龙王沟矿特厚煤层综放面矿压规律研究

发布时间：2018-04-28 13:26

本文选题：综放工作面 + 支承压力　；参考：《西安科技大学》2015年硕士论文

【摘要】：龙王沟煤矿位于内蒙古自治区准格尔煤田中北部,地处鄂尔多斯市准格尔旗薛家湾镇境内,为在建矿井。主采煤层为6号煤层,倾角为0°~5°,平均埋藏深度354m,可采厚度4.00m~30.10m,平均20m,煤类单一,矸石夹层为0~32,岩性以泥岩为主。顶板主要含砂质泥岩及粉砂岩,底板以砂质泥岩与泥岩为主。本文以龙王沟煤矿地质条件为背景,首先根据煤层埋深、煤体强度及厚度、节理裂隙、顶板条件、采放比和放煤口尺寸位置,分析得出6号煤层顶煤冒放性一般;其次运用物理相似材料模拟实验手段研究得出初采期直接顶随采随落,老顶周期来压步距14m~37m(平均23m),随着推进,工作面上位岩层出现“悬臂梁”产生、折断和“砌体梁”形成、失稳,及两种结构交替的现象,这是造成综放面周期来压的原因,同时工作面超前支承压力增大,峰值在9.2MPa~11.7MPa之间。又通过数值模拟及理论计算认为,工作面煤壁上方顶板为剪切与拉伸的复合型破坏,采空区上方顶板则是拉伸为主的破坏形式,支架工作阻力不应低于14633kN;结果表明:龙王沟矿6号煤层综放面支架选用5.0m×2.05m型,额定工作阻力为15000k N(两柱掩护式),支护强度为1.46MPa,额定初撑力为12000kN,平均增载系数为1.23,可以保证工作面安全推进。同时也为煤层地质条件类似的矿井生产实践提供了科学的参考依据。
[Abstract]:Longwanggou Coal Mine is located in the central and northern part of Zhunger Coalfield in Inner Mongolia Autonomous region, located in Xue Jiawan Town, Zhungeer Banner, Ordos City. The main coal seam is No. 6 coal seam, with a dip angle of 0 掳and 5 掳, an average burial depth of 354m, a mining thickness of 4.00 mb ~ (30.10) m and an average of 20 m. The coal is single, the gangue intercalation is 0.32, and the lithology is dominated by mudstone. The roof is mainly composed of sandy mudstone and siltstone, and the bottom plate is mainly composed of sandy mudstone and mudstone. This paper takes the geological conditions of Longwanggou coal mine as the background. Firstly, according to the coal seam burial depth, coal body strength and thickness, joint fissure, roof condition, mining caving ratio and coal caving mouth size position, it is concluded that the caving ability of coal seam No. 6 is general. Secondly, by using the physical similar material simulation experiment method, it is concluded that the direct roof follows with the mining in the initial mining period, and the pressure step distance of the main roof cycle is 14 m or 37 m (average 23 m / m). With the advance, "cantilever beam" appears in the upper strata of the working face, and the formation of the "masonry beam" and the "cantilever beam" occur. Instability and alternating structure are the causes of periodic pressure of fully mechanized top coal caving face. At the same time the bearing pressure increases and the peak value is between 9.2MPa~11.7MPa. Through numerical simulation and theoretical calculation, it is concluded that the square roof on the coal face wall is the composite failure of shear and tension, and the roof above the goaf is the main failure form of tension. The working resistance of the support should not be lower than 14633kN.The results show that the support of fully mechanized caving face of No. 6 coal seam in Longwanggou Coal Mine is 5.0m 脳 2.05m. The rated working resistance is 15000kN (cover type of two columns, support strength is 1.46MPa, rated initial support force is 12000kN, average load increasing coefficient is 1.23), which can ensure safe advance of working face. At the same time, it also provides a scientific reference for coal mine production practice with similar geological conditions.
【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

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