赵庄矿大采高工作面瓦斯抽采技术研究

发布时间：2018-12-25 16:38

【摘要】：随着我国煤矿开采规模的不断加大,开采深度逐年加深,煤层相对瓦斯含量逐渐升高,瓦斯治理难度也进一步增大。在煤炭开采过程中,大采高综采工作面采煤厚度大、推进速度快、绝对瓦斯涌出量高；同时,对于大采高工作面采动扰动影响大,邻近层和采空区瓦斯容易涌入工作面,极易造成工作面在掘进和回采期间瓦斯积聚和瓦斯超限,给工作面瓦斯治理工作造成了严重的困难。如何治理大采高、高瓦斯、低透气性、推进速度快的工作面瓦斯成为了保障煤矿安全、高产、高效生产亟待解决的问题。论文针对赵庄矿高瓦斯煤层大采高超长工作面的条件,以1307工作面为例,应用理论分析、现场观测、数值模拟等方法对赵庄矿1307工作面上覆岩层运动规律、瓦斯运移规律及工作面瓦斯治理进行研究。以扩散定律及达西定律为基础,分析了1307工作面瓦斯在原始煤体以及卸压煤体中的运移规律,并以此为依据对1307工作面瓦斯涌出量进行预测。通过1307工作面瓦斯涌出量预测结果和现场实际情况确定瓦斯治理方案即：采用高抽巷+底抽巷+本煤层抽采方案对1307工作面瓦斯进行治理；采用本工作面的数值模拟和邻近工作面现场观测对比分析,确定1307工作面采空区的垮落带和裂隙带高度,以此确定高抽巷的层位以及距回风巷水平投影距离；通过本煤层预抽孔的现场实际情况对2#底抽巷的参数进行设计,为工作面无盲区预抽提供保障；经过工作面的初采效果分析得出,工作面和上隅角瓦斯浓度均达到预期目标。研究结果表明：大采高长工作面裂隙带高度远大于普通综采工作面,回采过程中更易使邻近层瓦斯涌入采空区。在晋城地区采用高抽巷+底抽巷+本煤层抽采的治理方法能有效地治理工作面的瓦斯问题。
[Abstract]:With the increasing scale of coal mining in our country, the mining depth deepens year by year, the relative gas content of coal seam increases gradually, and the difficulty of gas control is further increased. In the process of coal mining, the mining thickness of fully mechanized coal face with large mining height is large, the speed of advancing is fast, and the quantity of absolute gas emission is high. At the same time, for the large mining face mining disturbance, the adjacent strata and goaf gas is easy to pour into the face, it is easy to cause gas accumulation and gas over-limit during excavation and mining. To face gas control work caused serious difficulties. How to control the gas in the coal face with high mining height, high gas, low permeability and fast speed has become an urgent problem to be solved to ensure the safety, high yield and high efficiency of coal mine production. Aiming at the condition of the coal face with large mining height in Zhaozhuang coal mine, taking the 1307 face as an example, this paper applies the methods of theoretical analysis, field observation and numerical simulation to the movement law of the overlying strata in the 1307 face of Zhaozhuang Coal Mine. The law of gas migration and gas control in working face are studied. Based on the diffusion law and Darcy's law, the gas migration law of 1307 face in the original coal body and the pressure relief coal body is analyzed, and the gas emission quantity of the 1307 face is forecasted on the basis of the law of diffusion and Darcy's law. Through the gas emission prediction results of 1307 working face and the actual situation on the spot, the gas treatment scheme is determined, that is, adopting the high drainage roadway bottom drainage roadway this coal seam drainage scheme to control the gas in 1307 working face; The height of caving zone and fissure zone in goaf of 1307 face is determined by numerical simulation of this working face and field observation and comparative analysis of adjacent working face so as to determine the level of high extraction roadway and the horizontal projection distance from return air roadway. According to the actual situation of the coal seam pre-drainage, the parameters of the roadway are designed to provide protection for the pre-drainage of the face without blind area, and through the analysis of the initial mining effect of the working face, it is concluded that the gas concentration in the working face and the upper corner reach the expected goal. The results show that the height of fissure zone in the long face with large mining height is much higher than that in the general fully mechanized mining face, and it is easier to make the gas from the adjacent strata pour into the goaf during the mining process. In Jincheng area, the treatment method of high drainage roadway bottom drainage roadway and coal seam drainage can effectively control the gas problem in the working area.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD712.6

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