【摘要】 根据某矿1305工作面回采地质说明书及附图资料,结合该工作面的水文地质条件与煤层顶、底板岩层组合及结构性质特点,运用底板应变感应现场实测方法研究厚煤层开采过程中底板的变形破坏特征,再利用超声成像钻孔对其进行观测验证。结果表明采动过程中底板的应变感应显现出超前感应和滞后感应的特点,超前影响范围和滞后影响范围分别在110 m和44 m左右,综合对比分析得出该工作面底板变形破坏深度约为17~20 m。更多还原

【Abstract】 According 1305 face to the specification and drawings of mining geological data, combining with the hydrogeological conditions, mechanical properties of coal seam and structure and properties of roof and floor, using measurement method of strain sensing on floor to study the law of deformation and failure in process of thick seams mining, then, using ultrasonic image observation law to verify the research results. The results show that mining pressure on the floor reveal the "advance" and"backward"characteristics, at the same time, effects of advanced in the range of about 110 m, and effects of backward in the range of about 44 m, at last, reaching the deformation and failure depth is about 17~20 m of this working face.更多还原