本文選題：底板破壞機(jī)理　切入點(diǎn)：運(yùn)輸順槽　出處：《西安科技大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：矩形巷道底板破壞機(jī)理與支護(hù)研究是煤礦建設(shè)和生產(chǎn)中的重要課題之一。本文以蔣家河煤礦ZF204運(yùn)輸順槽為工程背景,采用現(xiàn)場實(shí)測、物理模擬、數(shù)值模擬與理論分析等方法,研究巷道底板破壞機(jī)理和支護(hù)方案確定。(1)通過物理相似模擬,可以得出ZF204運(yùn)輸順槽破壞,主要巷幫下沉開始的,幫腳破壞,底板受巷幫壓力隆起。巷幫破壞引起圍巖極限平衡拱增大,巷幫與頂板原支護(hù)效果降低,幫部發(fā)生片幫,下幫破壞比較嚴(yán)重,出現(xiàn)煤體破碎,下幫錨桿支護(hù)失效,頂板發(fā)生離層破壞,頂板下沉,出現(xiàn)網(wǎng)兜現(xiàn)象。(2)建立巷道底板破壞力學(xué)模型,計(jì)算出不考慮底板自重和考慮底板自重情況下巷道兩幫底板極限承載力,繪制極限承載力與巷道底板內(nèi)聚力和內(nèi)摩擦角的變化曲線。內(nèi)摩擦角一定時(shí),巷道兩幫底板極限承載力與內(nèi)聚力成一次線性關(guān)系,內(nèi)摩擦角越大,對(duì)應(yīng)巷道極限承載力與內(nèi)聚力所成斜率越大;內(nèi)聚力一定時(shí),內(nèi)摩擦角越小,極限承載力越小,極限承載力隨著內(nèi)摩擦角的減小,剛開始降低的比較快,之后緩慢降低,趨于穩(wěn)定。(3)通過巷道底板破壞范圍進(jìn)行分析,得出φ值一定時(shí),底板巖體幫腳破壞深度hbd和底板最大破壞深度hd max與煤幫破壞深度L成線性增長關(guān)系。若L1max+l2maxW0,W0為巷道開挖寬度,巷道底板成“W”破壞;若llmax+l2max≥W0,巷道底板成拱形破壞,巷道底板破壞對(duì)兩幫和頂板穩(wěn)定性具有顯著影響,采用“極限平衡圈”理論計(jì)算出底板破壞引起頂板破壞最大值。(4)巷道極限平衡圈支護(hù)條件下,運(yùn)輸順槽底板極限承載力為23.42MPa,底板最大破壞深度為3.57m,兩幫腳底板破壞深度為1.67m,底板破壞引起巷幫破壞深度為1.52m,頂板自然平衡拱高為3.24m,極限平衡拱高為5.45m,選用錨網(wǎng)索+底錨方案。
[Abstract]:The research on the failure mechanism and support of rectangular roadway floor is one of the important topics in coal mine construction and production. This paper takes Jiangjiahe coal mine ZF204 transportation channel as the engineering background, adopts the methods of field measurement, physical simulation, numerical simulation and theoretical analysis, etc. By studying the failure mechanism of roadway floor and determination of supporting scheme. 1) through the physical similarity simulation, it can be concluded that the ZF204 transport failure along the channel, the main roadway side sinking begins, the help foot damage, The floor is uplifted by the pressure of the roadway side. The failure of the roadway side causes the increase of the ultimate equilibrium arch of the surrounding rock, the effect of the original support of the roadway and the roof is reduced, the slab of the side is damaged seriously, the coal body is broken, and the bolting support of the bottom side is invalid. The failure of the roof, the subsidence of the roof, the phenomenon of netting and the appearance of the phenomenon of net pocket.) the failure model of the roadway floor is established, and the ultimate bearing capacity of the two sides of the roadway is calculated when the weight of the floor is not considered and the weight of the floor is taken into account. When the angle of internal friction is fixed, the relationship between ultimate bearing capacity and cohesion of roadway floor is linear, and the angle of internal friction is larger. The slope corresponding to the ultimate bearing capacity and cohesion of the roadway is larger; the smaller the angle of internal friction is, the smaller the ultimate bearing capacity is when the cohesion force is fixed, the lower the ultimate bearing capacity is with the decrease of the angle of internal friction, the lower the ultimate bearing capacity is at first, and then the slowly decreasing. Through the analysis of the failure range of roadway floor, it is concluded that the depth of floor rock floor failure hbd and the maximum damage depth HD max of floor rock mass are linearly increased with the depth of coal side damage L when 蠁 is fixed. If L 1max L 2maxW 0 W 0 is the width of roadway excavation, the relation between the depth of floor rock mass failure and the depth of coal side damage L is linear. If llmax _ (l2max) 鈮，

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