关键词: 深部开采, 孤岛开采, 超长工作面, 覆岩结构, 矿压规律

Abstract: After coal mining depth increase face lengthened, the strata control the increasingly prominent contradiction, production practice, the frequency, a wide range of support crushing is not only bring hidden trouble to safety production and cause serious economic losses, through theoretical analysis, analog simulation, field test and verify, on long island coal face of deep strata caving structure characteristics and the corresponding law of mine pressure appear is studied; It is considered that the fracture form of the main roof in goaf is closely related to the aspect ratio of working face, and the main roof usually forms a vertical "X" shape failure under the condition of overlong working face. By establishing a similar model, the relation between overburden caving form and subsidence curve and working face length is analyzed, and it is concluded that with the increase of working face length, the working face tendency is easy to form masonry beam structure, which makes it possible for the working face tendency to have two or more pressure peaks. Field observation shows that the main roof in the middle of the overlong working face is not broken off at one time, but broken off in different areas in the direction of inclination, showing an articulated state. Taking the 15106 super-long island working face of Sijiazhuang mine as an example, the overburden caving structure and the law of ore pressure show are analyzed, the field measurement is consistent with the theory and similar simulation analysis, which provides a theoretical basis for studying the overburden caving structure characteristics of the deep super-long working face.