杜儿坪矿沿空掘巷上覆岩层大结构稳定性分析

摘要

Gob-Side entry driving overlying strata of 72908 working face in Du'erping coal mine is as the re-search object,on the basis of the influence of working face upper section mining,adopts the method of theoretical a-nalysis,sets up the structural mechanics model,analyzes and researches on the large-scale structure stability of gob-side entry driving overlying strata,obtains that the overlying strata large-scale structure is relatively stable at the stabilization stage of 72908 working face that return airway tunnelling and completed tunnelling.In the process of min-ing,overlying strata moves sharply,but the large -scale structure can not unstably collapse,so it is necessary to strengthen the roadway support,to ensure the stability of roadway and the normal use of gob-side entry driving dur-ing the period of production.%以杜儿坪矿72908工作面沿空掘巷上覆岩层为研究对象，在受上区段工作面回采影响的基础上，采用理论分析方法，建立大结构力学模型，对沿空掘巷上覆岩层大结构稳定性进行分析研究，得出在72908工作面回风巷掘进及掘后稳定阶段，上覆岩层大结构相对稳定；在回采过程中，上覆岩层活动剧烈，但上覆岩层大结构不会发生失稳垮落，需加强巷道支护以确保巷道的稳定性，保证沿空掘巷在生产期间的正常使用。