色连煤矿河床下开采安全性研究

发布时间：2018-03-22 11:05

本文选题：导水裂隙带　切入点：地表河流　出处：《中国矿业大学》2015年硕士论文　论文类型：学位论文

【摘要】：我国许多煤矿开采受到水体威胁,防治水已是煤矿生产中的一大难题。山西、陕西和内蒙古西部是我国重要的大型煤炭基地,该地区煤层厚、埋藏浅,地质条件优越,但是浅埋厚煤层开采也对预防地表水体的威胁提出了新挑战。色连煤矿位于内蒙古鄂尔多斯地区东胜煤田的中北部,矿井一次采全高开采多层浅埋煤层,煤层厚度变化起伏大,地表河流、沟谷密布。本文以色连煤矿河床下多煤层开采为研究对象,对其覆岩导水裂隙带与地表河流的导通性进行了研究,取得以下主要成果:(1)结合矿井地质采矿条件,利用井下仰空双端封堵注水侧漏装置和岩层钻孔探测仪,观测2-2上煤覆岩在充分采动状态的导水裂隙带高度,得出导水裂隙带最大高度为82m,裂采比为20.5,采动裂隙发育程度高。(2)以2-2上煤和2-2中煤为原型,进行了相似模拟试验和数值模拟计算,研究覆岩在重复采动下的变形破坏特征。其中,相似模拟试验结果表明:2-2上煤开挖后,最大裂隙带高度为78m,裂采比为19.5;2-2中煤开挖后,导水裂隙带高度二次发育,最终高度为95m;数值模拟计算结果表明:开挖2-2上煤后,裂隙带在采空区两侧发育最高,约为88m,采裂比22;开挖2-2中煤后,导水裂隙带高度发育至108m左右。(3)利用matlab软件对导水裂隙带与地表河床的导通性进行了分析,评价了各煤层回采的安全性。针对潜在危险区域,提出了两种安全技术措施,即限厚开采、非胶结膏体充填,并以2-2上煤为例,分析得出了非胶结膏体的充填高度、及限厚开采的采高。本文的研究成果,不仅对色连煤矿河床下浅埋多煤层的安全开采具有现实意义,同时也对其它类似矿井解放水体下压煤有一定借鉴作用。
[Abstract]:Many coal mines in China are threatened by water bodies, and water control has become a major problem in coal production. Shanxi, Shaanxi and the western part of Inner Mongolia are important large coal bases in China, where coal seams are thick, shallow buried and have superior geological conditions. However, the mining of shallow thick coal seam also poses a new challenge to prevent the threat of surface water body. Selian Coal Mine is located in the central and northern part of Dongsheng coalfield in Ordos area, Inner Mongolia. The surface rivers and gullies are densely distributed. In this paper, taking the mining of multiple coal seams under the riverbed of Xilian coal mine as the research object, the conductivity of the overburden water conduction fissure zone and the surface river is studied, and the following main achievements are obtained: 1) combined with the mining conditions of mine geology. The height of water-conducting fissure zone of 2-2 coal overburden rock in full mining state is observed by using downhole double end plugging water injection side leakage device and rock stratum drilling detector. It is concluded that the maximum height of water-conducting fissure zone is 82 m, the ratio of fracture to production is 20.5, and the development degree of mining fissures is high.) taking 2-2 coal and 2-2 medium coal as the prototypes, similar simulation tests and numerical simulation calculations are carried out. The characteristics of deformation and failure of overburden rock under repeated mining are studied. The results of similar simulation test show that the maximum height of fracture zone is 78 m, the ratio of crack to mining is 19.5 ~ 2 ~ 2 after coal excavation, and the height of water-conducting fracture zone is developed twice after the excavation of the upper coal, the maximum fracture zone height is 78 m, and the ratio of crack to mining is 19.5 ~ 2-2. The final height is 95 m. The numerical simulation results show that the fracture zone has the highest development on both sides of the goaf, about 88 m, the ratio of mining crack is 22, and after the excavation of 2-2 coal, the fracture zone is the highest. This paper analyzes the conductivity of the aqueduct fissure zone and the surface riverbed by using matlab software, evaluates the safety of each coal seam recovery, and puts forward two kinds of safety technical measures in view of the potential danger area. The filling height of the non-cemented paste and the mining height of the limited thickness mining are analyzed and obtained by taking 2-2 coal as an example. It is not only of practical significance for the safe mining of shallow and multi-coal seams under the riverbed of Xelian coal mine, but also useful for other similar coal mines to liberate the water body under pressure coal.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD823.83

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