STUDY ON DEFORMATION CHARACTERISTICS OF COAL SEAM IN COAL MINING SUBSIDENCE AREA IN PINGSUO, SHANXI PROVINCE, CHINA

摘要

Mine geological conditions are important geological factors affecting coal mine construction and production. Based on the geological structure of mines in Pingyu mining area, the geostress distribution characteristics of mines are determined. The deformation of coal seams in mine-800 horizontal coal mining subsidence area is determined by ADINA numerical simulation software. The characteristics of the geostress deformation simulation are carried out. The following results were achieved: the main coal seam 9 coal, 10 coal belongs to the stable coal seam, the roof is easy to fall ~ not easy to fall, the bottom plate exists drum phenomenon; there are 5 folds and 6 faults in the mine field, which constitute the study area. The overall structural pattern, due to the extensive development of limestone karst, resulted in the development of mine collapse columns; the maximum horizontal principal stress value of the study area-800m level is 41.40MPa, the range value is 16.2MPa-41.4MPa, and the minimum principal stress range is 9MPa-21.6. MPa, the maximum shear stress range is 1.8MPa-14MPa. It is found that with the gradual development of coal mining subsidence area, the distribution of stress is related to the lithology, structure and buried depth of the subsidence area. The results of in-situ stress analysis indicate that the horizontal principal stress of the Pingyu mining area is not changed by the size and direction of the tectonic action, but the intermediate principal stress and the horizontal minimum principal stress are affected by the location of the stress point due to the structure, depth and local residual stress.