groups of clay aquicludes produce cooperative deation and damage, but the overall structural stability is not damaged, and the water level of the aquifer is kept at a level. In the process of lower layer mining, the repeated mining disturbance aggravates the deation of the two groups of clay aquicludes, the amount of plastic damage and deation gradually accumulates, and the microcracks 万方数据 III gradually produce, develop, and penetrate, which leads to the overall structure instability of the two groups of clay aquicludes, the rapid decline of the water level of the aquifer and the loss of water resisting perance. 3 The influence of different mining s on the dynamic evolution of the mining-induced water resisting property in the two groups of clay aquicludes has been quantitatively studied. The damage degree of the two groups of clay aquicludes caused by different coal mining s is gradually slowed down, in the order of high mining height and fully mechanized mining, full thickness of fully mechanized top coal caving and large mining height and layered comprehensive mining. The mining-induced water resisting property of the loess layer is destroyed first, and the damage degree is far greater than that of the laterite layer. Nevertheless, the mining-induced water resisting property of the laterite layer remains good. The overall the mining-induced water resisting property distribution of the the two groups of clay aquicludes is divided into the initial permeability increase zone, the permeability increase zone of the upper soil layer, the permeability recovery zone, and the permeability increase zone of the lower soil layer. The paper has 100 picture, 16 table, and 118 reference. Keywords water conservation mining; clay layer; mining-induced water resisting property; fluid-solid coupling numerical simulation; FLAC3D-PFC3D coupling numerical simulation 万方数据 IV 目目 录录 ................................................................................................................................. I ...............................................................................................................................IV ............................................................................................................................VIII ............................................................................................................................. XV ...................................................................................................................XVI 1 .................................................................................................................................1 1.1 .........................................................................................................1 1.2 .........................................................................................................2 1.3 .........................................................................................................5 2 ...........................................................................................8 2.1 .....................................................................................................8 2.2 .................................................................................................. 10 2.3 ................................................................ 14 2.4 .............................................................................................. 16 2.5 .................................................................................................................. 17 3 ............................................... 19 3.1 ..................................................................................... 19 3.2 ........................................................ 25 3.3 ..................................................................... 35 3.3 .................................................................................................................. 40 4 ............................................... 42 4.1 ................................... 42 4.2 ............................... 44 4.3 ................................................................ 60 4.4 .................................................................................................................. 65 5 ............................................... 67 5.1 ................................................................ 67 5.2 ................................................ 76 5.3 ....................................... 85 5.4 ....................................... 92 万方数据 V 5.5 ..................................................................... 96 5.6 ................................................................................................................ 100 6 ................................................................................................................ 102 6.1 ................................................................................................................ 102 6.2 ............................................................................................................ 104 ........................................................................................................................ 105 ........................................................................................................................ 112 ................................................................................................... 114 ........................................................................................................... 115 万方数据 VI Contents Abstract ............................................................................................................................. II Contents ...........................................................................................................................VI List of Figures...............................................................................................................VIII List of Tables.................................................................................................................. XV List of Variables ...........................................................................................................XVI 1 Introduction....................................................................................................................1 1.1 Research Background and Significance......................................................................1 1.2 Research Status at Home and Abroad .........................................................................2 1.3 Research Contents and s .................................................................................5 2 Engineering Geological Characteristics of Jinjitan Coal Mine .............................8 2.1 Mine Engineering Geological Conditions ..................................................................8 2.2 Mine Hydrogeological Conditions ........................................................................... 10 2.3 Basic Mechanical Parameters and Hydraulic Parameters of the Two Groups of Clay Aquicludes ....................................................................................................................... 14 2.4 Mining Overview of Jinjitan Coal Mine .................................................................. 16 2.5 Chapter Summary...................................................................................................... 17 3 Gradual Damage Process and Permeability Change of Soil Samples under Triaxial Loading ............................................................................................................ 19 3.1 Establishment of Particle Flow Model for Soil Samples ........................................ 19 3.2 Analysis of Progressive Damage and Failure Process during Loading and Unloading of Soil Samples ................................................................................................................ 25 3.3 Variation of Permeability during Loading and Unloading of Soil Samples .......... 35 3.4 Chapter Summary...................................................................................................... 40 4 Evolution Law of Deation, Damage and Permeability of the Two Groups of Clay Aquicludes in Thick Coal Seam Mining ........................................................... 42 4.1 Common Law of Mining and Overburden movement and Failure Process and Instability of Clay Aquicludes ........................................................................................ 42 4.2 Dynamic Development Characteristics of Overlying Rock Fracture and Deation Law of the Two Groups of Clay Aquicludes during Thick Coal Seam Mining .............................................................................................................................. 44 万方数据 VII 4.3 Permeability evolution of the two groups of clay aquicludes in thick coal seam mining............................................................................................................................... 60 4.4 Chapter Summary...................................................................................................... 65 5 Effect of Mining s on Dynamic Evolution of Mining-induced Water Resisting Property in the Two Groups of Clay Aquicludes..................................... 67 5.1 Coal Mining s Analysis and Numerical Model Establishment and Verification....................................................................................................................... 67 5.2 Dynamic Evolution Law of Mining-induced Water Resisting Property in the Two Groups of Clay Aquicludes under the Influence of High Mining Height and Fully Mechanized Mining......................................................................................................... 76 5.3 Dynamic Evolution Law of Mining-induced Water Resisting Property in the Two Groups of Clay Aquicludes Under the Influence of Large Mining Height and Layered Comprehensive Mining ................................................................................................... 82 5.4 Dynamic Evolution Law of Mining-induced Water Resisting Property of the Two Groups of Clay Aquicludes under the Influence of Full Thickness of Fully Mechanized Top Coal Caving .............................................................................................................. 92 5.5 Dynamic Evolution Zoning of Mining-induced Water Resisting Property in the Two Groups of Clay Aquicludes .............