沿空掘巷煤柱合理宽度与巷道支护技术的研究
发布时间：2019-03-05 14:17
【摘要】：文章以山西省朔州市南阳坡矿大采高工作面为研究背景,依托“(编号：2013FSX064)煤柱优化设计与加固技术及动压影响下安全监测的研究”,运用理论分析、数值模拟和现场的监测的方法对煤柱的变形特征和巷道围岩控制技术进行系统的研究。针对南阳坡矿的特殊情况,通过此次项目的研究,建立一套完整的煤柱留设方法和巷道的安全监测技术,为以后南阳坡煤矿的开采提供可靠的理论和技术支持。文章研究的主要内容和研究成果如下：(1)通过对煤柱的应力状态分布的论述,分析了护巷煤柱和区段间煤柱周围的松散区、塑性区以及原岩应力区分布情况。通过岩石单轴抗压试验,基于抗剪强度理论,得到了煤的基本物理力学参数,并结合相关理论和试验数据,分别对3“层和5“层留设煤柱宽度进行了计算。3“层理论计算结果为13 m,5#层理论计算宽度为19m。(2)运用MIDAS GTS对3“层和5“层煤柱留设的稳定性进行了数值模拟,分析了巷道顶板、底板和邦部的位移。确定3“层煤柱宽度宜为15 m,5“层煤柱宽度宜为25 m。并分析了3“层回采对5#层巷道稳定的影响。研究结果表明：若5“层煤柱布置在3#层煤柱正下方,5#层巷道稳定受3#层回采影响,不利于巷道的支护。最不利位置为巷道布置在煤柱下方,巷道受力过大,维护困难且易于破坏。宜将不同煤层的煤柱错开布置,有利于煤柱的稳定和巷道维护,煤柱中心错开距离宜为60m。(3)使用MSC-400锚杆(索)测力计和数显式收敛计对3“层断面1和断面2进行锚杆(索)受力监测和巷道变形监测。监测结果显示,锚杆受力约在23 d之后稳定,锚索受力约在20 d之后稳定。巷道顶板中间的锚杆(索)受力最大。巷道掘进过程中测站处围岩变化趋势为短期逐渐增大后增量开始减小,整个过程变形均较小。监测结果说明：结合相关理论采用“锚—网—带”的支护形式对巷道的支护非常有效,煤柱留设宽度合理。
[Abstract]:Based on the research background of the large mining height working face in Nanyangpo Mine, Shuozhou City, Shanxi Province, this paper applies the theoretical analysis, relying on "(No.: 2013FSX064) coal pillar optimization design and reinforcement technology and safety monitoring under the influence of dynamic pressure". The deformation characteristics of coal pillar and the control technology of surrounding rock of roadway are systematically studied by numerical simulation and on-site monitoring. In view of the special situation of Nanyang slope mine, through the research of this project, a set of complete coal pillar setting method and safety monitoring technology of roadway are established, which provides reliable theoretical and technical support for the future mining of Nanyang slope coal mine. The main contents and achievements of this paper are as follows: (1) by discussing the stress state distribution of coal pillar, the distribution of loose zone, plastic zone and original rock stress zone around pillar and section between pillar and section are analyzed. Based on the theory of shear strength and uniaxial compression test of rock, the basic physical and mechanical parameters of coal are obtained, and the relevant theory and experimental data are combined. The width of coal pillar in 3 "layer and 5" layer is calculated respectively. The theoretical calculation result of 3 "layer is 13 m, and that of 5" layer is 13 m. The theoretical calculation width of 5 # layer is 19m. (2) the stability of coal pillar in 3 "layer and 5" layer is numerically simulated by MIDAS GTS, and the displacement of roadway roof, floor and bond is analyzed. The width of 3 "layer coal pillar and 5" layer coal pillar should be 15 m and 25 m respectively. The influence of 3 "layer stoping on the stability of roadway in 5 # layer is analyzed. The results show that if the 5 "layer coal pillar is placed directly below the 3 # layer pillar, the 5 # layer roadway is stable affected by the 3 # layer mining, which is not conducive to the roadway support. The most unfavorable position is that the roadway is placed under the coal pillar, the roadway is subjected to too much force, maintenance is difficult and easy to destroy. It is suitable to stagger the coal pillars in different coal seams, which is beneficial to the stability of coal pillars and the maintenance of roadway. The center staggered distance of coal pillar should be 60 m. (3) using MSC-400 bolt (cable) dynamometer and numerical explicit convergence meter to monitor the stress of bolt (cable) and tunnel deformation on section 1 and section 2 of 3 "layer. The monitoring results show that the anchor force is stable after 23 days, and the anchor cable is stable after 20 days. The bolt (cable) in the middle of roadway roof is the biggest. In the process of tunnel excavation, the change trend of the surrounding rock at the station is gradually increasing for a short time and then the increment begins to decrease, and the deformation of the whole process is small. The monitoring results show that "anchor-net-belt" supporting form is very effective in supporting roadway, and the width of coal pillar is reasonable.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353
