近距离煤层多工作面开采沿空侧围岩结构演化规律研究

Research on the evolutional course of surrounding rock structure along gob side with excavation of multiple working faces in close distance seam

采用数值模拟的方法,针对南屯煤矿93下05工作面上覆及侧向采空复杂条件下多工作面相继采空的复杂地质条件,对多工作面开采下93下05工作面沿空侧围岩结构的动态演化过程进行了研究,得出基于南屯煤矿的近距离煤层多工作面开采后的沿空侧相应的围岩结构动态演化规律:93下07工作面回采后,93下07采空区下帮侧6 m范围内围岩以碎裂结构为主,沿空巷道附近其他位置以块裂结构为主;93上05工作面及93上03工作面回采后,3下煤顶板以碎裂结构为主,沿空巷道附近其他位置仍以块裂结构为主。

By adopting the method of numerical simulation, a research has been conducted to study the dynamic evolutional course of surrounding rock structure of 93 d 05 working face along gob side after excavation of multiple working faces, in response to the complex geological condition of 93 d corresponding 05 work-ing face with overlying and lateral excavation in Nantun coal mine. The dynamic evolu-tional course is obtained as follows：surrounding rock in the 93 d 07 working face along gob side within a range of 6 m is mainly cataclastic structure after excavation of 93 d 07 working face,and the rock in the other location around gob-side entry is mainly block structure;3 d coal roof is mainly cataclastic structure after excavation of 93 u 05 working face and 93 u 03 working face, and the other rock around gob-side entry is mainly block structure.