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结合上榆泉矿的工程地质条件,通过理论分析、数值模拟等方法研究了浅埋近距离采空区下综放工作面覆岩运动规律。理论分析表明:工作面覆岩关键层破断后形成“悬臂梁”结构;工作面背坡推进时,悬臂梁易于在支架后切落卸载,支护空间内整体矿压显现不明显;迎坡推进时,主关键层缺乏侧向水平力无法自稳,“铰接结构”易于活化失稳,切落悬臂梁易形成动载矿压灾害。
Combined with the engineering geological conditions of Yuquang Mine, the law of overlying strata movement in fully mechanized caving mining face under shallow buried short-distance goaf was studied through theoretical analysis and numerical simulation. The theoretical analysis shows that the key strata of the overburden strata form a “cantilever” structure when the working face is broken, and the cantilever beam is easily cut off and unloaded after the support is steeled on the work face. When the slope is advanced, the lack of lateral horizontal force of the main key layer can not be stabilized, and the “hinged structure” is easy to activate and destabilize, and the cantilever beam is easily cut off to form a dynamic mine pressure disaster.