梁宝寺煤矿3420孤岛工作面冲击地压防治技术研究.pdf

分类号分类号TD82密级公 开密级公 开 U D C 单位代码单位代码10424 学 位 论 文学 位 论 文 梁宝寺煤矿梁宝寺煤矿 3420 孤岛工作面 冲击地压防治技术研究 孤岛工作面 冲击地压防治技术研究 程先振程先振 申请学位级别申请学位级别硕士学位硕士学位专业名称专业名称矿业工程矿业工程 指导教师姓名指导教师姓名林东才林东才职称职称教授教授 副指导教师姓名副指导教师姓名谭洪山谭洪山职称职称高级工程师高级工程师 山 东 科 技 大 学山 东 科 技 大 学 二〇一八年六月二〇一八年六月 万方数据 论文题目论文题目 梁宝寺煤矿梁宝寺煤矿 3420 孤岛工作面 冲击地压防治技术研究 孤岛工作面 冲击地压防治技术研究 作者姓名 程先振作者姓名 程先振入学时间入学时间2015 年年 9 月月 专业名称 矿业工程专业名称 矿业工程研究方向研究方向矿山压力与岩层控制矿山压力与岩层控制 指导教师 林东才指导教师 林东才职称教授职称教授 谭洪山谭洪山高级工程师高级工程师 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 prevention and control technology of rock burst in 3420 island working face of Liang Bao Si coal mine ADissertation ted in fulfillment of the requirements of the degree of MASTER OF ENGINEERING from Shandong University of Science and Technology by Cheng Xianzhen Supervisor Professor Lin Dongcai Vice Supervisor Engineer Tan Hongshan College of Mining and Safety Engineering Jun 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 摘要摘要 针对深井条带跳采孤岛工作面冲击地压事故多发问题，以梁宝寺煤矿 3420 工作面为工程背景。基于理论分析、数值模拟、室内试验及现场应用等方法对 孤岛工作面冲击地压灾害治理进行研究。论文主要研究内容如下 1）通过类比归纳梁宝寺两起事故，得出冲击地压发生的主要影响因素；基 于矿压监测方法研究冲击地压发生机理应力诱发与震动诱发。 2）通过理论分析算得出孤岛面力场分布形式，计算得出自重应力场施加在 孤岛工作面上的应力为 21.3MPa，超前巷道内支承压力为 30.8MPa。留设护巷 煤柱宽度为 4 米较为合适。 3）通过数值模拟得出不同工作面条件的支承压力分布、对超前影响距离及 煤体塑性区分布；得出不同推进距离下沿倾向与走向覆岩运移变形及垂直应力 分布规律。模拟得出留设煤柱宽度为 4m，巷帮最稳定；大直径卸压孔卸压间距 为 3m 时卸压效果最充分。 4） 通过工作面布置观测监测支架阻力、 巷道变形量、 超前应力及动载监测。 得出初压步距为 36m，周期来压步距 23-25m；两巷观测巷道顶低板变形规律、 塑性区演变冲击过程；超前观测得出超前影响范围为 41m，超前应力高峰位置 为前方 26m；动态监测得出顶板覆岩运移规律；震动与应力监测耦合用于指导 3420 面采取局部卸压措施，同时验证数值模拟结果。 5）通过室内试验确定煤体卸压破坏方式以钻孔为中心纵向延伸，得出大直 径卸压钻孔卸压参数；现场进行注水卸压实验得出注水卸压方法的可行性；对 3420 孤岛面采取高压注水、 大直径卸压孔等防冲措施， 通过现场效果实测检验， 确定了其应用价值。 关键字关键字孤岛面；冲击地压；数值模拟；矿压监测；局部卸压 万方数据 山东科技大学硕士学位论文摘要 II ABSTRACT In view of the multiple problems of rock burst accidents on island working face in deep shaft strip mining, the 3420 working face of Liang Bao Si coal mine is taken as the engineering background. Based on overlying rock theory analysis, numerical simulation, field application , we study the treatment of rock burst hazard on island working face. The main contents of this paper are as follows 1 through the analogy of the Liang Bao Temple two accidents, combined with the expert opinion of the accident investigation group, the main influence factors of the impact ground pressure occur; based on the mine pressure monitoring to study the impact of pressure on the mechanism; through the laboratory test to determine the of pressure unloading of coal body. 2 Through theoretical analysis and calculation, the distribution of the surface force field of the isolated island is obtained. The stress of the self gravity stress field on the working surface of the island is 21.3MPa, and the support pressure is 30.8MPa. It is more suitable for the width of the coal pillar to be 4 meters. 3 through the numerical simulation, the distribution of support pressure, the influence distance and the distribution of the plastic zone of the coal body are obtained by the numerical simulation, and the deation and vertical stress distribution of the overlying rock and the overlying rock are obtained. The width of coal pillar is 4m, and the pressure relief interval of large diameter depressurization hole is designed as 3M. 4 monitoring the support resistance, roadway deation, advanced stress and dynamic load monitoring through the observation of working face layout. It is found that the initial pressure step is 36m, and the periodic pressure step distance is 23-25m; the deation law of the top low plate and the evolution process of the plastic zone in two lanes are observed. The preceding observation shows that the preceding influence range is 41m and the peak stress peak position is 26m ahead; the dynamic monitoring of the 万方数据 山东科技大学硕士学位论文摘要 III overburden movement of the top plate; and the coupling of the stress field and the vibration field to verify the numerical simulation results. 5 based on monitoring pressure observation, we test the effect of blasting, roof breaking, high-pressure water injection and large diameter pressure relief hole on 3420 island surface, and determine its application value. Keywords Island working face ; Rock burst; numerical simulation; Mine pressure monitoring; Partial pressure relief. 万方数据 山东科技大学硕士学位论文目录 IV 目录目录 摘 要摘 要........................................................................................................................I 目 录目 录.....................................................................................................................IV 1 绪论绪论..................................................................................................................... 1 1.1 研究背景及意义.................................................................................................................. 1 1.2 国内外研究现状.................................................................................................................. 2 1.3 主要研究内容及技术路线.................................................................................................. 