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针对极近距离煤层群开采过程中出现的上下采空后进行中间煤层开采的具体工程条件,运用数值模拟、相似模拟和工程实践相结合的研究方法,分析了上下采空极近距离煤层开采过程中采场围岩应力分布规律、位移变化及变形破坏特征。研究表明:在煤层厚度不大、顶底板岩层基本稳定和采高3 m左右情况下,上下采空极近距离煤层开采中,煤层及顶底板整体应力有所降低,且其完整性没有受到严重破坏;而在工作面两巷外侧一定范围围岩应力集中程度明显加强,在工作面切眼和收作线煤壁附近35 m范围内,形成一定范围的剪切破裂区。在上下采空极近距离煤层开采中,应加强两巷修护与加固,合理布置工作面以避开应力集中区和剪切破裂区,并采取相应矿压控制措施,保证工作面正常安全开采。
Aiming at the specific engineering conditions of middle coal seam mining after the upper and lower emptying of the coal seam group during the mining process of the coal seam group with very close distance and by using the research methods of numerical simulation, similar simulation and engineering practice, the coal mining process Stress distribution, displacement and deformation and failure characteristics of surrounding rock in middle stope. The results show that under the condition of small thickness of coal seam, stable top and bottom rock strata and about 3 m of mining height, the overall stress of coal seam and roof and floor is reduced and the integrity is not serious And the stress concentration of surrounding rock in a certain range outside the two sides of working face obviously strengthened. Within a range of 35 m near the coal face near the face and the closing line, a range of shear fracture zone was formed. In the upper and lower mining floor short distance coal seam mining, should be strengthened two lane repair and reinforcement, reasonable layout of the work surface to avoid stress concentration zone and shear fracture zone, and take appropriate mine pressure control measures to ensure the normal safe mining face .