Abstract:Pingyi Depression basin located in Shandong Province has rich gypsum resources. Since 1980s, the gypsum mining activities have been increasing continuously. Acoompanying with the continuous expansion of the mining area, mined-out areas have been increased, and the ground subsidence occurred. In December 25th in 2015, large area collapse happened in Yurong gypsum deposit and Wanzao gypsum deposit in Pingyi county. 29 miners were trapped. In the rescue process, a series of hydrogeological problems happened, such as water property of water-bearing formation in limestone has increased, supplying conditions of mine water has changed, karst water in limestone in upper part of gypsum layers give a large number of supply to mined-out areas, the threat of goaf water in south of the mine and karst collapse, etc directly affected rescue work. In this paper, hydrogeological problems during the rescue have been analyzed and studied, prevention and control measures have been summarized. It will provide some experiences and references for similar mine accident rescue.
