综采矸石充填沿空留巷顶板—巷旁支护协调稳定性研究

Coordinated Stability Study on Roof-roadside Support of Gob-side Entry Retaining in Fully-mechanized Gangue Backfilling Mining

本文针对深部高应力大采高工作面的沿空留巷难题,利用数值模拟的手段,分析了综采矸石充填沿空留巷围岩的受力变形特征,进一步研究了顶板和巷旁支护结构协调稳定性问题.结果表明:在充填区矸石的支撑作用下,顶板产生给定变形;通过在巷旁支护结构与顶板之间预留空间并用弱质材料充填的方法,可达到利用巷旁支护结构与顶板下沉的协调性来保证巷帮和顶板的稳定性的目的;避免了传统沿空留巷技术由切顶和支撑所造成的在巷旁支护结构上应力集中系数过大的问题,保证了深部大采高沿空留巷技术的成功.

Aiming at the high stress in deep mining workface gob, using the method of numerical simulation, the paper analyzes the coal gangue filling gob deformation characteristics and makes further study on the roof and roadway support structure coordination stability. The results show that the deformation of the roof is given under the support of the gangue in the filling area; that reserving space and weak material filling between the roof and roadway support structure can ensure the stability of roadway and roof using the coordination of roadway support structure and roof subsidence; that the study avoids the problem of excessive stress concentration factor caused by roof cutting and supporting and ensures the success of deep gob side entry retaining technology.