潘一矿1602（3）工作面压架机理研究
发布时间：2019-04-22 18:21
【摘要】：安徽淮南矿区新生界第四系下含水是对现场实际生产过程有直接影响的含水层,以往留设了60-80m的防水煤(岩)柱,造成资源大量浪费。近年来,由于煤炭资源短缺,有些煤矿开始回采原来为留设防水煤柱而呆滞的煤层,但是部分矿井在邻近含水层采煤时发生了多起工作面压架突水事故,造成了重大经济损失。由于煤层上覆岩层赋存状态与深埋煤层开采情况相比有一定差异,导致邻近承压含水层煤层开采时,其覆岩垮落特征有很大的特殊性。针对潘一矿1602(3)工作面压架突水灾害问题,通过深入调查、收集、整理分析相关矿区工程地质特性,综合运用理论分析、数值模拟和实验室岩石力学测试试验、现场实测等手段,就潘-矿13-1煤层上覆覆岩结构特征、压架突水机理、支架合理工作阻力及灾害防治对策进行深入研究。 通过理论分析和模拟试验研究,揭示了松散层下部的承压含水层起到了均匀传递载荷的作用,此时基岩承受的载荷较无承压含水层情况下要大得多,松散层下部有无承压含水层对基岩面承受载荷的大小影响很大,无承压含水层时,自开挖刚开始进行时,基岩层位处的垂直应力呈现非均匀分布特征；有承压含水层时,基岩层位处的垂直应力基本不受开挖的影响,载荷基本保持不变。在对潘一矿13-1煤层覆岩结构分类的基础上,通过数值模拟,研究掌握了高承压含水层载荷传递作用下不同覆岩结构垮落特征：当坚硬型覆岩结构岩层的岩性组合及其厚度满足一定的条件时,硬岩层易发生复合破断；中硬型覆岩结构初次破断时会形成非对称三铰拱式结构。将上述结论应用到1602(3)工作面,其覆岩同时存在坚硬型和中硬型覆岩结构,且满足硬岩层发生复合破断的条件,运用关键层理论,建立了不同覆岩结构初次垮落后结构力学模型,计算出了防止结构出现滑落失稳时支架合理工作阻力均大于支架实际工作阻力,这是导致1602(3)工作面出现压架突水的根本原因。提出防治压架突水的对策并应用于工程实践,获得了良好的安全经济技术效益。
[Abstract]:The water cut under the Cenozoic Quaternary in Huainan mining area of Anhui province is an aquifer which has a direct influence on the actual production process in the field. In the past, 60 ~ 80 m waterproof coal (rock) columns were set up, resulting in a large amount of waste of resources. In recent years, due to the shortage of coal resources, some coal mines began to recover the coal seams which had been stagnant in order to retain waterproof coal pillars. However, in some mines, when mining coal near the aquifer, a number of accidents of water inrush occurred at the working face pressure frame, resulting in a great economic loss. Because of the difference between the occurrence state of the overlying strata of the coal seam and the mining situation of the deep coal seam, the characteristics of the overlying rock caving are very special in the mining of the coal seam near the confined aquifer. Aiming at the water inrush disaster of pressure frame in 1602 (3) working face of Panyi Coal Mine, through in-depth investigation, collection and analysis of relevant mining area engineering geological characteristics, comprehensive use of theoretical analysis, numerical simulation and laboratory rock mechanics test, In this paper, the overlying rock structure characteristics, water inrush mechanism, reasonable working resistance and disaster prevention countermeasures of the overlying rock in Pan-1 coal seam are studied by means of on-the-spot measurement and other means. Through theoretical analysis and simulation experiments, it is revealed that the confined aquifer in the lower part of loose bed plays a role of uniform load transfer, and the load of bedrock is much larger than that of non-confined aquifer. Whether or not there is a confined aquifer in the lower part of the loose bed has a great influence on the load bearing on the bedrock surface. When the aquifer is not confined, the vertical stress in the bedrock bed is non-uniform distribution when the excavation begins. In confined aquifer, the vertical stress at bedrock level is almost unaffected by excavation, and the load is basically unchanged. On the basis of classification of overburden rock structure of 13-1 coal seam in Pan-1 Coal Mine, numerical simulation is carried out. The collapse characteristics of different overburden rock structures under the load transfer of high confined aquifer are studied and grasped: when the lithologic combination and thickness of hard overlying rock strata meet certain conditions, the hard rock strata are prone to compound fracture; The asymmetrical three-hinged arch structure will be formed when the medium-hard overlying rock structure is broken at the first time. Applying the above conclusion to 1602 (3) working face, the overburden rock has both hard and medium-hard overburden structure, and satisfies the condition of complex fracture of hard rock stratum, and applies the theory of key stratum. The mechanical models of the first collapse and backwardness of different overburden structures are established, and the reasonable working resistance of the support is greater than the actual working resistance of the support when the structure is prevented from sliding and instability. This is the root cause of water inrush in 1602 (3) face. This paper puts forward the countermeasures of preventing and controlling the water inrush of the press frame and applies it to the engineering practice, and obtains good safety, economic and technical benefits.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD74
