长壁开采条件下的巷道三岔口稳定性研究

Stability Research on Roadway Junctions under Longwall Mining

采用理论分析和数值模拟方法,研究长壁开采条件下顺槽和开切眼相交的三岔口处煤柱、顶板、底板的应力和位移分布特征。研究结果表明:煤柱在三岔口拐角处形成较大的三角形卸压区,此处煤壁片帮严重;交叉口顶板下沉剧烈区和底鼓区集中在三岔口中心处。根据位移和应力分布特征确定出三岔口周围的危险区域半径大约是巷道的宽度,并建议此处加大锚杆支护的深度和密度。这一研究成果可给同类条件下的矿井建设提供参考。

By theoretical analysis and numerical simulation, stress and displacement distribution char- acteristics of pillars, roofs and floors are studied in the junction of crosshead and open-off cut under the longwell mining. The result shows： the pillars at the corner of the junctions form triangular stress-released areas with serious rib falling; the subsidence and floor heave concentrate on the center of the junctions. Based on the displacement and stress distribution, the hazard areas＇ radius is approximately determined to be the width of roadway. The author suggests widening the depth and density of bolting support, which has reference value for the similar mining constructions.