龙王沟矿6～上煤采空区下特厚煤层综放面矿压规律研究

发布时间：2018-03-24 00:04

本文选题：近距离煤层　切入点：采空区下　出处：《西安科技大学》2015年硕士论文

【摘要】：龙王沟井田处于内蒙古自治区鄂尔多斯市以东120km处,准格尔煤田中北部,为在建矿井。本井田地质构造较为简单,主采煤层为6煤,6煤平均埋深368m,平均厚度20m,煤层倾角3o~5o,6煤上方有一层平均厚度1.7m的6上煤,两层煤之间隔有4.1m的砂质泥岩和泥岩。该矿计划布置一个6煤大采高综放面和一个6上煤综采面,两工作面配采。计划6上煤采完后(走向长壁全部垮落法),在采空区下开采6煤,布置特厚煤层大采高综放工作面,综放面采放比为1:3。本文以龙王沟煤矿地质条件为背景,运用理论分析出和物理相似模拟实验的方法分析了6煤上方关键层的层位和层数、关键层的失稳方式和垮落步距、采空区下近距离特厚煤层开采的顶板来压特征、覆岩运移规律等。得出龙王沟矿6上煤综采面垮落带到达采空区上方8m,裂隙带达到38m。工作面超前支承压力峰值为11.5MPa~16.9MPa,平均为14.7MPa;峰值位置为煤壁前方10~16m,平均12m,影响范围20~30m,开采后,原岩应力明显降低,卸压效果显著。采空区下6煤综放面基本顶周期垮落步距为12~24m,平均为18.5m。支撑压力峰值位置在煤壁前方4m~46m处,压力峰值强度在11.9MPa~22.4MPa,峰值影响范围在20m~50m。开采过程中有超前于工作面的裂隙生产,裂隙发育明显,“三带”发育明显,开采至222m,冒落带最大高度达到采空区上方60m,裂隙带到达地表,地表会出现下沉。当超前断裂的部分岩柱的重量传递到支架上时,支架的工作阻力最大值是35600kN,平均21525kN,增载系数1.31~2.9,平均1.76。通过对龙王沟矿采空区下的6煤特厚煤层综放面矿压显现规律进行系统的研究,认识了采场上覆岩层的运移特征、工作面支承压力分布特征以及确定综放工作面支架工作阻力,为龙王沟矿及周边矿井的煤层开采提供合理科学的参考。
[Abstract]:Longwanggou mine field is located at 120km east of Ordos city, Inner Mongolia Autonomous region, and central and northern part of Zhunger coalfield, which is under construction. The geological structure of this mine field is relatively simple. The main coal seam is 6 coal seam with an average buried depth of 368m and an average thickness of 20m. There is an average thickness of 1.7m above the coal seam with an average thickness of 1.7m. There are 4.1 m sandy mudstone and mudstone separated between the two layers of coal. A fully mechanized caving face with large mining height of 6 coal and a fully mechanized coal face of 6 coal are planned to be arranged in this mine. Plan 6 after coal mining (all caving along long wall, mining 6 coal under goaf, layout high fully mechanized caving face in extra thick coal seam, the fully mechanized caving face ratio is 1: 3. The geological condition of Longwanggou coal mine is taken as the background of this paper, the mining ratio of fully mechanized caving face is 1: 3). By using the method of theoretical analysis and physical similarity simulation experiment, this paper analyzes the strata and the number of the key layers above 6 coal, the instability mode of the key layer and the falling step distance, and the roof pressure characteristics of the thick coal seam mining in close distance under the goaf. The law of overburden migration and so on. It is concluded that the caving zone of No. 6 top coal face of Longwanggou Mine reaches 8 m above the goaf and the fissure zone reaches 38 m. The peak value of working face leading support pressure is 11.5 MPA (16.9MPa), with an average of 14.7 MPA (average 14.7 MPA), the peak position is 1016m (12m) in front of coal wall, and the influence area is 2030m. after mining, The stress of the original rock is obviously reduced and the pressure relief effect is remarkable. The collapse distance of the basic top cycle of 6 fully mechanized coal caving face under goaf is 12 ~ 24m, with an average of 18.5 m. The peak position of the supporting pressure is located at 4m~46m in front of the coal wall. The peak pressure intensity is 22.4 MPA, and the influence range of the peak value is 20m ~ 50m. in the mining process, there are fissures ahead of the working face, the fissures develop obviously, the "three zones" develop obviously, the mining reaches 222m, the maximum height of the caving zone reaches 60m above the goaf, and the fissure zone reaches the surface of the earth's surface. The surface of the earth sinks. When the weight of some of the pillars that break ahead is transferred to the support, The maximum working resistance of the support is 35600kN with an average of 21525kN, and the load increasing coefficient is 1.31m2.9and the average is 1.76.The characteristics of overlying strata migration in the stope are understood through the systematic study of the regularity of the overlying rock strata in the fully mechanized caving face of the 6 coal and extra thick coal seam under the goaf of Longwanggou Coal Mine. The distribution characteristics of supporting pressure and the determination of working resistance of support in fully mechanized caving face provide a reasonable and scientific reference for coal seam mining in Longwanggou Mine and surrounding mines.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323;TD355

【相似文献】