孔庄煤矿7434工作面构筑物压煤覆岩隔离注浆充填开采方案研究.pdf

工程硕士专业学位论文 孔庄煤矿 7434 工作面构筑物压煤覆岩隔离 注浆充填开采方案研究 the Program Research of Isolated Overburden Grout Injection in KongZhuang Coal Mine 7434 Working Face 作 者李吉田 导 师许家林 教授 中国矿业大学 二〇一九年五月 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） 。 作者签名 导师签名 年 月 日 年 月 日 万方数据 中图分类号 TD325 学校代码 10290 UDC 622 密 级 公开 中国矿业大学 工程硕士专业学位论文 孔庄煤矿 7434 工作面构筑物压煤覆岩隔离注浆充 填开采方案研究 the Program Research of Isolated Overburden Grout Injection in KongZhuang Coal Mine 7434 Working Face 作 者 李吉田 导 师 许家林 申请学位 工学硕士专业学位 培养单位 矿业工程学院 学科专业 矿业工程 研究方向 岩层移动与绿色开采 答辩委员会主席 评 阅 人 二〇一九年五月 万方数据 致谢致谢 转眼研究生生涯已接近尾声，在中国矿业大学的学习日子里，我学到了很多 知识。特别地，我的导师许家林教授不仅在课程中指导我的学习，而且在实验和 模拟中为我指明了方向。在毕业论文的指导上，许家林老师更是一丝不苟，从论 文的选题、资料收集、论文的选读、实验的设计和安排、论文的撰写，许老师都 从忙碌中抽出时间进行教导，同时感谢课题组的各位老师的指导和帮助、师兄弟 们的帮助，没有他们论文是不可能如此顺利完成。值此论文完成之际，谨向许家 林老师致以崇高的敬意和衷心的感谢。 在论文的写作过程中，课题组的各位老师提出了许多宝贵建议，感谢各位师 兄弟在在数值模拟和沉陷预计中给予的无私帮助。感谢我的同学们，大家三年里 互相学习，互相帮助，我的学习生活中离不开你们的支持和帮助。 感谢一同在孔庄煤矿共事的诸位同事，感谢大家在工作中对我的帮助，大家 一起创造了良好的工作氛围。 感谢各位专家和老师在百忙之中评审本论文，并期待得到你们指导和启迪。 李吉田 二〇一九年五月 万方数据 I 摘摘 要要 覆岩隔离注浆充填技术在关键层支撑上覆岩层的情况下， 在工作面取合理采 宽，使之处于非充分采动状态，并在相邻工作面之间设置保护煤柱。开采中，在 关键层未破断时，通过地面钻孔高压将浆体注入覆岩离层中，在工作面中部形成 压实区，来控制地表破坏。该技术在实践中有效的控制地表沉陷，得到了广泛的 应用。本论文针对大屯煤电（集团）有限责任公司孔庄煤矿 7434 工作面被地面 钢厂压覆的实际，研究了钢厂压煤覆岩隔离注浆充填开采方案。 用数值模拟的方法模拟注浆条件下地表沉陷情况， 在此基础上设计注浆开采 方案。应用概率积分法分别对注浆充填开采和长壁直接开采进行地表沉陷预计。 7434 工作面走向长度 1235m，倾斜长度 197m，平均厚度 4.5m，属于单一煤 层开采，煤层条件适宜注浆。煤层埋深 793.8m～893.8m，上方有 7 层关键层。 孔庄煤矿地势平坦，水源充足，电力架设方便，距 5km 处有一座电厂可用来供 给粉煤灰。7434 工作面开切眼侧被地面一座钢厂所压覆盖，需要应用注浆充填 可以在保护钢厂的情况下，对其进行开采。所以 7434 工作面具备进行覆岩隔离 注浆充填开采可行性和必要性。 根据 7434 工作面的地质采矿情况与压煤情况，建立模型并进行注浆充填数 值模拟。得出注浆区域最大下沉量是 393mm；最大倾斜值是 1.66mm/m；最大水 平移动量范围是-177.5mm；最大水平变形量是-1.79mm/m。建筑物处于 I 级损坏 等级，注浆充填工程有效的控制了地表下沉。根据此结果，注浆层位设置于距煤 层顶板 150m 左右的第三层关键层。注浆压力设计为 8MPa。注浆充填材料采用 电厂粉煤灰， 浆体浓度需要达到 70。 需要采用开切眼侧压煤的钻孔布置方式进 行注浆。要按照双孔布置的方法设置钻孔。需要 5 个钻孔进行注浆，单个钻孔间 距 10～50m，钻孔组间距 100～200m。 与搬迁开采、 传统条带开采、 传统的离层注浆充填开采、 井下充填开采相比， 注浆充填开采吨煤充填成本低，煤炭采出率高，下沉系数小。充填系统的建设周 期短， 投资较小。 充填和采煤干扰较小。 更适合解决 7434 工作面钢厂压覆问题。 对 7434 工作面进行开采沉陷预计， 根据以往文献确定出地表移动计算参数。 沉陷预计分为长壁直接开采和注浆充填开采 2 种方案。 长壁直接开采后工作面正 上方处于 IV 级破坏，钢厂区域处于 II 级破坏；注浆充填开采后钢厂处于 I 级破 坏。 因此覆岩隔离注浆充填技术可以有效控制地表沉陷， 在开采的同时保护钢厂。 本论文含有图 26 幅，表格 9 个，参考文献 87 篇。 关键词关键词覆岩隔离注浆充填；孔庄煤矿；绿色开采；方案研究 万方数据 II Abstract The isolated overburden grout injection fully taking advantage of the key stratum, designing coal pillar between adjacent working faces and reasonable width of the working face, makes layers insufficient mining. In the mining, when the key stratum is not broken, the slurry is injected into the overburden layer by the high pressure of the ground drilling, and a compaction zone is ed in the middle of the working surface to control the surface subsidence. The technology effectively controls surface subsidence in practice and has been widely used. In view of the fact that the 7434 working face of Kongzhuang coal mine of Datun coal and electricity group co., ltd. Is covered by the surface steel plant, this paper studies the mining by isolated overburden grout injection. Based on the investigation and analysis of the geological mining conditions and the coal under buildings of the working face, numerical simulation was carried out, and the study on scheme of mining by isolated overburden grout injection was designed according to the simulation results. The surface subsidence prediction is carried out by the probability integral for grouting backfilling and long wall mining. The 7434 working face depth is 793.8m～893.8m, of which the bedrock thickness is 646.1m～746.1m. There are 7 key stratums above the coal seam, which has a suitable grouting horizon. The working face is 1237 meters long, 197 meters wide and average thickness is 4.5m. Kongzhuang Coal Mine has flat terrain, abundant water source, convenient power installation, and a power plant 5 km away can be used to supply fly ash. The cut hole side of 7434 working face is covered by a steel plant on the ground. Grouting filling is needed to protect the steel plant. Therefore, it is feasible and necessary to carry out mining by isolated overburden grout injection on the 7434 working face. According to the geological mining conditions, the numerical simulation of the 7434 working face of mining by isolated overburden grout injection shows that the maximum surface subsidence is 393mm; the maximum surface tilting value is 1.66mm/m; the maximum surface displacement is -177.5mm; the maximum horizontal deation is -1.79mm/m. The building is in class I damage level, and the grouting filling project effectively controls the surface sinking. From the simulation results, the rock layer of the third key stratum of the coal seam is determined as the 7434 working face grouting layer, which is 150m away from the top plate of the 7434 