Stability of Remaining Room-type Coal Pillars in the Yuyang-Shenmu Fugu Mining Area
A large number of room-type coal pillars are left underground in the Yuyang-Shenmu-Fugu mining area,which may cause local mine tremors due to the relatively small size of the pillars.Based on the specific engineering practice of room-and-pillar mining at Shanghe Coal Mine,theoretical analysis,similar material simulation experi-ments,and FLAC3D computer numerical simulation were used to analyze the stability of the remaining room-type coal pillars.The results show that the theoretical calculation value of the overburden load borne by the remaining room-type coal pillars is much smaller than its uniaxial compressive strength,and there will be no crushing failure;similar material simulation experiments indicate that the remaining room-type coal pillars did not experience macro-scopic damage or collapse,and the subsidence of the overlying surface was minimal;computer numerical simulation concludes that although micro-shear failure occurred on both sides of the room-type coal pillars,there is a large ar-ea of elastic core in the middle,and there will be no overall plastic fracture;therefore,the current remaining room-type coal pillars at Shanghe Coal Mine maintain a stable state overall.If the pillar and room sizes are designed in reverse for mining,the coal pillars will experience significant plastic failure and deformation,leading to instability and triggering mine tremors.The research method has certain reference significance for exploring the stability of re-maining room-type coal pillars in similar production coal mines in Yulin.
room-type coal pillarsstabilitytheoretical analysissimilar material simulationFLAC3D
万方数据
维普
