In order to analyze the impact of uncertainty in measuring the surrounding rock conditions in the reservoir area on the sta-bility analysis of the surrounding rock,a three-dimensional numerical calculation model of caving was established using ANSYS/FLAC3D based on a domestic underground water-sealed cavern project,and numerical simulation of the cave stability was carried out.The displacement distribution,stress distribution and plastic zone distribution of surrounding rock were taken as the evaluation indi-cators of stability,and the influence of physical and mechanical parameters of surrounding rock(including elastic modulus,Poisson's ratio,density,internal friction angle,cohesion and tensile strength)and in-situ stress direction on the stability of sur-rounding rock of cavern was analyzed.By changing the size of the physical and mechanical parameters of the surrounding rock and the direction of the stress field,the study on the stability of the surrounding rock of underground water sealed caverns was carried out considering the uncertainty of the physical and mechanical parameters of the surrounding rock and the direction of the main stress.The numerical simulation results showed that when the physical and mechanical parameters of the surrounding rock decreased by 10％,the displacement of the surrounding rock increased significantly.When the direction of the in-situ stress changed by 10％,the displacement of the surrounding rock would increase.It showed that the change of physical and mechanical parameters of surrounding rock had a greater impact on the stability,and it verified that the strike of the main cavern should be parallel to the direction of crus-tal stress.
underground water-sealed storage cavernstabilityphysical and mechanical parameter of surrounding rockin-situ stress directionuncertainty
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