In this paper, study was carried out on the evolution regularity of the mining fissures under different mining height by taking the geological and mining conditions of a coal mine as background and using the physical similar material simulation and theoretical analysis methods. The results showed that the development morphology and evolution regularity of the mining fissures under different mining height were similar, their evolution and distribution assumed two-stage characteristics of parabolic and saddle;with the increase of the mining height, the development height of fissures also increased, and it was in a secondary positive correlation to the mining height. The peak value of the stress concentration factor in the floor gradually decreased with the increase of the mining heights, and it was in a negative correlation to the logarithm of the mining height;the peak value of the stress concentration factor in the floor increased with increase of the distance to the coal wall, and it was in a positive correlation to the exponent of the mining height.%以某矿地质和开采条件为背景,采用物理相似材料模拟及理论分析综合方法,研究不同采高下采动裂隙演化规律,结果表明,不同采高下采动裂隙发育形态和演化规律相似,其演化及分布表现为"抛物线"状、"马鞍"状两阶段特征;随着采高的增加,裂隙发育高度也随之增大,其高度与采高呈二次正相关关系. 底板应力集中系数峰值随采高的增大而逐渐减小,其与采高的对数呈负相关关系;底板应力集中系数峰值距煤壁的距离随采高的加大而增大,其与采高的指数呈正相关关系.
展开▼
