近距离亚关键层大采高综放开采覆岩失稳机制及矿压规律

Overburden Instability Mechanism and Strata Behavior Laws of Full-mechanized Caving Mining in Large Mining Height and Close Distance Inferior Key Layer

摘要: 为研究郭家河煤矿覆岩破断失稳机理及矿压显现规律，综合运用关键层理论、断裂力学、相似试验及现场实测等多种方法，对老顶与亚关键层的失稳条件、破断形式、工作面来压特性进行了分析。结果表明：在当前开采条件下，老顶发生切落失稳，亚关键层发生回转变形失稳，工作面呈现“大来压”与“小来压”特性，降低采放比可有效减小矿压显现程度。

Abstract: In order to study overburden instability mechanism and strata behavior law of Guojiahe Coal Mine, varieties of methods, such as key strata theory, fracture mechanics, similarity test and field measurement, are used to analyze the instability conditions, rupture forms, weighting characteristics of working face main roof and inferior key layer. Results showed that, in the current mining conditions, main roof occurrs shear-drop instability, and inferior key layer occurrs rotational distortion instability, working-face presents "big weighting" and "samall weighting" characteristics, the reduced mining and caving ratio can effectively decrease the degree of strata behaviors.