万方数据 III working face. the slurry is made by fly ash, its concentration should be 70. and the grouting pressure should be maintained at 8 MPa. The plan need 5 borehole, which divide into 3 groups. Compared with relocating houses, traditional strip mining, traditional separated layer grouting filling mining and underground filling mining, isolated overburden grout injection has lower filling cost per ton of coal, higher coal recovery rate and smaller subsidence coefficient. The construction period of filling system is short and the investment is small. Isolated overburden grout injection is more suitable to solve the problem of 7434 working face. The prediction of mining subsidence of 7434 working face is carried out by probability integration . It is expected to be divided into two types, namely the first type of longwall mining and the second type of mining by isolated overburden grout injection. After the first type, the working face is in class iv damage, and the steel plant area is in class ii damage. After the second type, the steel plant is in class i damage. In a word, the isolated overburden grout injection can effectively control the surface subsidence and protect the steel mill while mining. This dissertation contains 26 figures, 9 tables and 87 references. Key words isolated overburden grout injection, Kongzhuang coal mine; green mining; study on scheme 万方数据 IV 目目 录录 摘摘 要要 ........................................................................................................................... I 图清单图清单 ..................................................................................................................... VIII 表清单表清单 .......................................................................................................................... X 变量注释表变量注释表 ................................................................................................................ XI 1 绪论绪论 ............................................................................................................................ 1 1.1 问题提出与研究意义 ............................................................................................ 1 1.2 文献综述 ................................................................................................................ 2 1.3 研究内容和研究方法 ............................................................................................ 5 2 7434 工作面地质开采条件及构筑物压煤情况工作面地质开采条件及构筑物压煤情况 ....................................................... 7 2.1 孔庄煤矿概况 ........................................................................................................ 7 2.2 IV1 采区 7434 工作面地质开采条件 ................................................................. 13 2.3 7434 工作面构筑物压煤情况 ............................................................................. 19 2.4 本章小结 .............................................................................................................. 21 3 构筑物下覆岩隔离注浆充填开采方案研究构筑物下覆岩隔离注浆充填开采方案研究 .......................................................... 22 3.1 覆岩隔离注浆充填技术原理 .............................................................................. 22 3.2 覆岩隔离注浆充填控制 7434 工作面开采沉陷的模拟研究 ............................ 22 3.3 7434 工作面覆岩隔离注浆充填方案 ................................................................. 28 3.4 覆岩隔离注浆充填技术与同类技术的比较...................37 3.5 本章小结 .............................................................................................................. 38 4 7434 工作面开采沉陷预计及构筑工作面开采沉陷预计及构筑物采动损坏评价物采动损坏评价............................................. 40 4.1 开采沉陷预计模型与方法 .................................................................................. 40 4.2 7434 工作面开采沉陷预计 ................................................................................. 41 4.3 本章小结 .............................................................................................................. 48 5 结论与展望结论与展望 .............................................................................................................. 49 5.1 主要结论 .............................................................................................................. 49 5.2 工作展望 .............................................................................................................. 50 参参考考文献文献 ..................................................................................................................... 51 作者简历作者简历 ..................................................................................................................... 56 论文原创性声明论文原创性声明...47 万方数据 V 学位论文数据集学位论文数据集...48 万方数据 VI Contents Abstract ........................................................................................................................ II 1 Introduction ............................................................................................................... 