潘一矿1551（1）工作面采空区瓦斯抽采系统优化

发布时间：2019-04-15 20:26

【摘要】：近年来,随着煤矿开采量的增加,我国煤矿开采逐渐趋于深部开采,再加上我国煤层地质条件的复杂性,造成了煤矿灾害事故的频发。其中,瓦斯灾害占矿井灾害事故的绝大部分。因此,在煤矿生产过程中,瓦斯的有效治理、降低瓦斯浓度是提高矿井安全高效生产的必要手段。本文以潘一矿1551(1)工作面采空区为研究对象,对工作面瓦斯来源进行了分析,其中采空区的瓦斯涌出量占回采面瓦斯涌出量的60%以上；因此,在煤层回采中有必要解决采空区瓦斯问题。现如今解决采空区瓦斯的有效措施是进行采空区瓦斯抽采。根据潘一矿1551(1)工作面及其采空区的具体实际情况,并依据其煤层地质条件及上覆煤岩物理特性,运用FLAC3D软件对采空区上覆岩层建立数值模型,通过运算可以直观地看出采空区上覆岩层的裂隙发育情况以及上覆岩层的应力分布规律。通过对模拟结果分析,大致可以得出上覆岩层冒落带和裂隙带的范围。结果显示,模拟的结果和计算得出的冒落带发育高度和裂隙带发育高度大致相同。然后运用Fluent软件对采空区内瓦斯仅在通风条件下的运移情况进行模拟分析。得到沿工作面走向方向采空区瓦斯浓度变化规律及采空区竖直方向浓度的变化规律；同时,得到漏风对采空区瓦斯浓度分布的影响。最后根据对采空区上覆岩层裂隙发育情况及采空区瓦斯分布规律的研究,确定采空区瓦斯的抽采方式及抽采钻孔的布置。为采空区瓦斯的治理提供参考依据。
[Abstract]:In recent years, with the increase of coal mining, coal mining in our country gradually tends to deep mining, coupled with the complexity of the geological conditions of coal seam in China, resulting in the frequent occurrence of coal mine disasters. Among them, gas disaster accounts for the vast majority of mine disaster accidents. Therefore, in the process of coal mine production, the effective control of gas and the reduction of gas concentration are the necessary means to improve the safety and efficiency of mine production. Taking the goaf of 1551 (1) face in Panyi Coal Mine as the research object, this paper analyzes the gas source of the working face, in which the gas emission in the goaf accounts for more than 60% of the gas emission in the mining face; Therefore, it is necessary to solve the gas problem in goaf in coal seam recovery. Now the effective measure to solve goaf gas is to carry out goaf gas drainage. According to the actual situation of 1551 (1) working face and goaf of Panyi Coal Mine, and according to the geological conditions of coal seam and the physical characteristics of overlying coal and rock, the numerical model of overlying strata in goaf is established by using FLAC3D software. The development of cracks in overlying strata and the stress distribution of overlying strata can be seen intuitively through the calculation. Through the analysis of the simulation results, the scope of overlying strata fall zone and fracture zone can be roughly obtained. The results show that the simulated results are approximately the same as the calculated height of the development of the caving zone and that of the fissured zone. Then Fluent software is used to simulate and analyze the gas migration in goaf under ventilation condition. The variation law of gas concentration in goaf along the strike direction of working face and vertical concentration in goaf are obtained, and the influence of air leakage on gas concentration distribution in goaf is also obtained. Finally, according to the research on the development of the cracks in the overlying strata of goaf and the gas distribution in the goaf, the way of gas extraction and the arrangement of drilling holes in goaf are determined. It provides reference basis for gas control in goaf.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TD712.6

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