浅埋煤层大采高综采面矿压规律及合理区段煤柱留设研究

发布时间：2018-03-13 22:24

本文选题：浅埋煤层　切入点：大采高　出处：《山东科技大学》2017年硕士论文　论文类型：学位论文

【摘要】：王家塔煤矿位于神府矿区东胜煤田万利矿区西南部,煤层埋藏浅、倾角小及上覆厚松散层是该矿区煤层赋存特点。长期对浅埋煤层长壁开采实践得出浅埋煤层矿压显现较普通埋深工作面强烈等特点。根据我们对王家塔煤矿3101—3106工作面的开采经验:工作面矿压相对平稳,无瓦斯突出、冲击地压等地质灾害,且20m回采巷道煤柱偏于安全。结合王家塔煤矿的实际地质和开采条件,研究3107顶板运动规律、工作面矿压规律和合理煤柱留设等问题。首先利用关键层理论对3107工作面上覆岩层关键层进行判定,经理论计算得出顶板有C1、C2两个关键层,利用传递岩梁理论以及关键层失稳机理进一步分析了其顶板破坏运动形式。然后根据KJ216检测系统对工作面矿压规律的实测结果分析:最小初撑力必须大于5760KN,来压步距,8.7～42.0m,周期来压与来压步距大小交替出现且工作面矿压相对平稳,进一步佐证了上覆岩层中有两个关键层的结论,紧接着对三条回采巷道的围岩进行动态监测得出,巷道顶底板及两帮最大移进量分别为34mm和15.2mm,巷道矿压不大、变形微弱,说明现有的工作面及巷道支护方式合理,偏于安全。最后先理论计算分析合理煤柱宽度,在利用数值模拟方法对三条巷道围岩移动及矿压的分析,宽20m煤柱尺寸允许减小,为降低成本提高回采率,模拟10-20m不同宽度的煤柱,分析了塑性变形及位移、应力云图,总结得出矿合理的区段煤柱宽度为12-14m。
[Abstract]:Wangjiata coal mine is located in the southwest of Wanli mining area in Dongsheng coalfield, Shenfu mining area. The coal seam is shallow. Small dip angle and thick overlying loose layer are the characteristics of coal seam in this mining area. The long wall mining practice of shallow coal seam shows that the mine pressure of shallow buried coal seam is stronger than that of ordinary buried coal face. According to our analysis of 3101-3106 work in Wangjiata Coal Mine, Face mining experience: the face pressure is relatively stable, There are no gas outburst, impact ground pressure and other geological hazards, and the coal pillar of 20m mining roadway is on the side of safety. Combined with the actual geology and mining conditions of Wangjiata Coal Mine, the movement law of 3107 roof is studied. First, the key strata of the overlying strata of 3107 face are judged by using the key layer theory, and the two key layers of C _ 1 and C _ 2 are obtained by theoretical calculation. Based on the transfer rock beam theory and the instability mechanism of the key strata, the failure motion of the roof is further analyzed. Then, according to the measured results of the KJ216 detection system, the minimum initial bracing force must be greater than 5760KN, and the pressure of the working face must be higher than 5760KN. The step distance is 8.7 ~ 42.0 m, the interval between the periodic pressure and the pressure step appears alternately, and the mine pressure of the working face is relatively stable. It further proves the conclusion that there are two key strata in the overlying strata. Then, the dynamic monitoring of the surrounding rock of the three mining roadways shows that the maximum moving quantities of the roof and floor and the two sides of the roadway are 34mm and 15.2mm respectively, and the mine pressure of the roadway is not large and the deformation is weak. At last, the reasonable coal pillar width is calculated and analyzed theoretically. In the analysis of surrounding rock movement and rock pressure of three roadways by numerical simulation, the width of coal pillar is allowed to decrease by 20m. In order to reduce the cost and increase the recovery rate, the plastic deformation, displacement and stress cloud map of coal pillars with different widths of 10-20m were simulated, and the reasonable coal pillar width of 12-14m was concluded.
【学位授予单位】：山东科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD323;TD822.3

【参考文献】