【摘要】：我國很多礦區(qū)都存在近距離煤層群采動影響底板巷道的穩(wěn)定問題,尤其是受跨采影響的底板巷道圍巖破壞機理復(fù)雜,支護困難,因此近距離跨采巷道穩(wěn)定性控制十分困難。底板巷道受近距離煤層群采動影響實際上是采動過程中的動靜壓交替作用下的巷道破壞問題,從而造成巷道維護困難,進而影響煤礦安全生產(chǎn)的重要原因之一。論文以仲恒煤礦10304采面傾斜長壁開采為工程背景,綜合運用室內(nèi)試驗、理論分析及數(shù)值模擬等手段,對大傾角直角梯形采場關(guān)鍵層破斷機理及傳播規(guī)律進行研究,探究了傾斜煤層采動影響的巷道圍巖壓力分布規(guī)律和傳播原理,實現(xiàn)巷道合理的分區(qū)段分層次支護。主要研究內(nèi)容及結(jié)論:利用彈性薄板理論建立了傾斜狀態(tài)下直角梯形薄板關(guān)鍵層力學(xué)模型,并采用康托洛維奇方法求解得到兩鄰邊固支兩鄰邊簡支直角梯形薄板關(guān)鍵層的彎曲下沉解析解和應(yīng)力分布表達(dá)式,對傾斜直角梯形關(guān)鍵層應(yīng)力演化規(guī)律進行理論分析,探討了工作面煤體應(yīng)力值的變化規(guī)律;運用PFC數(shù)值模擬研究,傾斜直角梯形采面底板的應(yīng)力分布規(guī)律及跨采底板裂隙發(fā)育規(guī)律。結(jié)果表明:底板應(yīng)力峰值集中在采面的中部附近,在高應(yīng)力區(qū)底板裂隙更為發(fā)育,結(jié)合底板與煤層距離的不同,建立力學(xué)模型分析不同層位狀態(tài)條件下底板應(yīng)力的大小及傳播規(guī)律。利用PFC模擬軟件對跨采巷道上方的應(yīng)力狀態(tài)進行監(jiān)測和分析并提出合理的支護方案。結(jié)合傾斜直角梯形的應(yīng)力演化規(guī)律和超前支承壓力的影響,分析推導(dǎo)工作面煤壁的載荷動態(tài)分布表達(dá)式,在底板應(yīng)力傳播的基礎(chǔ)上綜合分析巷道穩(wěn)定性,并利用數(shù)值模擬監(jiān)測分析應(yīng)力傳播規(guī)律并確定仲恒煤礦底板巷道12軌道運輸石門分區(qū)支護的界定,在及時支護和永久支護的基礎(chǔ)上提出主動支護和被動支護結(jié)合的雙耦合支護方式來應(yīng)對跨采的圍巖變形調(diào)動深部巖層自身的承載能力,來保證跨采的安全以提高生產(chǎn)率。
[Abstract]:In many mining areas of our country, there is a problem that the mining of close coal seam group affects the stability of floor roadway, especially the failure mechanism of surrounding rock of floor roadway affected by span mining is complex and the support is difficult, so it is very difficult to control the stability of near distance mining roadway. In fact, the influence of floor roadway by mining of close coal seam group is actually the failure problem of roadway under the action of dynamic and static pressure alternately in the mining process, which leads to the difficulty of roadway maintenance and then affects the safety of coal mine production. Based on the inclined long wall mining of 10304 mining face in Zhongheng Coal Mine, this paper studies the breaking mechanism and propagation law of key strata in large inclination right angle ladder stope by means of laboratory test, theoretical analysis and numerical simulation. The pressure distribution law and propagation principle of roadway surrounding rock under the influence of inclined coal seam mining are discussed, and the reasonable hierarchical support of roadway is realized. The main research contents and conclusions: based on the theory of elastic thin plate, the mechanical model of the key layer of right angle ladder thin plate in inclined state is established. The analytical solution and stress distribution expression of bending and subsidence of the key layer of straight angle ladder thin plate with fixed support and simply supported adjacent edge are obtained by using Kantorovich method, and the stress evolution law of the key layer of inclined right angle ladder is analyzed theoretically. The variation law of coal body stress value in working face is discussed. PFC numerical simulation is used to study the stress distribution of inclined right-angle ladder mining floor and the development of cracks across mining floor. The results show that the peak stress of the floor is concentrated near the middle of the mining face, and the crack of the floor is more developed in the high stress area, which combines the difference of the distance between the floor and the coal seam. A mechanical model is established to analyze the magnitude and propagation of floor stress under different horizon conditions. The stress state above the roadway is monitored and analyzed by PFC simulation software, and a reasonable support scheme is put forward. Combined with the stress evolution law of inclined right angle ladder and the influence of leading support pressure, the dynamic distribution expression of load on coal wall of working face is analyzed and deduced, and the stability of roadway is comprehensively analyzed on the basis of stress propagation of floor. The stress propagation law is monitored and analyzed by numerical simulation, and the definition of stone gate partition support for 12 track transportation of floor roadway in Zhongheng Coal Mine is determined. On the basis of timely support and permanent support, a double coupling support method combining active support and passive support is put forward to cope with the deformation of surrounding rock and mobilize the bearing capacity of deep rock strata, so as to ensure the safety of cross mining and improve productivity.
【學(xué)位授予單位】：山東科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD353

