本文選題：急傾斜厚煤層 + 巷道支護(hù)��； 參考：《山東科技大學(xué)》2017年碩士論文

【摘要】：相較于水平及緩傾斜煤層,急傾斜厚煤層的賦存及開(kāi)采條件更復(fù)雜,巷道支護(hù)技術(shù)是急斜特厚煤層安全高效開(kāi)采亟需研究的重要課題之一。針對(duì)柴達(dá)爾煤礦特殊的地質(zhì)條件和回采巷道變形特征,采用地質(zhì)勘探、理論分析、力學(xué)分析、相似材料模擬試驗(yàn)、數(shù)值模擬和現(xiàn)場(chǎng)監(jiān)測(cè)相結(jié)合的方法,主要研究了柴達(dá)爾煤礦204采區(qū)分段工作面回采巷道變形規(guī)律和支護(hù)技術(shù),得到以下結(jié)論和認(rèn)識(shí):(1)根據(jù)急傾斜厚煤層開(kāi)采研究現(xiàn)狀,結(jié)合柴達(dá)爾煤礦急傾斜厚煤層特點(diǎn),總結(jié)了急傾斜厚煤層分段工作面回采巷道圍巖穩(wěn)定性影響因素,分析了急傾斜厚煤層回采巷道圍巖失穩(wěn)過(guò)程。運(yùn)用“跨層拱”力學(xué)模型,計(jì)算了在煤層傾角一定的情況下,回采巷道所受疊加應(yīng)力分別與采深和拱跨的關(guān)系,發(fā)現(xiàn)“跨層拱”拱跨越長(zhǎng)、采深越大疊加應(yīng)力就越大。(2)運(yùn)用相似材料模擬試驗(yàn)的方法,首先研究了首分段和第五分段工作面回采巷道隨工作面推進(jìn)的應(yīng)力演化規(guī)律,回采巷道圍巖的應(yīng)力隨著首分段工作面開(kāi)采先增加后減小,回采巷道中運(yùn)輸巷頂板受到的應(yīng)力較大,回風(fēng)巷左幫所受應(yīng)力較大;研究了急傾斜厚煤層分段工作面頂?shù)装宓目迓涮卣骷绊斆旱倪\(yùn)移規(guī)律,頂板垮落有一定的周期性和滯后性,下分段的開(kāi)采會(huì)引起已采分段形成的垮落煤巖體的滑落,形成一個(gè)陷落的“漏斗”;研究了第五分段巷道圍巖隨工作面開(kāi)采的受力特征,發(fā)現(xiàn)回采巷道受到的應(yīng)力整體比首分段巷道圍巖高。(3)運(yùn)用數(shù)值模擬的方法,分析了工作面圍巖應(yīng)力隨分段工作面開(kāi)采深度的增加的變化特征,研究了不同方案下第五分段工作面回采巷道圍巖應(yīng)力和位移隨工作面推進(jìn)的動(dòng)態(tài)變化規(guī)律。研究發(fā)現(xiàn):下分段回采巷道圍巖受本身和上分段回采影響產(chǎn)生應(yīng)力疊加,巷道圍巖應(yīng)力隨著工作面的推進(jìn)先增加后減小;回采巷道水平和垂直應(yīng)力比較突出,巷道頂部、內(nèi)側(cè)幫部和角部是頂板側(cè)巷道應(yīng)力集中的重點(diǎn)區(qū)域;回采巷道中頂板運(yùn)輸巷圍巖變形量大于底板回風(fēng)巷。(4)運(yùn)用工程實(shí)踐的方法對(duì)數(shù)值模擬得出的優(yōu)選方案進(jìn)行驗(yàn)證,確定了相關(guān)支護(hù)參數(shù),有效控制了圍巖變形,取得了良好的應(yīng)用效果。研究結(jié)果對(duì)于指導(dǎo)急傾斜厚煤層分段工作面回采巷道支護(hù)技術(shù)的研究具有一定意義。
[Abstract]:Compared with horizontal and gently inclined coal seams, the occurrence and mining conditions of steeply inclined thick coal seams are more complicated. Roadway support technology is one of the most important issues that need to be studied in the safe and efficient mining of steep and super-thick coal seams. In view of the special geological conditions and the deformation characteristics of mining roadway in Qaidar Coal Mine, the methods of combining geological exploration, theoretical analysis, mechanical analysis, similar material simulation test, numerical simulation and on-site monitoring are adopted. This paper mainly studies the deformation law and support technology of roadway in Chaidar coal mine area 204 mining area, and obtains the following conclusions and cognition) according to the present situation of mining research on steeply inclined thick coal seam, combined with the characteristics of steeply inclined thick coal seam in Chaidar coal mine, This paper summarizes the influence factors of surrounding rock stability of mining roadway in steeply inclined thick coal seam and analyzes the instability process of mining roadway surrounding rock in steeply inclined thick coal seam. By using the mechanical model of "cross layer arch", the relationship between the superimposed stress of mining roadway and the depth of mining and arch span is calculated under the condition of certain seam inclination angle, and the span length of "cross layer arch" arch is found. The larger the mining depth, the greater the superposition stress. (2) by using the method of similar material simulation test, the stress evolution law of the mining roadway in the first section and the fifth section with the advance of the working face is studied. The stress of surrounding rock of mining roadway increases first and then decreases with the mining of the first section of the face. The stress of the roof of the transport roadway in the mining roadway is greater than that of the left side of the return air roadway. This paper studies the caving characteristics of roof and floor in steeply inclined thick coal seam and the migration law of top coal. The roof caving has certain periodicity and hysteresis, and the mining of the next section will cause the caving rock mass to fall. Forming a "funnel" of caving, studying the mechanical characteristics of surrounding rock in the fifth section roadway with the mining face, finding that the stress in the mining roadway is higher than that in the surrounding rock of the first section roadway, and using the method of numerical simulation. The variation characteristics of surrounding rock stress with the increase of mining depth in working face are analyzed, and the dynamic variation law of surrounding rock stress and displacement of roadway in the fifth section face with the advance of working face is studied under different schemes. It is found that the surrounding rock of the next sublevel mining roadway is superimposed by itself and the upper section of the roadway, the surrounding rock stress of the roadway increases first and then decreases with the advance of the working face, the horizontal and vertical stresses of the mining roadway are prominent, and the top of the roadway, The inner side and corner are the key areas of stress concentration in roof side roadway, and the surrounding rock deformation of roof transport roadway in mining roadway is larger than that of bottom slab return air tunnel. 4) the optimal selection scheme obtained by numerical simulation is verified by engineering practice. The parameters of supporting are determined, and the deformation of surrounding rock is effectively controlled, and good application effect is obtained. The research results have certain significance for guiding the research of mining roadway support technology in steeply inclined thick coal seam.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD353

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