麟游矿区综放开采地表移动变形规律研究

发布时间：2018-04-03 17:57

本文选题：地表移动变形规律　切入点：地表观测　出处：《西安科技大学》2017年硕士论文

【摘要】：麟游矿区是陕西继彬长矿区后又一个开发的大型煤炭基地,该矿区地表为残塬沟壑梁峁相间地貌,煤层埋藏深、开采厚度大,且覆岩中存在厚硬岩层,其对地表移动变形起着控制作用,当该矿区进行大范围综放开采时,覆岩结构将发生破坏,可能诱发强矿压和地表沟壑区滑坡灾害的发生。因此,开展麟游矿区综放开采地表移动变形规律研究,对麟游矿区实现安全、绿色、高效开发具有重要意义。论文以麟游矿区郭家河煤矿3#煤层I盘区开采为研究对象,通过分析1303和1305工作面开采地表移动变形观测数据可知:单一工作面开采结束后,地表下沉量较小,下沉系数η为0.140,但局部沟壑区域地表下沉量较大;两个工作面开采结束后,下沉系数η也仅为0.254。针对这一现象,应用物理相似材料模拟和数值模拟对郭家河煤矿综放开采覆岩运移规律展开研究,研究表明:(1)郭家河煤矿覆岩中存在高位厚硬岩层,其为研究区域的关键层;(2)区段煤柱对覆岩起到一定的支撑作用,当两个工作面开采结束后,上覆岩层在区段煤柱的作用下形成连续垮落拱,拱形结构对覆岩运移起到了重要控制作用;(3)关键层为高位厚硬岩层,覆岩破坏未波及至关键层,关键层位于弯曲下沉带,抑制了地表的下沉量;(4)揭示了在接近充分采动条件下,下沉系数较小的原因;(5)应用计算机反演模拟及对沟壑区坡体自身稳定性进行综合分析,给出了局部沟壑区域地表下沉系数增加的原因:由于坡体自身稳定差,在采动影响下将产生一定的滑移量,导致下沉系数略大。研究成果不仅为麟游矿区综放开采地表移动变形规律研究提供了科学依据,也对该矿区地面建筑物保护、预防地表沟壑区滑坡灾害的发生及井下强矿压的防治等具有一定的指导价值。
[Abstract]:Linyou mining area is another large coal base developed after Binchang mining area in Shaanxi Province. The surface of the mining area is composed of gully ridge and knoll landforms. The coal seam is buried deep, the mining thickness is large, and there are thick hard strata in the overburden rock.It plays an important role in controlling the surface movement and deformation. When a large area of fully mechanized caving mining is carried out in this mining area, the overburden structure will be destroyed, which may induce the occurrence of strong mine pressure and landslide disaster in the gully area.Therefore, it is of great significance for Linyou mining area to carry out research on the law of surface movement and deformation of fully mechanized caving mining in Linyou mining area.This paper takes the coal seam I area mining of Guojiahe coal mine in Linyou mining area as the research object. By analyzing the observation data of surface movement and deformation of mining face 1303 and 1305, it can be seen that after the mining of a single working face is finished, the amount of surface subsidence is relatively small.The subsidence coefficient 畏 is 0.140, but the surface subsidence is larger in the local gully area, and the subsidence coefficient 畏 is only 0.254 after the mining of the two faces.In view of this phenomenon, the overburden migration law of Guojiahe coal mine is studied by using physical similar material simulation and numerical simulation. The study shows that there are high thick hard strata in overburden rock of Guojiahe coal mine.The coal pillar of the section is the key layer in the study area. The coal pillar plays a supporting role to the overburden rock. When the mining of the two working faces is finished, the overlying strata will form a continuous caving arch under the action of the section pillar.The arch structure plays an important role in controlling the overburden rock migration. The key layer is high thick hard rock layer. The overburden failure does not spread to the key layer, and the key layer is located in the bending subsidence zone, which inhibits the subsidence of the surface.By using computer inversion simulation and comprehensive analysis of slope body stability in the gully region, the reasons for the increase of surface subsidence coefficient in local gully region are given: because of the poor stability of slope body itself.Under the influence of mining, a certain amount of slip will be produced and the subsidence coefficient will be slightly larger.The research results not only provide a scientific basis for the study of the law of surface movement and deformation of fully mechanized caving mining in Linyou mining area, but also protect the ground buildings in the mining area.It has certain guiding value to prevent the occurrence of landslide disaster and the prevention of underground strong rock pressure in the gully area.
【学位授予单位】：西安科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD325

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