赵庄矿下组煤带压开采条件评价

发布时间：2018-06-03 10:00

本文选题：下组煤 + 底板破坏深度　；参考：《华北科技学院》2017年硕士论文

【摘要】：我国煤炭资源储量非常丰富,煤炭消费占我国一次能源消费总量的68%。随着我国浅部煤炭资源的日益枯竭,矿井深度不断延伸,下部煤层开采过程中受到底板奥陶系灰岩水的威胁日益加大。因此,如何解决下部煤层的带压开采问题,对矿井安全生产有重要意义。由于赵庄矿上部煤炭资源已不足以维持矿井正常生产的需要,因此急需开采下组15#煤层,而15#煤层距底板奥灰含水层较近,局部地区不足20米,且奥灰水水压较大。因此,本论文通过收集赵庄矿地质及钻孔资料,对下组15#煤层底板隔水层的厚度、空间展布特征及其隔水性能进行分析评价;利用FLAC-3D数值模拟软件和经验公式,得出15#煤开采过程中的底板岩体破坏深度和奥灰承压水的导升高度,并分析15#煤底板有效隔水层厚度及其空间展布特征;最后计算赵庄矿15#煤底板奥灰突水系数,对下组15#煤带压开采条件进行评价。主要研究成果如下:(1)通过对奥灰岩性及现场钻孔资料进行分析,可知奥灰峰峰组顶部存在30m左右的相对隔水层;15#煤底板隔水层厚度在38.75~67.25m之间,平均厚度为57m,且隔水性能较好。(2)综合FLAC-3D数值模拟和经验公式计算结果,得到15煤底板破坏深度为28m,奥灰承压水导升高度为7m。15#煤底板有效隔水层厚度在25.32~75.3m之间。(3)15#煤底板奥灰突水系数sT在/1.0~003.0mMPa之间,因此,将整个井田划分成两个区域,即安全区(TmMPaS/06.0)、危险区(MPaTmMPamS/1.0/06.0)。
[Abstract]:China's coal reserves are very rich, coal consumption accounts for the total amount of primary energy consumption 68. With the depletion of shallow coal resources and the continuous extension of mine depth in China, the lower coal seam is threatened by the limestone water of Ordovician system in the process of mining. Therefore, how to solve the problem of pressure mining in the lower coal seam is of great significance to mine safety production. Because the coal resources of the upper part of Zhaozhuang Mine are not enough to maintain the normal production of the mine, it is urgent to mine the 15# coal seam of the lower formation, which is close to the Ordovician Aquifer on the floor, less than 20 meters in the local area, and the water pressure of the Ordovician ash is high. Therefore, by collecting geological and borehole data of Zhaozhuang Coal Mine, this paper analyzes and evaluates the thickness, spatial distribution characteristics and water insulation performance of the bottom water barrier layer of No. 15 coal seam in the lower formation, and makes use of FLAC-3D numerical simulation software and empirical formula. The failure depth of floor rock mass and the height of water conductivity of Ordovician confined water during coal mining of No. 15 # coal are obtained, and the thickness of effective water-insulating layer of coal floor and its spatial distribution characteristics are analyzed. Finally, the water inrush coefficient of Ordovician ash in 15# coal floor of Zhaozhuang Coal Mine is calculated. The pressure mining conditions of No. 15 # coal in the lower group were evaluated. The main research results are as follows: (1) by analyzing the characteristics of Ordovician limestone and site drilling data, it can be seen that there are about 30 m relative water-separating layer at the top of the Ordovician peak formation, and the thickness of the water-proof layer of coal floor No. 15 # is between 38.75 and 67.25 m. The average thickness is 57 m, and the water insulation is good. 2) the results of FLAC-3D numerical simulation and empirical formula are synthesized. It has been obtained that the failure depth of 15 coal floor is 28m, and the height of water conductivity of Ordovician confined pressure is between 25.32 ~ 75.3 m and 25.32 ~ 75.3m. The coefficient of water inrush of Ordovician ash of coal floor is between 1.0 and 0.03.0 mMPa. Therefore, the whole mine field is divided into two regions. That is, the safety zone is TmMPA S / 06.0, and the dangerous area is MPA TmMPam S / 1. 0 / 06.0.
【学位授予单位】：华北科技学院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD823

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