五虎山煤矿多重动压影响下抽采巷道布置优化研究

发布时间：2018-02-26 09:00

本文关键词： 近距离煤层底板巷道位置优化数值模拟监测　出处：《内蒙古科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：在近距离煤层群地下开采的过程中，下部煤层巷道容易受到上部煤层工作面开采以及所留设保护煤柱支撑压力影响，形成应力集中，集中应力沿一定角度向底板进行传递，破坏了下部煤层原岩应力状态，使得下部煤层围岩应力重新分布，当围岩应力大于围岩强度时，底板巷道围岩发生塑性变形破坏，一般表现为：巷道围岩变形移近量较大，矿压显现剧烈，巷道维护困难，巷道顶板容易发生垮塌。尤其当下部煤层巷道使用年限较长且巷道位置布置不合理时，巷道的日常维护变得尤为困难，在近距离煤层开采的过程中，如何解决上部煤层采动对底板的破坏，仍有许多问题需要解决。本文以神华乌海能源公司五虎山煤矿为研究对象，结合五虎山煤矿矿井实际情况，通过现场调研、理论分析、数值模拟以及工业场地试验验证的方法，对五虎山近距离煤层群，底板巷道位置的优化布置进行研究。五虎山属高瓦斯矿井，拟在下部煤层开挖巷道，，前期作为瓦斯抽放巷道，后期作为工作面回采巷道使用，巷道受到上部煤层采动影响，且巷道服务年限较长，如果巷道位置布置不当，巷道的维护使用代价较高，针对这一情况，论文进行一系列研究：首先通过对五虎山煤矿现场实地采样，确定巷道顶板围岩力学性质；然后根据所的巷道围岩力学性质，通过数值模拟方法，对上部煤层进行开采模拟，得到采动影响下，底板巷道应力和位移变化特征，经过几个备选方案的对比，确定将底板巷道布置在上部煤层的采空区下方，是较为合理的布置方式，并给出巷道的支护方案，最后，对布置巷道现场进行实地监测，观测结果表明，巷道围岩变形较小，围岩稳定，能够满足矿上正常生产活动，巷道位置布置的合理性得到验证。本论文对五虎山底板回采巷道位置进行优化设计，确定出较为合理的巷道布置位置并得到现场实际验证，保证了矿山安全正常运行，同时为相同地质条件矿井底板巷道布置提供参考。
[Abstract]:In the process of underground mining of short distance coal seam group, the roadway in the lower coal seam is easily affected by the mining of the upper coal seam face and the supporting pressure of the protection pillar left behind, which forms the stress concentration and transfers the concentration stress along a certain angle to the floor. The stress state of the original rock in the lower coal seam is destroyed, and the stress of the surrounding rock in the lower coal seam is redistributed. When the stress of the surrounding rock is greater than the strength of the surrounding rock, the plastic deformation of the surrounding rock of the floor roadway occurs. Mine pressure appears violently, roadway maintenance is difficult, roadway roof is prone to collapse, especially when the roadway in the lower coal seam has a long service life and the location of roadway is not reasonable, the daily maintenance of roadway becomes more difficult. In the process of coal seam mining, there are still many problems to be solved. This paper takes Wuhushan Coal Mine of Shenhua Wuhai Energy Company as the research object, combined with the actual situation of Wuhushan Coal Mine, through field investigation, theoretical analysis, numerical simulation and the method of industrial site test and verification. In this paper, the location optimization of coal seam group and floor roadway in Wuhu Mountain is studied. Wuhu Mountain is a high gas mine, which is intended to be excavated in the lower coal seam, used as a gas drainage roadway in the early stage and used as a mining roadway in the working face at the later stage. The roadway is affected by the mining movement of the upper coal seam, and the service period of the roadway is longer. If the location of roadway is improperly arranged, the maintenance and use cost of roadway is high. In view of this situation, this paper carries on a series of research: firstly, through sampling on the spot of Wuhushan coal mine, the mechanical properties of roadway roof surrounding rock are determined; Then according to the mechanical properties of roadway surrounding rock, the mining simulation of upper coal seam is carried out by numerical simulation method, and the characteristics of stress and displacement change of roadway under the influence of mining are obtained, and several alternative schemes are compared. It is reasonable to arrange the floor roadway under the goaf of the upper coal seam, and the supporting scheme of the roadway is given. Finally, the site monitoring of the layout roadway is carried out. The observation results show that the surrounding rock deformation of the roadway is small. The surrounding rock is stable and can meet the normal production activity in the mine, and the rationality of roadway location is verified. In this paper, the optimum design of the roadway position of Wuhu Mountain floor mining is carried out, and the reasonable location of the roadway is determined and verified in the field, which ensures the safe and normal operation of the mine. At the same time, it provides a reference for the layout of mine floor roadway under the same geological conditions.
【学位授予单位】：内蒙古科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD353

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