关键词: 软岩巷道, 扩孔锚固, 切顶卸压, 高强支护

Abstract: The deformation control of the surrounding rock in the roadway of the deep high stress soft coal seam is of great significance to the safe and efficient production of the mine. Based on the engineering problems of the No. 3 coal seam roadway in Changping Coal Mine, such as the soft coal body, the weathering and fragmentation of the roof mudstone, and the severe deformation of the roadway retention caused by the large burial depth and strong dynamic pressure. The failure characteristics of the surrounding rock in the soft and broken roadway under the influence of dynamic pressure are analyzed. It reveals the failure and instability laws of different areas in the shallow and deep parts of the roadway, the three-in-one surrounding rock coupling control technology system of "roof cutting pressure relief + soft coal body reaming anchoring + roof high-strength support" was proposed, and an industrial test was carried out in the 53082 roadway. The results show that the technology and device for increasing the anchoring force of the hole bottom reaming can increase the anchorage performance of the roadway side coal by 84.6-114.3%, and effectively improve the support effect of the roadway side anchor cable; the coupling of roof cutting pressure relief and high-strength support is suitable for the safety of soft and broken roadway and the stability of surrounding rock. The research results can effectively control the strong deformation of the roadway under the influence of dynamic pressure, and significantly reduce the repair work of the roadway.