Space Size and Deformation Mechanism of Collapse Accumulation Body in Fault Fracture Zone

After the coal mine disaster, the collapse accumulation blocked the roadway and interrupted the rescue route, which seriously affected the development of the rescue work. Taking the rescue route of post-disaster collapse accumulation body in fault fracture zone as the background, based on clarifying the geological characteristics of fault fracture zone and the shape of accumulation body for the first time, the size formula of roadway caving area, the formula of accumulation body coverage, the calculation formula of accumulation body height is derived, and the deformation characteristics and debris movement mode of accumulation body are discussed. It is found that the fault fractured zone can be divided into three types: fragment type, crack type, and symbiotic type; The harder the rock fragment is, the more dispersed the particle size is; The number of contact points of tight accumulation body is more than that of loose accumulation body; The size of the caving area and the height of accumulation body are related to roadway height, width, lateral stress coefficient, and similar internal friction angle. The coverage of the accumulation body is related to the roadway height, the length of the fault fracture zone, the accumulation angle of the front area, and the accumulation angle of the back area. The field measurement results show that the calculation formulas of roadway goaf size, accumulation body coverage and accumulation body height accord with the field practice, and the coincidence degree is high; and the deformation of the accumulation body can be divided into load deformation and creep deformation. There are three ways of block adjustment: lateral movement adjustment, longitudinal movement adjustment, and self-rotation adjustment.