1 1.1 Introduction of the Problem and Significance ........................................................ 1 1.2 Literature Review ................................................................................................... 2 1.3 Research Content and Research ology ....................................................... 5 2 Geological Mining Conditions and Coal Crushing of Structures of 7434 Working Face................................................................................................................................ 7 2.1 Overview of KongZhuang Coal Mine .................................................................... 7 2.2 Geological Mining Conditions of 7434 Working Face in IV1 Mining Area ........ 13 2.3 Coal Crushing of Structures of 7434 Working Face ............................................. 19 2.4 Chapter Summary ................................................................................................. 21 3 Study on Scheme of Mining by Isolated Overburden Grout Injection Under the Structure ..................................................................................................................... 22 3.1 Technical Principle of Isolated Overburden Grout Injection ................................ 22 3.2 Numerical Simulation Study of Mining Subsidence in 7434 Working Face With Isolated Overburden Grout Injection ........................................................................... 22 3.3 the Plan of Isolated Overburden Grout Injection in 7434 Working Face ............. 28 3.4 The comparison between Isolated Overburden Grout Injection and Other Similar Technology..37 3.4 Chapter Summary ................................................................................................. 38 4 Mining Subsidence Prediction and uation of Mining Damage of Structures in 7434 Working Face ................................................................................................ 40 4.1 the Model and of Mining Subsidence Prediction .................................... 40 4.2 7434 Working Face Mining Subsidence Prediction .............................................. 41 4.3 Chapter Summary ................................................................................................. 48 5 Conclusions and Prospects ..................................................................................... 49 5.1 Conclusions ........................................................................................................... 49 5.2 Prospects ............................................................................................................... 50 References.41 Author’s Resume.46 万方数据 VII Declaration of Thesis Originality47 Thesis Data Collection...48 万方数据 VIII 图清单图清单 图序号 图名称 页码 图 1-1 技术路线 6 Figure 1-1 Technical route of the dissertation 6 图 2-1 孔庄煤矿位置图 7 Figure 2-1 The position of KongZhuang coal mine 7 图 2-2 7 煤顶底板岩性 15 Figure 2-2 Rock ation properties of roof and floor of the coal seam 15 图 2-3 11-1 钻孔柱状 17 Figure 2-3 Drilled column of NO.11-1 17 图 2-4 7434 工作面采工图 18 Figure 2-4 Mining map of 7434 working face 18 图 2-5 钢厂实拍图 19 Figure 2-5 Steel mill 19 图 2-6 7434 工作面井上下对照图 20 Figure 2-6 Surface and underground feature of 7434 working face 20 图 3-1 覆岩隔离注浆充填示意图 22 Figure 3-1 Isolated Overburden Grout Injection schematic diagram 22 图 3-2 计算机模拟模型简图 24 Figure 3-2 Model sketch 24 图 3-3 7434 工作面注浆模拟图 25 Figure 3-3 Mimic display of 7434 working face with Isolated Overburden Grout Injection 25 图 3-4 注浆充填开采下的地表下沉量 26 Figure 3-4 Surface subsidence profiles with Isolated Overburden Grout Injection 26 图 3-5 注浆充填开采下的地表倾斜量 26 Figure 3-5 Surface tilting profiles with Isolated Overburden Grout Injection 26 图 3-6 注浆充填开采下的地表水平移动量 27 万方数据 IX Figure 3-6 Profiles of Surface Displacement with Isolated Overburden Grout Injection 27 图 3-7 注浆充填开采下的地表水平变形量 27 Figure 3-7 Profiles of horizontal deation with Isolated Overburden Grout Injection 27 图 3-8 关键层判别软件 29 Figure 3-8 The software for discriminating Key Stratum 29 图 3-9 7434 工作面上覆关键层 30 Figure 3-9 The key stratum on the 7434 working face 30 图 3-10 高压注浆示意图 31 Figure 3-10 The grouting with high pressure 31 图 3-11 粉煤灰 32 Figure 3-11 fly ash 32 图 3-12 粉煤灰浆体 33 Figure 3-12 The slurry of fly ash 33 图 3-13 8 种浆体在不同浓度下的塑性粘度变化 34 Figure 3-13 The changes of plastic viscosity 8 slurries 34 图 3-14 建筑物压煤类型 35 Figure 3-14 The types of coal mining under building 35 图 3-15 钻孔布置示意图 35 Figure 3-15 The borehole arrangements 35 图 3-16 7434 工作面钻孔布置示意图 36 Figure 3-16 The borehole arrangements of 7434 working face 36 图 3