关键词: 孤岛工作面, 沿空掘巷, 柔模混凝土, 强力支护, 围岩控制

Abstract: In order to solve the problem of strong deformation of surrounding rock of fully gob driving roadway without coal pillar in shallow buried island working face, the overburden structure model of gob driving roadway is established, the overburden structure, ground pressure characteristics and roof structure fracture form of fully gob driving roadway are analyzed, and the influencing factors affecting the stability of surrounding rock of fully gob driving roadway are determined. Using theoretical analysis and numerical calculation methods, the compressibility of the support body, the width of the filling body beside the roadway and the support resistance of the filling body are determined, and the idea of coordinated control of surrounding rock such as strengthening the bearing performance of the anchorage system, strengthening the top wall structure and flexible support in the roadway is put forward. The results show that: firstly, the new "three high" bolt, large-diameter and high prestressed anchor cable and accessories are used to strengthen the support, so as to effectively control the deformation and failure of the shallow and deep parts of the roadway; At the same time, it is necessary to strengthen the coordinated control of roadway roof, and realize the effective support of the roof by strengthening the support strength and scope of roadway wall coal body; Finally, the advance temporary support in the roadway can resist the fracture and subsidence of key overburden and avoid the strong deformation of roadway roof. The three support modes should coordinate with each other in time and space, so as to realize the coordinated control of the three support modes on the roadway along the goaf. The research results have been verified in the field. The surrounding rock and wall structure of the roadway remain stable, the deformation is controllable, and the roadway support effect is good.