6 2 孤岛工作面生产条件及主要冲击影响因素孤岛工作面生产条件及主要冲击影响因素....................................................9 2.1 矿井概况.............................................................................................................................. 9 2.2 孤岛工作面概况.................................................................................................................. 9 2.3 基于工程类比法确定冲击地压影响因素........................................................................ 12 3 孤岛工作面覆岩特征及诱冲机理孤岛工作面覆岩特征及诱冲机理...................................................................18 3.1 孤岛工作面覆岩断裂模型................................................................................................ 18 3.2 工作面支承压力计算........................................................................................................ 22 3.3 护巷煤柱宽度计算............................................................................................................ 24 3.4 基于监测方法研究诱冲机理............................................................................................ 25 3.5 本章小结............................................................................................................................ 28 4 冲击地压影响因素及参数优化数值模拟冲击地压影响因素及参数优化数值模拟......................................................29 4.1 数值模拟软件 FLAC3D简介............................................................................................. 29 4.2 数值模型的建立及模拟方案............................................................................................ 30 4.3 不同工作面条件模拟........................................................................................................ 32 4.4 不同推进距离模拟............................................................................................................ 36 4.5 参数优化模拟.................................................................................................................... 40 4.6 本章小结............................................................................................................................ 43 万方数据 山东科技大学硕士学位论文目录 V 5 防冲监测技术应用及防冲卸压技术研究防冲监测技术应用及防冲卸压技术研究......................................................45 5.1 支架阻力监测.................................................................................................................... 45 5.2 巷道变形量监测................................................................................................................ 47 5.3 超前应力监测.................................................................................................................... 49 5.4 动载监测............................................................................................................................ 51 5.5 微震与应力监测耦合........................................................................................................ 54 5.6 局部卸压技术实验研究.................................................................................................... 58 5.7 本章小结............................................................................................................................ 68 6 主要结论及展望主要结论及展望...............................................................................................69 6.1 主要结论............................................................................................................................ 69 6.2 展望.................................................................................................................................... 71 参考文献参考文献...............................................................................................................72 致谢致谢....................................................................................................................... 77 作者从事科学研究和学习经历简介作者从事科学研究和学习经历简介.................................................................. 78 攻读硕士期间主要成果攻读硕士期间主要成果.......................................................................................79 万方数据 山东科技大学硕士学位论文目录 VI Contents Abstract.....................................................................................................................I Contents..................................................................................................................IV 1 Introduction............................................................................................................1 1.1 Engineering Background and Significance..................................................................................1 1.2 Research Status of Rock Burst at Home andAbroad...............................................................................2 1.3Main Research Contents and Technical Route..........................................................................................6 2 Island Working Face Conditions and Main Impact Factors ............................................ 9 2.1 Mine Survey..............................................................................................................................................9 2.2 Island Working Face Profile..................................................................................................................... 