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

【摘要】：本文針對(duì)大同煤礦集團(tuán)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(dāng)前綜放工作面瓦斯治理方案“U+I”型通風(fēng)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(fēng)方式。根據(jù)礦井空氣流動(dòng)理論,采用有限元分析軟件Comsol Multiphysics的計(jì)算流體力學(xué)CFD模塊的數(shù)值計(jì)算方法,分析了兩進(jìn)風(fēng)巷(2105巷道和5105巷道)的進(jìn)風(fēng)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(fēng)以及瓦斯?jié)舛?確定采用方案一的通風(fēng)方式及設(shè)計(jì)風(fēng)量。同時(shí)由于通風(fēng)方式的改變,將在8105工作面中部開掘一條中部回風(fēng)順槽,順槽設(shè)計(jì)長(zhǎng)度476m。由于8105工作面中部回風(fēng)順槽處于8105工作面的中部,位于該工作面的高應(yīng)力集中區(qū)域,由于該巷道的開掘,使得中部應(yīng)力進(jìn)行了又一次的重新分布和疊加,處于回采面與中部回風(fēng)巷相交處的圍巖應(yīng)力分布極為復(fù)雜；受回采動(dòng)壓的影響,使得相交段巷道支護(hù)也變得復(fù)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(hù)參數(shù)的基礎(chǔ)上,分析8105工作面中部回風(fēng)順槽圍巖的應(yīng)力分布情況及圍巖位移及破壞特征,在原巷道支護(hù)參數(shù)的基礎(chǔ)上提出合理的巷道支護(hù)方式及支護(hù)參數(shù)。主要成果包括以下三個(gè)方面： 一、通過分析當(dāng)前8105工作面通風(fēng)方式的基礎(chǔ)上,得出了影響工作面瓦斯超限的三個(gè)主要因素：一是特厚煤層高強(qiáng)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(duì)采空區(qū)造成擾動(dòng)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(shí)際情況,結(jié)合當(dāng)前較為成熟的各種工作面通風(fēng)方式特點(diǎn),我們提出了以下三種方案對(duì)當(dāng)前工作面通風(fēng)方式進(jìn)行優(yōu)化,分別為：“W+I”型、“雙U”型、“兩進(jìn)三回”型。經(jīng)方案比選,最終確定工作面通風(fēng)方式采用“W+I”型。 二、采用Comsol Multiphysics軟件對(duì)兩進(jìn)風(fēng)巷(2105巷道和5105巷道)的進(jìn)風(fēng)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(fēng)以及瓦斯?jié)舛冗M(jìn)行了分析。結(jié)果表明：兩種工況都會(huì)使回采工作面巷與2105、中部回風(fēng)巷、5105巷道交叉處存在強(qiáng)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(yù)警值1%,需引起重視。其他部位尚未見瓦斯?jié)舛瘸瑯?biāo)。由于方案二中2105巷比5105巷設(shè)計(jì)風(fēng)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(fēng)流呈現(xiàn)全斷面強(qiáng)紊流狀況,風(fēng)流流向較亂,瓦斯在此處易形成聚集,對(duì)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(fēng)方式及設(shè)計(jì)風(fēng)量。 三、通過數(shù)值計(jì)算分析,8105工作面中部回風(fēng)順槽最易發(fā)生失穩(wěn)破壞的區(qū)域是中部回風(fēng)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(dòng)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(fēng)順槽需超前支護(hù)的距離確定為60m。 該論文有圖69幅,表7個(gè),參考文獻(xiàn)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(xué)位授予單位】：太原理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TD712
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本文編號(hào)：1799722