含断层煤层群的采动作用规律研究
发布时间：2019-01-07 07:42
【摘要】：本文根据贵州某矿111013回采工作面地质条件,应用理论分析、相似模拟、数值模拟和矿压实测的综合方法进行采动作用下顶板断层附近覆岩破断、应力和位移的演化规律研究。探索综采面过断层区时液压支架工作阻力及煤壁片帮等矿山压力显现的机理,为类似条件工作面过断层区时顶板稳定性分析提供理论依据。结合摩尔-库伦强度理论和断裂力学理论,分析工作面过断层区时断层派生节理扩展情况及断层在采动作用下的破坏规律。运用相似模拟试验系统,模拟含顶板断层煤层的开挖,非断层影响区内,工作面覆岩冒落带和裂隙带高度的模拟结果与经验公式得出的结果基本吻合。工作面过顶板断层前后,分析顶板断层面上的正应力、剪应力及断层面上下盘位移变化特征,得到工作面过断层前后覆岩移动规律及含断层覆岩的冒落带和裂隙带发育高度。结果表明:当采面位于顶板断层正下方时,断层面上的正应力和剪应力均达到极值;冒落带和裂隙带发育高度受断层影响明显。运用FLAC3D数值模拟软件模拟工作面推进过程中顶板断层对工作面超前支承压力分布、断层面应力状态、覆岩应力分布及覆岩塑性破断特征的影响规律。结果表明:较断层端部正应力,剪应力受采动影响更加显著,剪应力急剧增加是导致断层活化的主要原因;断层顶端、底端受采动影响存在显著差异,断层底端受采动影响较顶端存在明显的滞后性。现场实测分析了贵州某矿111013综采工作面液压支架工作阻力和煤壁片帮情况,结果表明:根据顶板断层和工作面位置关系将回采过程划分为非断层影响区和断层影响区,断层影响区又分为高压区和低压区,在高压区范围内工作面煤壁片帮现象显著且顶板垮落步距明显小于非断层影响区。
[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.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：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.
【学位授予单位】：贵州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD32
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