切顶留巷巷道围岩变形及压力规律研究

Study on Deformation and Pressure Law of Surrounding Rock in Roof Cutting Retaining Roadway

依据某煤矿29#层左五采煤工作面切顶留巷巷道顶底板位移、围岩压力实时监测数据,分析研究了留巷巷道顶底板变形及围岩压力变化的时空演化规律。结果表明:工作面推进期间,留巷在滞后工作面20~120 m,围岩变形较为严重;滞后工作面120~200 m,围岩变形速度开始放缓,趋向稳定状态;滞后工作面200 m之后,围岩基本达到稳定状态。在空间分布上可将0~120 m留巷划为压力稳定区,120~240 m划为压力降低区,240~360 m划为压力升高区。研究结果可为相似条件工作面留巷巷道的稳定控制和支护设计提供依据。

Analyzes and studies the spatiotemporal evolution laws of the deformation of the top and bottom of the roadway and the change in surrounding rock pressure based on real-time monitoring data of the top and bottom of the cut top in the No.29 coal seam left fifth coal mining face of a certain coal mine.The results show that during the advancement of the working face,the residual roadway lags behind the working face by 20 m to 120 m,and the surrounding rock deformation is relatively severe;in the 120 m to 200 m section of the lagging working face,the deformation speed of the surrounding rock begins to slow down and tends towards a stable state;after a delay of 200 m from the working face,the surrounding rock has basically reached a stable state.In terms of spatial distribution,the O to 120 m section of the reserved roadway can be classified as a pressure stable zone,the 120 m to 240 m section as a pressure reducing zone,and the 240 m to 360 m section as a pressure increasing zone.The research results can provide a basis for the stability control and support design of similar conditions in the reserved roadway of the working face.