特大型高瓦斯矿井综放工作面瓦斯治理数值模拟研究

发布时间：2018-04-25 04:18

  本文选题：高瓦斯 + 三维数值模拟　； 参考：《太原理工大学》2013年硕士论文

【摘要】：本文针对大同煤矿集团公司大唐塔山煤矿随着煤矿开拓延伸和采掘工作面生产能力的提高,综放工作面瓦斯涌出量不断增大的情况,分析了当前综放工作面瓦斯治理方案“U+I”型通风方式存在上隅角瓦斯超限的问题,根据本矿井现有巷道及地质情况,以8105工作面为研究背景,提出了“W+I”型通风方式。根据矿井空气流动理论,采用有限元分析软件Comsol Multiphysics的计算流体力学CFD模块的数值计算方法,分析了两进风巷(2105巷道和5105巷道)的进风量一样(方案一)和不一样(方案二)两种工况下的8105工作面通风以及瓦斯浓度,确定采用方案一的通风方式及设计风量。同时由于通风方式的改变,将在8105工作面中部开掘一条中部回风顺槽,顺槽设计长度476m。由于8105工作面中部回风顺槽处于8105工作面的中部,位于该工作面的高应力集中区域,由于该巷道的开掘,使得中部应力进行了又一次的重新分布和叠加,处于回采面与中部回风巷相交处的围岩应力分布极为复杂；受回采动压的影响,使得相交段巷道支护也变得复杂。如何保证该巷道在回采过程中的稳定性是8105工作面安全生产的前提。因此,本文在矿方提供的巷道断面及支护参数的基础上,分析8105工作面中部回风顺槽围岩的应力分布情况及围岩位移及破坏特征,在原巷道支护参数的基础上提出合理的巷道支护方式及支护参数。主要成果包括以下三个方面： 一、通过分析当前8105工作面通风方式的基础上,得出了影响工作面瓦斯超限的三个主要因素：一是特厚煤层高强度综放开采工艺瞬间落煤量大造成的瓦斯瞬间大量涌出；二是放顶煤工艺对采空区造成扰动致使瓦斯从采空区溢出；三是工作面来压将采空区积聚的大量瓦斯挤出到工作面。根据塔山矿实际情况,结合当前较为成熟的各种工作面通风方式特点,我们提出了以下三种方案对当前工作面通风方式进行优化,分别为：“W+I”型、“双U”型、“两进三回”型。经方案比选,最终确定工作面通风方式采用“W+I”型。 二、采用Comsol Multiphysics软件对两进风巷(2105巷道和5105巷道)的进风量一样(方案一)和不一样(方案二)两种工况下的8105工作面通风以及瓦斯浓度进行了分析。结果表明：两种工况都会使回采工作面巷与2105、中部回风巷、5105巷道交叉处存在强涡流现象,使得此处瓦斯浓度过高,为1.2%左右,超过矿井预警值1%,需引起重视。其他部位尚未见瓦斯浓度超标。由于方案二中2105巷比5105巷设计风量较大,伴随压差的影响,使得与5105巷以及与其相接的回采工作面风流呈现全断面强紊流状况,风流流向较乱,瓦斯在此处易形成聚集,对矿井安全生产造成一定影响。所以建议采用方案一的通风方式及设计风量。 三、通过数值计算分析,8105工作面中部回风顺槽最易发生失稳破坏的区域是中部回风顺槽巷帮5m范围内和工作面前方15m范围内所包括的区域。8105工作面采动影响较大的范围为工作面前方50m范围内,所以8105工作面中部回风顺槽需超前支护的距离确定为60m。 该论文有图69幅,表7个,参考文献50篇。
[Abstract]:On the basis of the mine air flow theory , the ventilation and gas concentration of 8105 working face in the coal mine are analyzed . According to the mine air flow theory , the ventilation mode and the design air quantity are analyzed by using the finite element analysis software Comsol Multiphysics . At the same time , the middle part of the working face is excavated by using the finite element analysis software Comsol Multiphysics .
Based on the roadway section and supporting parameters provided by the mine , this paper analyzes the stress distribution of the surrounding rock in the middle of the 8105 working face and the surrounding rock displacement and damage characteristics , and puts forward the reasonable roadway support and supporting parameters on the basis of the supporting parameters of the original roadway . The main results include the following three aspects :

1 . Based on the analysis of the ventilation mode of the current 8105 working face , three main factors which affect the gas overrun of the working face are obtained : firstly , the gas burst which is caused by the large amount of coal burst during the high - strength fully mechanized coal caving mining process of the special - thick coal seam ;
secondly , the caving coal process causes the disturbance of the mined - out area to cause the gas to overflow from the mined - out area ;
Based on the actual situation of Tashan Mine and combining the characteristics of various working face ventilation modes , we put forward the following three schemes : " W + I " type , " double U " type , " two - in - three - return " type , and the " W + I " type is adopted to determine the ventilation mode of the working face .

The ventilation and gas concentration of 8105 working face under two working conditions are as follows : ( 1 ) The gas concentration is too high , which is about 1.2 % , which exceeds 1 % of mine warning value .

3 . Through the numerical calculation analysis , the most vulnerable area in the middle of the 8105 working face is the area which is located within the 5m range of the middle return duct and 15m in front of the working face . The influence of the mining operation on the working face of the 8105 working face is within 50m of the working face . Therefore , the distance between the middle of the 8105 working face and the forward support is determined to be 60m .

There are 69 , 7 and 50 references in this paper .

【学位授予单位】：太原理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD712
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本文编号：1799722