上行开采条件下多煤层开采覆岩破坏规律研究  

Study on Overlying Strata Failure Rule in Process of Multi-seam Ascending Mining

作　　者：赵宝峰 ZHAO Baofeng(China Coal Technology and Engineering Group Xi 爷 an Research Institute, Xi'an 710054, China;Shanxi Key Laboratory of Coal Mine Water Hazard Prevention and Control Technology, Xi'an 710177, China)

机构地区：[1]中煤科工集团西安研究院有限公司,陕西西安710054 [2]陕西省煤矿水害防治技术重点实验室,陕西西安710177

出　　处：《矿业安全与环保》2016年第6期13-15,28,共4页Mining Safety & Environmental Protection

基　　金：国家科技支撑计划课题(2012BAK04B04);中国煤炭科工集团面上项目(2011MS037);中煤科工集团西安研究院面上项目(2016XAYMS10)

摘　　要：为了定量研究上行开采条件下单一煤层和多煤层开采的覆岩破坏规律,利用FLAC3D数值模拟软件,分别对麦垛山煤矿仅开采6煤和先开采6煤后开采2煤两种情况下覆岩破坏规律进行了研究,结果表明:仅开采6煤时,弯曲下沉带主要发育在地表以下491.02 m,导水裂缝带发育高度为51.70 m,地表下沉值为94.00 mm;先开采6煤后开采2煤时,弯曲下沉带主要发育在地表以下380.00 m,6煤导水裂缝带发育高度为59.00 m,地表下沉值为375.00 mm。上行开采对于下部煤层6煤导水裂缝带发育高度影响不大,由于上部煤层2煤导水裂缝带的发育,导致弯曲下沉带范围缩小,地表下沉值由于上部煤层2煤的开采而显著增大。In order to quantatively study the failure rule of the overlying rock strata under the condition of the ascendingmining of the single seam and multiple seams, FLAC3D numerical simulation sofware was used for studying the failure rule of theoverlying rock strata in two cases in Maiduoshan Mine, that is, the first case is that only No. 6 seam is mined, and the secondcase is that the No. 5 seam is first mined and then No. 2 seam. Study results showed that in the first case, the saggingsubsidence zone mainly developed 491.02 m below the surface, the development height of the water flowing fractured zone was51. 70 m and the surface subsidence amount was 94.00 mm; in the second case, the sagging subsidence zone mainly developed380.00 m below the surface, the development height of the water flowing fractured zone of No. 6 seam was 59. 00 m and thesurface subsidence amount was 375.00 mm. The impact of the ascending mining on the develoment height of the water flowingfractured zone of the lower No. 6 seam was not big, the development of water flowing fractured zone of the upper No. 2 seam ledto the scope of the sagging subsidence zone to be reduced, and the the surface subsidence amount was significantly increased dueto the mining of the upper No. 2 seam.

关 键 词：上行开采 覆岩破坏规律 导水裂缝带 弯曲下沉带 数值模拟 

分 类 号：TD82[矿业工程—煤矿开采]