本文编号：2463081
[Abstract]:The water cut under the Cenozoic Quaternary in Huainan mining area of Anhui province is an aquifer which has a direct influence on the actual production process in the field. In the past, 60 ~ 80 m waterproof coal (rock) columns were set up, resulting in a large amount of waste of resources. In recent years, due to the shortage of coal resources, some coal mines began to recover the coal seams which had been stagnant in order to retain waterproof coal pillars. However, in some mines, when mining coal near the aquifer, a number of accidents of water inrush occurred at the working face pressure frame, resulting in a great economic loss. Because of the difference between the occurrence state of the overlying strata of the coal seam and the mining situation of the deep coal seam, the characteristics of the overlying rock caving are very special in the mining of the coal seam near the confined aquifer. Aiming at the water inrush disaster of pressure frame in 1602 (3) working face of Panyi Coal Mine, through in-depth investigation, collection and analysis of relevant mining area engineering geological characteristics, comprehensive use of theoretical analysis, numerical simulation and laboratory rock mechanics test, In this paper, the overlying rock structure characteristics, water inrush mechanism, reasonable working resistance and disaster prevention countermeasures of the overlying rock in Pan-1 coal seam are studied by means of on-the-spot measurement and other means. Through theoretical analysis and simulation experiments, it is revealed that the confined aquifer in the lower part of loose bed plays a role of uniform load transfer, and the load of bedrock is much larger than that of non-confined aquifer. Whether or not there is a confined aquifer in the lower part of the loose bed has a great influence on the load bearing on the bedrock surface. When the aquifer is not confined, the vertical stress in the bedrock bed is non-uniform distribution when the excavation begins. In confined aquifer, the vertical stress at bedrock level is almost unaffected by excavation, and the load is basically unchanged. On the basis of classification of overburden rock structure of 13-1 coal seam in Pan-1 Coal Mine, numerical simulation is carried out. The collapse characteristics of different overburden rock structures under the load transfer of high confined aquifer are studied and grasped: when the lithologic combination and thickness of hard overlying rock strata meet certain conditions, the hard rock strata are prone to compound fracture; The asymmetrical three-hinged arch structure will be formed when the medium-hard overlying rock structure is broken at the first time. Applying the above conclusion to 1602 (3) working face, the overburden rock has both hard and medium-hard overburden structure, and satisfies the condition of complex fracture of hard rock stratum, and applies the theory of key stratum. The mechanical models of the first collapse and backwardness of different overburden structures are established, and the reasonable working resistance of the support is greater than the actual working resistance of the support when the structure is prevented from sliding and instability. This is the root cause of water inrush in 1602 (3) face. This paper puts forward the countermeasures of preventing and controlling the water inrush of the press frame and applies it to the engineering practice, and obtains good safety, economic and technical benefits.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TD74
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