采空區(qū)煤壁下礦壓分布規(guī)律及巷道穩(wěn)定性控制研究
[Abstract]:In the process of downgoing mining of coal seam in close distance, the distribution law of mine pressure in the lower coal seam is affected by the production work of the upper coal, among which, the layout of roadway and the control of stability have been one of the difficult problems puzzling the production of coal in the lower coal layer of the near distance coal seam. Therefore, according to the stress distribution in the middle and lower coal seam, it is of great significance to study the failure characteristics of surrounding rock and the stability support of roadway in different positions for the high yield and high efficiency production of the coal mine with the occurrence of the close distance coal seam. In this paper, the close coal seam of Liuyukou coal mine is taken as the research object, and the distribution of the stress field of the lower coal is analyzed based on the theoretical analysis, numerical simulation, engineering monitoring and so on, on the basis of the analysis of the distribution law of the lower coal stress field under the influence of the coal wall of the overlying goaf in the near distance coal seam. The failure characteristics and stability control of roadway at different positions in the lower coal are studied in depth. The results show that: (1) the stress field of the lower coal is mainly the change of vertical stress due to the influence of the supporting pressure in the goaf of the overlying coal seam. The theoretical calculation results show that the vertical stress reduction area is outside the influence area of the supporting pressure transfer of the overlying coal pillar under the lower coal goaf, and the vertical stress rising area is located in the coal wall of the goaf directly below the goaf from 4 m below the goaf to 25 m below the pillar. In the area of vertical stress rise, the vertical stress can be about 2 times that of the original rock stress. (2) the distribution of the lower coal stress is less affected by the mining height of the upper coal and the buried depth of the coal seam group, but by the upper coal roof lithology and the coal seam spacing. When the upper coal roof is strong, the vertical stress under the coal pillar increases obviously, and the vertical stress under the goaf decreases obviously. With the decrease of the distance between two coal layers, the peak value of stress in the lower coal increases dramatically. (3) due to the pressure release of goaf, the vertical stress in the surrounding rock of roadway under goaf is smaller. The distribution range of plastic zone is mainly concentrated in the rock strata of roof and floor, and the distribution area is smaller, and the deformation of roadway is also small, which is affected by the bearing pressure of coal pillar, The two sides and shoulders of the roadway located under the overlying coal pillar are affected by the sharp increase of vertical stress, the surrounding rock is shearing in a wide range, and the deformation of the roadway is large. (4) the lower coal roadway is easy to be supported under the goaf of the overlying coal seam. It is difficult to arrange the support under the overlying coal pillar. In engineering practice, it is better to arrange the roadway in the lower coal seam under the goaf of the overlying coal seam and to avoid placing the roadway under the overlying coal pillar as far as possible. In order to reduce the workload of roadway support, (5) the roadway under coal pillar should pay more attention to roof support and strengthen the control of surrounding rock between two sides and two shoulders of roadway, and the conventional support scheme can not meet the requirement of roadway stability. The optimized support scheme can change the section of roadway into a semi-circular arch section of straight wall, increase the diameter of anchor cable and increase the pretightening force of roadway, and inclined the anchor cable to the plastic yield area of two shoulders, which can improve the stress state of surrounding rock at the corner of both shoulders of roadway. In order to ensure the stability of roadway, the strength of surrounding rock in the area of shear failure is improved, the ability of roadway to resist pressure is enhanced, the function of supporting system and the self-supporting ability of surrounding rock are brought into play.
【學(xué)位授予單位】:太原理工大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2015
【分類號(hào)】:TD353
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