發(fā)布時間：2018-04-25 04:18

  本文選題：高瓦斯 + 三維數(shù)值模擬　； 參考：《太原理工大學》2013年碩士論文

【摘要】：本文針對大同煤礦集團公司大唐塔山煤礦隨著煤礦開拓延伸和采掘工作面生產(chǎn)能力的提高,綜放工作面瓦斯涌出量不斷增大的情況,分析了當前綜放工作面瓦斯治理方案“U+I”型通風方式存在上隅角瓦斯超限的問題,根據(jù)本礦井現(xiàn)有巷道及地質(zhì)情況,以8105工作面為研究背景,提出了“W+I”型通風方式。根據(jù)礦井空氣流動理論,采用有限元分析軟件Comsol Multiphysics的計算流體力學CFD模塊的數(shù)值計算方法,分析了兩進風巷(2105巷道和5105巷道)的進風量一樣(方案一)和不一樣(方案二)兩種工況下的8105工作面通風以及瓦斯?jié)舛?確定采用方案一的通風方式及設計風量。同時由于通風方式的改變,將在8105工作面中部開掘一條中部回風順槽,順槽設計長度476m。由于8105工作面中部回風順槽處于8105工作面的中部,位于該工作面的高應力集中區(qū)域,由于該巷道的開掘,使得中部應力進行了又一次的重新分布和疊加,處于回采面與中部回風巷相交處的圍巖應力分布極為復雜；受回采動壓的影響,使得相交段巷道支護也變得復雜。如何保證該巷道在回采過程中的穩(wěn)定性是8105工作面安全生產(chǎn)的前提。因此,本文在礦方提供的巷道斷面及支護參數(shù)的基礎上,分析8105工作面中部回風順槽圍巖的應力分布情況及圍巖位移及破壞特征,在原巷道支護參數(shù)的基礎上提出合理的巷道支護方式及支護參數(shù)。主要成果包括以下三個方面： 一、通過分析當前8105工作面通風方式的基礎上,得出了影響工作面瓦斯超限的三個主要因素：一是特厚煤層高強度綜放開采工藝瞬間落煤量大造成的瓦斯瞬間大量涌出；二是放頂煤工藝對采空區(qū)造成擾動致使瓦斯從采空區(qū)溢出；三是工作面來壓將采空區(qū)積聚的大量瓦斯擠出到工作面。根據(jù)塔山礦實際情況,結(jié)合當前較為成熟的各種工作面通風方式特點,我們提出了以下三種方案對當前工作面通風方式進行優(yōu)化,分別為：“W+I”型、“雙U”型、“兩進三回”型。經(jīng)方案比選,最終確定工作面通風方式采用“W+I”型。 二、采用Comsol Multiphysics軟件對兩進風巷(2105巷道和5105巷道)的進風量一樣(方案一)和不一樣(方案二)兩種工況下的8105工作面通風以及瓦斯?jié)舛冗M行了分析。結(jié)果表明：兩種工況都會使回采工作面巷與2105、中部回風巷、5105巷道交叉處存在強渦流現(xiàn)象,使得此處瓦斯?jié)舛冗^高,為1.2%左右,超過礦井預警值1%,需引起重視。其他部位尚未見瓦斯?jié)舛瘸瑯�。由于方案二�?105巷比5105巷設計風量較大,伴隨壓差的影響,使得與5105巷以及與其相接的回采工作面風流呈現(xiàn)全斷面強紊流狀況,風流流向較亂,瓦斯在此處易形成聚集,對礦井安全生產(chǎn)造成一定影響。所以建議采用方案一的通風方式及設計風量。 三、通過數(shù)值計算分析,8105工作面中部回風順槽最易發(fā)生失穩(wěn)破壞的區(qū)域是中部回風順槽巷幫5m范圍內(nèi)和工作面前方15m范圍內(nèi)所包括的區(qū)域。8105工作面采動影響較大的范圍為工作面前方50m范圍內(nèi),所以8105工作面中部回風順槽需超前支護的距離確定為60m。 該論文有圖69幅,表7個,參考文獻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 .

【學位授予單位】：太原理工大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：TD712
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本文編號：1799722