9 2.3 3420 Influencing Factors of Impact Pressure.........................................................................................12 3 The Rock Characteristics and Lure Mechanism in Island Working Face .................... 18 3.1 Overlying Rock Fracture Model in Island Working Face .................................................................... 18 3.2 Working Face Support Pressure..............................................................................................................18 3.3 Working Face Support Pressure..............................................................................................................24 3.4 Mechanism of Rock Burst...................................................................................................................... 25 3.5 Summary.................................................................................................................................................28 4 Numerical Simulation of Impact Factors on Rock Burst..................................................29 4.1 Brief Introduction of Numerical Simulation Software FLAC3D...........................................................29 4.2 Numerical Modeling and Simulation......................................................................................................30 4.3 Simulation of Different Working Face Conditions.................................................................................32 4.4 Simulation of Different Propulsion Distance......................................................................................... 36 4.5 Parameter Optimization Simulation........................................................................................................40 4.6 Summary.................................................................................................................................................43 5 Research on Anti impact Monitoring and Partial Pressure Relief Technology...............45 5.1 Support Resistance Monitoring.............................................................................................................. 45 5.2 Laneway Deation Monitoring.........................................................................................................47 5.3 Pre Stress Monitoring............................................................................................................................. 49 万方数据 山东科技大学硕士学位论文目录 VII 5.4 Dynamic Load Monitoring..................................................................................................................... 51 5.5 Coupling of Microseismic and Stress Monitoring..................................................................................54 5.6 Effect Test of Erosion Control Measure................................................................................................. 58 5.7 Summary.................................................................................................................................................68 6 Main Conclusions and Prospects.........................................................................................69 7.1 Main Conclusions................................................................................................................................... 69 7.2 Prospects................................................................................................................................................. 71 References.................................................................................................................................72 Thanks.......................................................................................................................................77 Main WorkAchievement of theAuthor During Working on Master Paper......................78 Introduction to Scientific Research and Learning Experience of ThisAuther..................79 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 研究背景及意义研究背景及意义 在中国随着浅部煤炭资源的逐渐开发,现阶段矿井开采深度逐年增加,据统 计,煤矿以 9 米/年的平均递增速度向深部开采,2010 年,国属煤矿平均埋深为 700m；2020 年，这一数字将达到 1100m。采深的快速增长使冲击地压灾害逐 渐成为影响我国煤矿安全开采的主要灾害之一。 山东能源肥矿集团梁宝寺能源有限责任公司位于巨野煤田东部，设计产能 300 万吨/年，是山东能源集团的“七大”主力矿井之一。地面水平 38.23m 39.85m,地表多为农田、房屋。包含孟集村、黄垓、曹铺、桑集、张家庄、南庄、 石树庙、孙庄、老僧堂、黄河李等 10 余个村庄,主要分布在含煤区，此外地面 还有乡村公路、高压线、低压线及通讯线等设施。由于前期村庄压煤，村庄搬 迁等问题颇为复杂。造成梁宝寺矿井设计为采区条带跳采，工作面走向长壁后 退式采煤的开采工艺。 近几年,随着产量增加和开采范围的扩大,冲击地压成为梁宝寺煤矿最危险 的矿井灾害。2012 年 3 月 31 与 2016 年 8 月 15 日梁宝寺煤矿 3301 面与 35002 面发生两起较为严重的冲击事故，均出现人员伤亡，造成较大损失。 然而，与 3301、35002 工作面相比，同为具有冲击倾向性的 3 层煤的 3420 孤岛工作面。从开采设计上，3420 工作面为采区条带跳采遗留孤岛工作面；开 采深度上，3420 工作面平均标高-850m，为冲击地压高度威胁区；在工作面宽 度上也有明显变化。如不进行冲击地压灾害防治研究，3420 工作面面临着严重 的冲击地压威胁，甚至威胁矿井人员生命安全及矿井设备正常运转。 且中国能源结构为“多煤、少油、少气”的国家，煤炭储量居世界前三。煤 炭做为一次性能源消费市长占有额达 70以上，煤炭做为主要的基础能源的地 位短时间内不会发生变化[1-3]。 因此，笔者以梁宝寺煤矿 3400 采区 3420 孤岛