本文编号：2434991
[Abstract]:Based on the research background of the large mining height working face in Nanyangpo Mine, Shuozhou City, Shanxi Province, this paper applies the theoretical analysis, relying on "(No.: 2013FSX064) coal pillar optimization design and reinforcement technology and safety monitoring under the influence of dynamic pressure". The deformation characteristics of coal pillar and the control technology of surrounding rock of roadway are systematically studied by numerical simulation and on-site monitoring. In view of the special situation of Nanyang slope mine, through the research of this project, a set of complete coal pillar setting method and safety monitoring technology of roadway are established, which provides reliable theoretical and technical support for the future mining of Nanyang slope coal mine. The main contents and achievements of this paper are as follows: (1) by discussing the stress state distribution of coal pillar, the distribution of loose zone, plastic zone and original rock stress zone around pillar and section between pillar and section are analyzed. Based on the theory of shear strength and uniaxial compression test of rock, the basic physical and mechanical parameters of coal are obtained, and the relevant theory and experimental data are combined. The width of coal pillar in 3 "layer and 5" layer is calculated respectively. The theoretical calculation result of 3 "layer is 13 m, and that of 5" layer is 13 m. The theoretical calculation width of 5 # layer is 19m. (2) the stability of coal pillar in 3 "layer and 5" layer is numerically simulated by MIDAS GTS, and the displacement of roadway roof, floor and bond is analyzed. The width of 3 "layer coal pillar and 5" layer coal pillar should be 15 m and 25 m respectively. The influence of 3 "layer stoping on the stability of roadway in 5 # layer is analyzed. The results show that if the 5 "layer coal pillar is placed directly below the 3 # layer pillar, the 5 # layer roadway is stable affected by the 3 # layer mining, which is not conducive to the roadway support. The most unfavorable position is that the roadway is placed under the coal pillar, the roadway is subjected to too much force, maintenance is difficult and easy to destroy. It is suitable to stagger the coal pillars in different coal seams, which is beneficial to the stability of coal pillars and the maintenance of roadway. The center staggered distance of coal pillar should be 60 m. (3) using MSC-400 bolt (cable) dynamometer and numerical explicit convergence meter to monitor the stress of bolt (cable) and tunnel deformation on section 1 and section 2 of 3 "layer. The monitoring results show that the anchor force is stable after 23 days, and the anchor cable is stable after 20 days. The bolt (cable) in the middle of roadway roof is the biggest. In the process of tunnel excavation, the change trend of the surrounding rock at the station is gradually increasing for a short time and then the increment begins to decrease, and the deformation of the whole process is small. The monitoring results show that "anchor-net-belt" supporting form is very effective in supporting roadway, and the width of coal pillar is reasonable.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353
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