Seepage characteristics of collapse column fillings

摘要: Abstract With concealment and hysteresis, water-inrush from Karst collapse column has become an important security hazard of lower group coal mining in North China. Based on the MTS815.02 seepage test system, we analyzed impact consolidation pressure, initial moisture content confining pressure permeability fillings order to study characteristics fillings. The results show that: (1) is 10−16–10−15 magnitude decreases with increase decrease content. (2) essence filling law change porosity, a power function relationship exists between ratio porosity ratio. (3) increasing decreases. However, under low (1.2–4 MPa), no obvious influence permeability.