本文選題：沿空掘巷　切入點(diǎn)：窄煤柱　出處：《湖南科技大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：沿空掘巷作為煤礦回采巷道的一種主要布置形式,正被廣泛的應(yīng)用于各類(lèi)煤礦。沿空巷道窄煤柱的穩(wěn)定性及巷道支護(hù)技術(shù)的研究也是國(guó)內(nèi)外學(xué)者關(guān)注的難點(diǎn)。本文以曲江礦603工作面回風(fēng)巷為工程背景,采用理論分析、數(shù)值模擬以及現(xiàn)場(chǎng)試驗(yàn)相結(jié)合的方法,分析了沿空掘巷基本頂破斷對(duì)窄煤柱穩(wěn)定性的影響,并對(duì)沿空巷道支護(hù)技術(shù)進(jìn)行了全面的研究。建立沿空巷道圍巖結(jié)構(gòu)力學(xué)模型,運(yùn)用力學(xué)理論推導(dǎo)出基本頂五種不同破斷位置時(shí)煤柱荷載的計(jì)算公式�？芍鰪�(qiáng)實(shí)體煤幫支護(hù)強(qiáng)度,減小巷道高度,可減小煤柱的變形。通過(guò)比較可知:基本頂斷裂關(guān)鍵塊不能形成鉸接結(jié)構(gòu)時(shí),煤柱變形最小;若基本頂斷裂時(shí)關(guān)鍵塊形成鉸接結(jié)構(gòu),關(guān)鍵塊B斷裂于煤柱外側(cè)時(shí)對(duì)巷道圍巖穩(wěn)定性最有利,斷裂于巷道上方時(shí)對(duì)巷道圍巖穩(wěn)定性最不利。運(yùn)用UDEC軟件模擬了五種破斷位置時(shí)窄煤柱變形情況及應(yīng)力特征,并分析了窄煤柱寬度、基本頂厚度、巷道高度以及直接頂厚度對(duì)窄煤柱穩(wěn)定性的影響。五種不同破斷位置時(shí)窄煤柱變形程度從小到大依次為:煤柱外側(cè)(不形成鉸接結(jié)構(gòu)),煤柱外側(cè),實(shí)體煤上方,窄煤柱上方,巷道上方。總結(jié)了曲江礦沿空掘巷圍巖破壞的幾種表現(xiàn)形式;提出采用高預(yù)應(yīng)力桁架錨索梁的支護(hù)方式,并分析了桁架錨索梁的支護(hù)機(jī)理和沿空掘巷巷道的支護(hù)原理,采用桁架錨索梁支護(hù)后巷道圍巖的變形得到了有效的控制。結(jié)合數(shù)值模擬和理論計(jì)算方法分別對(duì)煤柱合理寬度進(jìn)行計(jì)算,經(jīng)過(guò)對(duì)比分析最終優(yōu)選出5m為最合理的寬度;現(xiàn)場(chǎng)實(shí)測(cè)推斷曲江礦603工作面基本頂破斷位置在窄煤柱外側(cè);根據(jù)曲江礦603工作面回風(fēng)巷道的實(shí)際情況,在原支護(hù)方案基礎(chǔ)上針對(duì)性的提出在頂板采用“錨桿(索)+金屬網(wǎng)+桁架錨索梁”聯(lián)合支護(hù),窄煤柱幫采用“錨桿+金屬網(wǎng)+桁架錨索梁”聯(lián)合支護(hù),實(shí)體煤幫則采用“錨桿+金屬網(wǎng)+梯子梁”的支護(hù)方法,該方案在現(xiàn)場(chǎng)取得了良好的支護(hù)效果。
[Abstract]:As one of the main layout forms of mining roadway along goaf, It is widely used in all kinds of coal mines. The stability of narrow pillar along goaf roadway and the research of roadway support technology are also the difficulties concerned by scholars at home and abroad. This paper takes the return air roadway of No. 603 face of Qujiang Mine as the engineering background and adopts theoretical analysis. Combined with numerical simulation and field test, this paper analyzes the influence of the breakage of roadway along goaf on the stability of narrow coal pillar, and makes a comprehensive study on the supporting technology of roadway along goaf, and establishes the structural mechanics model of surrounding rock along goaf roadway. Based on the mechanical theory, the formulas for calculating the load of coal pillar at five different breaking positions of the basic roof are derived. It is known that the support strength of solid coal side is enhanced and the height of roadway is reduced. The deformation of coal pillar can be reduced by comparison: when the key block of basic top fracture can not form hinged structure, the deformation of coal pillar is minimum; if the key block of basic top fracture forms hinge structure, The stability of roadway surrounding rock is most favorable when the key block B fracture is outside the coal pillar and the most disadvantageous to the surrounding rock stability of roadway when the fault is above the roadway. The deformation and stress characteristics of narrow coal pillar in five broken positions are simulated by UDEC software. The width and the basic top thickness of the narrow coal pillar are analyzed. The influence of roadway height and direct top thickness on the stability of narrow coal pillar. The deformation degree of narrow coal pillar changes from small to large in order of five different breaking positions: outside of coal pillar (without hinged structure, outside coal pillar, above solid coal and above narrow coal pillar). Above the roadway, this paper summarizes several forms of failure of surrounding rock along the goaf roadway in Qujiang Mine, puts forward the supporting mode of high prestressed truss anchor cable beam, and analyzes the supporting mechanism of truss anchor cable beam and the supporting principle of roadway along the goaf. The deformation of surrounding rock of roadway is controlled effectively by using truss anchor cable beam support. The reasonable width of coal pillar is calculated by numerical simulation and theoretical calculation method. Through comparison and analysis, 5 m is selected as the most reasonable width. It is inferred that the breaking position of 603 face in Qujiang Coal Mine is outside the narrow pillar, and according to the actual situation of return air roadway in 603 face of Qujiang Coal Mine, Based on the original support scheme, the combined support of "anchor rod (cable) metal mesh truss cable beam" and "anchor rod metal mesh truss anchor cable beam" is put forward in the roof, and the narrow coal pillar side is supported by "anchor rod metal mesh truss anchor cable beam". The solid coal side adopts the support method of "bolt metal mesh ladder beam", and the scheme has good support effect on the spot.
【學(xué)位授予單位】：湖南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TD353

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 秦永洋;許少東;楊張杰;;深井沿空掘巷煤柱合理寬度確定及支護(hù)參數(shù)優(yōu)化[J];煤炭科學(xué)技術(shù);2010年02期

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本文編號(hào)：1597674