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～5 º，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。

Long Wang Gou coal mine is under construction, which is located at the 20 km east of ordos city, belongs to north-central of Inner Mongolia Autonomous Region. Coal mine geological structure is simple, The main minable coal is the No.6 coal seam and the inclination angle ranged from 3° to 5°.Average buried depth of the coal seam is 359m, recoverable thickness is20 m. Above the average thickness of 1.7 m 6 coal is the overlying 6 coal seam, between two layers of coal have 4.1 m of sandy mudstone and shale. The mine plans to decorate a large mining height fully-mechanized face and a ordinary mechanized coal face. After coal mining on 6 seam, under the goaf, will decorate a special thick seam mining with large height of fully-mechanized caving on 6 seam, the fully-mechanized face mining ratio is 1:3. This paper based on the background of Long Wang Gou geological conditions, by using the method of theoretical analysis and physical simulation experiment to analysis the key strata and number above 6 seam, the key stratum instability mode and caving step distance, the secondary mining of thick coal seam mining under roof movement to pressure characteristics, law and so on. It is concluded that on 6 seam mining caving zone height of 8 m, fractured zone height of 38 m. Advance abutment pressure peak value from 11.5 to 16.9 MPa, an average of 14.7 MPa; Peak position to coal wall front 10 to 16 m, an average of 12 m, reach 20 ~ 30 m, after mining, the original rock stress significantly decreased, pressure relief effect is remarkable. 6 basic top coal caving mining face under the goaf periodic caving step distance of 12 ~ 24 m, with an average of 18.5 m. Supporting pressure peak position in front of the coal wall 4 m ~ 46 m, pressure peak intensity in 11.9 to 22.4MPa, the peak impact range in 20 m ~ 50 m. Ahead of working face a crack in the process of mining production, the fracture is apparent, "three zones" development, caving to 222 m, caving zone height is 60 m, fissure zone to the surface, the surface will be sink. When the weight of the fracture of rock pillars in advance is passed on to the bracket, Support working resistance Maximum range of 35600 kN, an average of 21525 kN, increases the load coefficient 1.31 ~2.9, with an average of 1.76. Through researching the Long Wang Gou under goaf areas of large mining height on 6 seam of coal mine pressure law , understood of the stope the movement rule of overlying rock strata, face abutment pressure distribution law and defining the support working resistance of full-mechanized caving mining face, provided reasonable and scientific reference for the similar geological conditions of coal seam mining .