Thermal and mechanical characteristics analysis of lined high pressure gas storage with different cavern spacing
RUAN Quanquan1,2, ZHANG Wen1, ZHANG Bin2*, WANG Qikuan2, WANG Hanxun2, SHI Guangsheng2
1. College of Civil and Hydraulic Engineering, Qinghai University, Xining 810016, Qinghai, China; 2. School of Engineering and Technology, China University of Geosciences(Beijing), Beijing 100083, China
Abstract The research background was the construction of large-scale lined cavern gas storage for a deep anhydrite ore body in Anhui province, the thermal-mechanical coupling analysis method based on ABAQUS finite element software was used, established numerical model under the gravity stress field, the deep cavity multi cycle under different cavern spacing was apart from the temperature, the gas extraction in the process of filling the key stratum structure deformation, stress distribution and the change process.The distribution law of surrounding rock plastic zone and the change process of surface deformation under different cavern spacing were investigated.The results showed that the temperature of the main structural layers was not affected by increasing the cavern spacing.When the cavern spacing was less than 2 times the hole diameter, changing the cavern spacing had obvious effects on the stress and deformation of key structural layers, surface displacement, tensile stress distribution and size of concrete lining, and plastic zone distribution of surrounding rock, and the interaction between gas storage was more significant.When the cavern spacing increased to 2 times the cavern diameter, the interaction between gas storage was no longer obvious, and the increase of cavern spacing had no obvious effect on the stability of gas storage.
RUAN Quanquan,ZHANG Wen,ZHANG Bin, et al. Thermal and mechanical characteristics analysis of lined high pressure gas storage with different cavern spacing[J]. Hazard Control in Tunnelling and Underground Engineering,
2024, 6(1): 73-83.
