含斷層煤層群的采動(dòng)作用規(guī)律研究
發(fā)布時(shí)間：2019-01-07 07:42
【摘要】：本文根據(jù)貴州某礦111013回采工作面地質(zhì)條件,應(yīng)用理論分析、相似模擬、數(shù)值模擬和礦壓實(shí)測的綜合方法進(jìn)行采動(dòng)作用下頂板斷層附近覆巖破斷、應(yīng)力和位移的演化規(guī)律研究。探索綜采面過斷層區(qū)時(shí)液壓支架工作阻力及煤壁片幫等礦山壓力顯現(xiàn)的機(jī)理,為類似條件工作面過斷層區(qū)時(shí)頂板穩(wěn)定性分析提供理論依據(jù)。結(jié)合摩爾-庫倫強(qiáng)度理論和斷裂力學(xué)理論,分析工作面過斷層區(qū)時(shí)斷層派生節(jié)理擴(kuò)展情況及斷層在采動(dòng)作用下的破壞規(guī)律。運(yùn)用相似模擬試驗(yàn)系統(tǒng),模擬含頂板斷層煤層的開挖,非斷層影響區(qū)內(nèi),工作面覆巖冒落帶和裂隙帶高度的模擬結(jié)果與經(jīng)驗(yàn)公式得出的結(jié)果基本吻合。工作面過頂板斷層前后,分析頂板斷層面上的正應(yīng)力、剪應(yīng)力及斷層面上下盤位移變化特征,得到工作面過斷層前后覆巖移動(dòng)規(guī)律及含斷層覆巖的冒落帶和裂隙帶發(fā)育高度。結(jié)果表明:當(dāng)采面位于頂板斷層正下方時(shí),斷層面上的正應(yīng)力和剪應(yīng)力均達(dá)到極值;冒落帶和裂隙帶發(fā)育高度受斷層影響明顯。運(yùn)用FLAC3D數(shù)值模擬軟件模擬工作面推進(jìn)過程中頂板斷層對工作面超前支承壓力分布、斷層面應(yīng)力狀態(tài)、覆巖應(yīng)力分布及覆巖塑性破斷特征的影響規(guī)律。結(jié)果表明:較斷層端部正應(yīng)力,剪應(yīng)力受采動(dòng)影響更加顯著,剪應(yīng)力急劇增加是導(dǎo)致斷層活化的主要原因;斷層頂端、底端受采動(dòng)影響存在顯著差異,斷層底端受采動(dòng)影響較頂端存在明顯的滯后性�，F(xiàn)場實(shí)測分析了貴州某礦111013綜采工作面液壓支架工作阻力和煤壁片幫情況,結(jié)果表明:根據(jù)頂板斷層和工作面位置關(guān)系將回采過程劃分為非斷層影響區(qū)和斷層影響區(qū),斷層影響區(qū)又分為高壓區(qū)和低壓區(qū),在高壓區(qū)范圍內(nèi)工作面煤壁片幫現(xiàn)象顯著且頂板垮落步距明顯小于非斷層影響區(qū)。
[Abstract]:Based on the geological conditions of 111013 mining face in a certain mine in Guizhou province, this paper studies the evolution law of overburden failure, stress and displacement in mining action by using the comprehensive methods of theoretical analysis, similarity simulation, numerical simulation and rock pressure measurement. This paper explores the working resistance of hydraulic support and the mechanism of mine pressure manifestation such as coal wall and slab when the fully mechanized face passes through the fault area, which provides a theoretical basis for the analysis of roof stability when the working face passes through the fault area under similar conditions. Combined with the Mohr-Coulomb strength theory and the fracture mechanics theory, the propagation of the fault derived joints and the failure law of the fault under the action of mining are analyzed. By using the similar simulation test system, the simulation results of the roof bearing fault coal seam excavation and the height of the overlying rock caving zone and the fracture zone in the non-fault affected area are basically consistent with the results obtained from the empirical formula. The characteristics of normal stress, shear stress and upper and lower face displacement before and after working face crossing roof fault are analyzed, and the law of overburden rock movement before and after working face crossing fault and the development height of caving zone and fracture zone with fault overburden are obtained. The results show that the normal stress and shear stress on the fault plane reach the maximum when the mining face is located directly below the roof fault, and the height of the caving zone and the fracture zone is obviously affected by the fault. FLAC3D numerical simulation software is used to simulate the influence of roof faults on the advance support pressure distribution, the stress state of fault plane, the stress distribution of overburden rock and the plastic fracture characteristics of overburden rock. The results show that the shear stress is more significantly affected by mining than the normal stress at the end of the fault, and the sharp increase of shear stress is the main cause of fault activation. There are significant differences between the top and bottom of the fault under the influence of mining, and the effect of mining on the bottom of the fault is more obvious than that on the top. The working resistance of hydraulic support and the coal wall cover of No. 111013 fully mechanized face in Guizhou coal mine are analyzed. The results show that the mining process is divided into non-fault affected area and fault affected area according to the relationship between roof fault and working face position. The fault affected area is divided into high pressure area and low pressure area. In the high pressure area, the phenomenon of coal wall cover is obvious and the falling distance of roof is obviously smaller than that of non-fault affected area.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD32
[Abstract]:Based on the geological conditions of 111013 mining face in a certain mine in Guizhou province, this paper studies the evolution law of overburden failure, stress and displacement in mining action by using the comprehensive methods of theoretical analysis, similarity simulation, numerical simulation and rock pressure measurement. This paper explores the working resistance of hydraulic support and the mechanism of mine pressure manifestation such as coal wall and slab when the fully mechanized face passes through the fault area, which provides a theoretical basis for the analysis of roof stability when the working face passes through the fault area under similar conditions. Combined with the Mohr-Coulomb strength theory and the fracture mechanics theory, the propagation of the fault derived joints and the failure law of the fault under the action of mining are analyzed. By using the similar simulation test system, the simulation results of the roof bearing fault coal seam excavation and the height of the overlying rock caving zone and the fracture zone in the non-fault affected area are basically consistent with the results obtained from the empirical formula. The characteristics of normal stress, shear stress and upper and lower face displacement before and after working face crossing roof fault are analyzed, and the law of overburden rock movement before and after working face crossing fault and the development height of caving zone and fracture zone with fault overburden are obtained. The results show that the normal stress and shear stress on the fault plane reach the maximum when the mining face is located directly below the roof fault, and the height of the caving zone and the fracture zone is obviously affected by the fault. FLAC3D numerical simulation software is used to simulate the influence of roof faults on the advance support pressure distribution, the stress state of fault plane, the stress distribution of overburden rock and the plastic fracture characteristics of overburden rock. The results show that the shear stress is more significantly affected by mining than the normal stress at the end of the fault, and the sharp increase of shear stress is the main cause of fault activation. There are significant differences between the top and bottom of the fault under the influence of mining, and the effect of mining on the bottom of the fault is more obvious than that on the top. The working resistance of hydraulic support and the coal wall cover of No. 111013 fully mechanized face in Guizhou coal mine are analyzed. The results show that the mining process is divided into non-fault affected area and fault affected area according to the relationship between roof fault and working face position. The fault affected area is divided into high pressure area and low pressure area. In the high pressure area, the phenomenon of coal wall cover is obvious and the falling distance of roof is obviously smaller than that of non-fault affected area.
【學(xué)位授予單位】：貴州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TD32
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1 李志華;竇林名;陸振裕;盧新偉;王國瑞;;采動(dòng)誘發(fā)斷層滑移失穩(wěn)的研究[J];采礦與安全工程學(xué)報(bào);2010年04期
2 王濤;王f袒，
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