Creep behavior and permeability evolution of coal pillar dam for underground water reservoir

Abstract Using goof as water storage space plays a vital role in the ecological environment and economic development of arid mining areas, while rock strength stability coal pillars underground reservoirs are closely related to creep process. In this work, triaxial creep-seepage tests were conducted for samples develop new insights into behavior permeability evolution. The results showed that deformation evolution exhibit three stages, namely, compaction hardening stage before stress threshold, volumetric stage, dilatancy stage. decreases first then increases with strain it is well correlated variation strain.