本文選題：巨厚巖層 + 注漿充填��； 參考：《中國礦業(yè)大學(xué)》2017年碩士論文

【摘要】：巨厚巖層作為一種特殊覆巖結(jié)構(gòu),在開采其下方煤層時常常導(dǎo)致動力現(xiàn)象發(fā)生,嚴(yán)重影響安全生產(chǎn)。巨厚巖層懸空不斷導(dǎo)致的煤體應(yīng)力集中,是此類災(zāi)害發(fā)生的重要原因。利用地面鉆孔對巨厚巖層下部的離層區(qū)進(jìn)行注漿充填,通過充填體將巖層載荷向下傳遞至采空區(qū),從而有效支撐巨厚巖層,是降低該巖體懸空引起應(yīng)力集中的有效手段。在該方法的實(shí)施中,注漿充填參數(shù)對覆巖載荷傳遞特性以及煤層采動應(yīng)力轉(zhuǎn)移的影響是影響工程效果的關(guān)鍵。因此,論文以數(shù)值模擬實(shí)驗(yàn)為主要研究手段,研究了巨厚火成巖下注漿充填載荷傳遞規(guī)律,并通過工程實(shí)踐進(jìn)行驗(yàn)證。研究揭示了注采比、注漿充填層位等關(guān)鍵充填參數(shù)對巨厚火成巖下采動應(yīng)力轉(zhuǎn)移的影響特征。由于充填體對覆巖載荷的下向傳遞作用,巨厚火成巖下離層注漿充填后將改變采動應(yīng)力分布特征,集中表現(xiàn)在采空區(qū)承載力得到增加、實(shí)體煤應(yīng)力集中得到減緩,其中,影響載荷傳遞性的工藝參數(shù)是注采比與充填層位。研究發(fā)現(xiàn),控制載荷傳遞性的關(guān)鍵因素是注采比(即充填量),與其相比,充填層位對載荷傳遞的影響要小很多。注采比越大,巨厚火成巖下采煤時采動應(yīng)力集中程度越小;隨著注采比的增加,采空區(qū)的應(yīng)力峰值明顯增加,煤體側(cè)應(yīng)力峰值、集中系數(shù)明顯降低,應(yīng)力影響范圍減小;在注采比為50%時,應(yīng)力集中增量降幅可達(dá)20%。在注采比相同條件下,注漿充填層位越高,煤體側(cè)應(yīng)力集中越小,注漿充填載荷傳遞效果越好。因此,巨厚火成巖下實(shí)施注漿充填時,在保證充填量的前提下,可優(yōu)先考慮選擇其底界面作為充填層位。研究得出了采空區(qū)支撐率與充填參數(shù)之間的關(guān)系。采空區(qū)支撐率隨注采比的增加而增加,隨著注漿充填層位的升高逐漸降低。在采寬150m條件下,注采比為32%~65%時,采空區(qū)支撐率為13%~39%;在相同注采比時,隨著采寬加大,支撐率還會明顯加大。注漿充填層位在煤層上方70m~170m時,采空區(qū)支撐率為46%~39%;在相同注漿充填層位時,支撐率隨采寬增加有降低趨勢。同時,研究得出,采空區(qū)支撐區(qū)范圍與煤體采動應(yīng)力特征參數(shù)均呈負(fù)相關(guān),即采空區(qū)支撐帶范圍不斷增大時,煤體側(cè)應(yīng)力集中系數(shù)、應(yīng)力集中增量、采動應(yīng)力影響范圍不斷減小。在海孜煤礦Ⅱ1026工作面實(shí)施巨厚火成巖下隔離注漿充填減災(zāi)試驗(yàn),有效降低了采動應(yīng)力集中造成的動力災(zāi)害,未出現(xiàn)因巨厚火成巖導(dǎo)致的采動災(zāi)害,安全采出原煤56.3萬噸,達(dá)到了安全回采的目的。
[Abstract]:As a special overlying rock structure, the huge thick rock stratum often leads to the occurrence of dynamic phenomenon and seriously affects the safety production when mining the coal seam below it. It is an important cause of this kind of disaster. It is the important cause of this kind of disaster. In the implementation of this method, the effect of grouting filling parameters on the load transfer characteristics of overburden and the effect of the coal seam mining stress transfer is the key to the effect of the shadow engineering. Therefore, the paper uses the numerical model in the implementation of the method. As the main research method, the law of loading transfer of grouting filling under huge thick igneous rock is studied and verified by engineering practice. The study reveals the influence of key filling parameters, such as injection production ratio, grouting filling layer and other key filling parameters on the mining stress and transfer under huge thick igneous rock. After the thick igneous rock grouting, the distribution of the stress distribution will be changed, the bearing capacity in the goaf is increased, the stress concentration of the solid coal is slowed down, and the process parameters affecting the load transfer are the injection production ratio and the filling layer. Compared with it, the effect of filling layer on load transfer is much smaller. The greater the injection production ratio, the smaller the concentration of the stress concentration in the coal mining under the huge thick igneous rock; with the increase of injection production ratio, the peak stress of the goaf is obviously increased, the peak stress of the coal body, the concentration coefficient decrease obviously, the stress influence range decreases, and the stress in the injection production ratio is 50%. Under the same injection and production ratio, the higher the injection and production ratio, the higher the grouting and filling layer, the smaller the stress concentration in the side of the coal body, the better the effect of the filling load transfer. Therefore, the bottom interface can be selected as the filling layer on the premise of ensuring the filling amount under the premise of filling the Thick Igneous Rock under the condition of grouting filling, and the goaf is studied. The relationship between the support rate and the filling parameters. The support rate of the goaf increases with the increase of injection production ratio, and gradually decreases with the increase of grouting filling level. Under the condition of 150m width, the supporting rate of the goaf is 13%~39%, when the injection production ratio is 32%~65%, the support rate will obviously increase with the same injection production ratio. When the position is above the coal seam, the support rate of the goaf is 46%~39%, while the support rate increases with the mining width at the same grouting layer. At the same time, it is concluded that the support area of the goaf is negatively correlated with the coal mining stress characteristic parameters, that is, the stress concentration coefficient of the coal body side should be increased when the range of the support zone is increasing in the goaf. The force concentration increment and the influence range of the mining stress are decreasing continuously. In the second 1026 working face of Haizi coal mine, the isolation grouting and filling reduction test under the thick igneous rock is carried out, which effectively reduces the dynamic disaster caused by the concentration of the mining stress concentration, and has not produced the mining disaster caused by the huge thick igneous rock, and the safe recovery is achieved by the safety recovery. Yes.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TD823.7

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