平煤十二矿矸石充填协同垮落式混合综采面矿压显现规律研究
发布时间：2018-12-27 13:33
【摘要】：本文以平煤十二矿的矸石充填协同垮落式混合综采工作面的开采技术为背景,在分析其系统布置、工作面关键设备选型配套、充填与采煤工艺的基础上,通过相似模拟与数值模拟手段研究了矸石充填协同垮落式混合综采工作面矿压显现规律,取得以下成果:(1)基于相似模拟实验,揭示了混采面垮落段、矸石充填段以及过渡段的裂隙发育与岩层移动规律,得出垮落段覆岩移动表现为“三带”规律,而矸石充填段覆岩以裂隙带和弯曲下沉带为主,垮落带发育相对较弱,且随矸石充填段长度与垮落段长度之比减小而裂隙带高度增加,顶板活动明显增加,矿压显现明显。(2)揭示了混采面推进长度和矸石充填段长度对混采面覆岩垂直应力影响规律,得出覆岩垂直应力主要集中在采空区边界及工作面过渡段处,且随着工作面的推进和矸石充填段的减小逐渐增加,同时垮落段覆岩垂直应力明显小于矸石充填段。(3)探讨了混采面推进长度和矸石充填段长度对顶板下沉形式以及过渡段长度的影响规律,得出混采面垮落段采空区覆岩移动明显大于矸石充填段,且顶板下沉总体呈现“瓢型”分布,同时其最大下沉处偏离混采面中心位置,且位置随着工作面推进保持不变,但下沉量随矸石充填段长度的增加而增加。对于混采面过渡段长度而言,其随着混采面推进及矸石充填段长度的减小而增加,并最终趋于稳定,具体变化范围为6.2m~13.5 m,若对应于1.5 m宽度的液压支架为4~9架。(4)依据平煤十二矿己15-31010矸石充填协同垮落式混合综采工作面工程实践,基于过渡段随混采面推进长度的变化规律,同时考虑过渡段瓦斯积聚、液压支架支护强度给出了过渡段液压支架个数,并分析了垮落段、矸石充填段和过渡段的液压支架支撑阻力大小及分布规律,确定了混采面以上三段的初次来压及周期来压步距,给出了矸石充填段和垮落段的煤体支承应力随混采面推进的变化规律,并印证了混采面矸石充填段与垮落段的覆岩垂直应力特征。
[Abstract]:Based on the mining technology of coal gangue filling combined with caving type fully mechanized mining face in No. 12 Coal Mine, this paper analyzes its system arrangement, key equipment selection and matching, filling and coal mining technology. By means of similarity simulation and numerical simulation, the regularity of rock pressure behavior of coal gangue filling combined caving combined fully mechanized mining face is studied. The following results are obtained: (1) based on the similarity simulation experiment, the caving section of mixed mining face is revealed. The law of fracture development and strata movement in gangue filling section and transition section shows that the overburden movement of caving section is characterized by "three zones", while the overburden rock of gangue filling section is dominated by fracture zone and bending subsidence zone, and the development of collapse zone is relatively weak. With the decrease of the ratio of the length of the gangue filling section to the length of the caving section, the height of the fracture zone increases, and the roof activity increases obviously. (2) the influence of the length of mixing face and the length of gangue filling section on the vertical stress of overburden is revealed. It is concluded that the vertical stress of overburden is mainly concentrated at the boundary of goaf and the transitional section of working face. And with the advance of working face and the decrease of gangue filling section, At the same time, the vertical stress of overburden in caving section is obviously smaller than that in gangue filling section. (3) the influence of the propulsive length of mixed mining face and the length of gangue filling section on the roof subsidence and the length of transition section are discussed. It is concluded that the overlying rock movement of goaf in caving section of mixed mining face is obviously larger than that of gangue filling section, and the roof subsidence is generally "ladle" distribution, and its maximum subsidence deviates from the central position of mixed mining face, and the position remains unchanged with the advance of working face. However, the amount of subsidence increases with the increase of the length of the gangue filling section. For the length of the transitional section of the mixed mining face, it increases with the mixing face advancing and the length of the gangue filling section decreases, and finally tends to be stable, and the specific range of variation is 6.2m~13.5 m. If there are 49 hydraulic supports corresponding to 1.5 m width. (4) according to the engineering practice of 15 ~ 31010 gangue filling and combined caving type fully mechanized mining face in No. 12 Coal Mine, based on the changing law of transition section with the advancing length of mixed mining face, At the same time, considering the gas accumulation in the transition section, the support strength of the hydraulic support gives the number of the hydraulic support in the transition section, and analyzes the size and distribution of the supporting resistance of the hydraulic support in the caving section, the gangue filling section and the transition section. The initial pressure and periodic pressure step of the three sections above the mixed mining face are determined, and the variation law of the supporting stress of coal body in the gangue filling section and the caving section with the advance of the mixed mining face is given. The vertical stress characteristics of overburden in gangue filling section and caving section of mixed mining face are confirmed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD32;TD823
[Abstract]:Based on the mining technology of coal gangue filling combined with caving type fully mechanized mining face in No. 12 Coal Mine, this paper analyzes its system arrangement, key equipment selection and matching, filling and coal mining technology. By means of similarity simulation and numerical simulation, the regularity of rock pressure behavior of coal gangue filling combined caving combined fully mechanized mining face is studied. The following results are obtained: (1) based on the similarity simulation experiment, the caving section of mixed mining face is revealed. The law of fracture development and strata movement in gangue filling section and transition section shows that the overburden movement of caving section is characterized by "three zones", while the overburden rock of gangue filling section is dominated by fracture zone and bending subsidence zone, and the development of collapse zone is relatively weak. With the decrease of the ratio of the length of the gangue filling section to the length of the caving section, the height of the fracture zone increases, and the roof activity increases obviously. (2) the influence of the length of mixing face and the length of gangue filling section on the vertical stress of overburden is revealed. It is concluded that the vertical stress of overburden is mainly concentrated at the boundary of goaf and the transitional section of working face. And with the advance of working face and the decrease of gangue filling section, At the same time, the vertical stress of overburden in caving section is obviously smaller than that in gangue filling section. (3) the influence of the propulsive length of mixed mining face and the length of gangue filling section on the roof subsidence and the length of transition section are discussed. It is concluded that the overlying rock movement of goaf in caving section of mixed mining face is obviously larger than that of gangue filling section, and the roof subsidence is generally "ladle" distribution, and its maximum subsidence deviates from the central position of mixed mining face, and the position remains unchanged with the advance of working face. However, the amount of subsidence increases with the increase of the length of the gangue filling section. For the length of the transitional section of the mixed mining face, it increases with the mixing face advancing and the length of the gangue filling section decreases, and finally tends to be stable, and the specific range of variation is 6.2m~13.5 m. If there are 49 hydraulic supports corresponding to 1.5 m width. (4) according to the engineering practice of 15 ~ 31010 gangue filling and combined caving type fully mechanized mining face in No. 12 Coal Mine, based on the changing law of transition section with the advancing length of mixed mining face, At the same time, considering the gas accumulation in the transition section, the support strength of the hydraulic support gives the number of the hydraulic support in the transition section, and analyzes the size and distribution of the supporting resistance of the hydraulic support in the caving section, the gangue filling section and the transition section. The initial pressure and periodic pressure step of the three sections above the mixed mining face are determined, and the variation law of the supporting stress of coal body in the gangue filling section and the caving section with the advance of the mixed mining face is given. The vertical stress characteristics of overburden in gangue filling section and caving section of mixed mining face are confirmed.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD32;TD823
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