發(fā)布時(shí)間：2019-05-28 03:39

【摘要】：我國(guó)很多礦區(qū)都存在近距離煤層群采動(dòng)影響底板巷道的穩(wěn)定問(wèn)題,尤其是受跨采影響的底板巷道圍巖破壞機(jī)理復(fù)雜,支護(hù)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(dòng)影響實(shí)際上是采動(dòng)過(guò)程中的動(dòng)靜壓交替作用下的巷道破壞問(wèn)題,從而造成巷道維護(hù)困難,進(jìn)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(zhǎng)壁開(kāi)采為工程背景,綜合運(yùn)用室內(nèi)試驗(yàn)、理論分析及數(shù)值模擬等手段,對(duì)大傾角直角梯形采場(chǎng)關(guān)鍵層破斷機(jī)理及傳播規(guī)律進(jìn)行研究,探究了傾斜煤層采動(dòng)影響的巷道圍巖壓力分布規(guī)律和傳播原理,實(shí)現(xiàn)巷道合理的分區(qū)段分層次支護(hù)。主要研究?jī)?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(jiǎn)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(duì)傾斜直角梯形關(guān)鍵層應(yīng)力演化規(guī)律進(jìn)行理論分析,探討了工作面煤體應(yīng)力值的變化規(guī)律;運(yùn)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(duì)跨采巷道上方的應(yīng)力狀態(tài)進(jìn)行監(jiān)測(cè)和分析并提出合理的支護(hù)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(dòng)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(cè)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(yùn)輸石門分區(qū)支護(hù)的界定,在及時(shí)支護(hù)和永久支護(hù)的基礎(chǔ)上提出主動(dòng)支護(hù)和被動(dòng)支護(hù)結(jié)合的雙耦合支護(hù)方式來(lái)應(yīng)對(duì)跨采的圍巖變形調(diào)動(dòng)深部巖層自身的承載能力,來(lái)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(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD353

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