关退煤矿压缩空气储能内衬式岩硐荷载传递机制及稳定性研究OA

Utilizing the existing underground roadways and chambers of decommissioned coal mines for the construction of underground gas storage caverns in compressed air energy storage(CAES)power stations can effectively revitalize abandoned mining resources.However,under high internal pressure,soft-rock caverns are prone to tensile cracking instability and sealing failure.Therefore,it is necessary to investigate the load transfer mechanism and stability of lined gas storage caverns.Based on the engineering and hydrogeological conditions of a coal mine in Shandong Province,a three-dimensional numerical model was established in ABAQUS to analyze the mechanical responses of a combined support system consisting of a steel liner,reinforcement bars,lining,and rock bolts under different gas storage pressures,cross-sectional shapes,fault influences,and large-diameter shaft storage conditions.The results show that the steel liner-reinforcement-lining-rock bolt support system plays a vital role in maintaining the stable operation of high-pressure gas storage caverns.As the storage pressure increases from 6 to 10 MPa,the tensile stress in the circular lining rises from 19 MPa to 27 MPa,the tensile stress in the steel liner increases from 161 MPa to 235 MPa,and the tensile stress in the reinforcement bars increases from 132 MPa to 196 MPa.Both the horseshoe-shaped cross-section and fault effects cause greater tensile stresses in key supporting structures.In the large-diameter shaft scheme,tensile effects are more pronounced in the sections closer to the ground surface.The findings reveal the load transfer and stability characteristics of lined rock-cavern CAES systems in decommissioned coal mines,and can provide a reference for the design theory and safety control of soft-rock underground gas storage caverns,with engineering significance for the sustainable development and utilization of underground space resources in abandoned coal mines.