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 蔣邦友;王連國;顧士坦;張繼華;王榮超;;陽城礦深部復(fù)合型軟巖大巷破壞機制與支護設(shè)計[J];采礦與安全工程學(xué)報;2016年03期

2 劉偉韜;劉士亮;姬保靜;;基于正交試驗的底板破壞深度主控因素敏感性分析[J];煤炭學(xué)報;2015年09期

3 王宏宇;李博;李旭東;;淺談PFC軟件在巖土工程中的應(yīng)用[J];西部交通科技;2015年07期

4 王金安;張基偉;高小明;文建東;古亞丹;;大傾角厚煤層長壁綜放開采基本頂破斷模式及演化過程(Ⅰ)——初次破斷[J];煤炭學(xué)報;2015年06期

5 王炯;郭志飚;馬成榮;郝育喜;朱國龍;;深部回采巷道錨網(wǎng)索耦合支護技術(shù)研究[J];煤炭科學(xué)技術(shù);2015年05期

6 王其洲;謝文兵;荊升國;臧龍;張農(nóng);;動壓影響巷道U型鋼支架-錨索協(xié)同支護機理及其承載規(guī)律[J];煤炭學(xué)報;2015年02期

7 王新豐;高明中;;變長工作面采場頂板破斷機理的力學(xué)模型分析[J];中國礦業(yè)大學(xué)學(xué)報;2015年01期

8 陳蕾;洪寶寧;;黏性土無側(cè)限抗壓試驗顆粒流軟件(PFC)模擬的微觀分析[J];科學(xué)技術(shù)與工程;2014年16期

9 張向東;李慶文;黃開勇;李桂秀;張旭;;采動影響下大跨度煤巷耦合支護技術(shù)研究與應(yīng)用[J];巖石力學(xué)與工程學(xué)報;2014年01期

10 施龍青;徐東晶;邱梅;景行;孫紅華;;采場底板破壞深度計算公式的改進[J];煤炭學(xué)報;2013年S2期

相關(guān)重要報紙文章 前1條

1 ;中華人民共和國2016年國民經(jīng)濟和社會發(fā)展統(tǒng)計公報~(［1］)[N];人民日報;2017年

相關(guān)博士學(xué)位論文 前4條

1 劉國磊;鋼管混凝土支架性能與軟巖巷道承壓環(huán)強化支護理論研究[D];中國礦業(yè)大學(xué)（北京）;2013年

2 陳勇;沿空留巷圍巖結(jié)構(gòu)運動穩(wěn)定機理與控制研究[D];中國礦業(yè)大學(xué);2012年

3 張華磊;采場底板應(yīng)力傳播規(guī)律及其對底板巷道穩(wěn)定性影響研究[D];中國礦業(yè)大學(xué);2011年

4 張百勝;極近距離煤層開采圍巖控制理論及技術(shù)研究[D];太原理工大學(xué);2008年

相關(guān)碩士學(xué)位論文 前1條

1 申凱;邊角煤采場圍巖應(yīng)力分布規(guī)律與防沖設(shè)計研究[D];山東科技大學(xué);2011年

，

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