Stability Control of Roof Roadway in Ascending Mining of Inclined Strata

In view of the stability control problem in coal seam above goaf roadway, we study the roadway controlling technology in overlying strata with the method of numerical simulation, theoretical analysis. With the analysis, we propose that a low pressure semi-circle form above goaf. By the increasement of coal seam pitch, the vertical distance between semi-circle and underling coal seam shortens; the controlling technology of roadway above goaf should be composed of roadway layout, excavation time, and support technology; a combination controlling technology of high prestress anchor (cable) and U-shaped steel can ensure the stability of the area above the goaf of roadway. Industrial test in Xinzhuangzi Coal Mine validated above results.