(1. State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；3. School of Qilu Transportation，Shandong University，Jinan，Shandong 250002，China)
Abstract：The analysis of uplift failure mechanism for underground lined rock caverns is of significant importance for improving the storage capacity and safety of hydrogen. In this paper，the functions of the uplift failure lines in layered rock formations and the expressions of critical uplift pressure( ) are derived based on the Hoek-Brown strength criterion and the upper bound method of limit analysis. Subsequently，the analytical solutions are compared with numerical simulations. On this basis，the influence laws of shape and layout parameters of the caverns on the and uplift failure lines are investigated. The results show that the error range of between the theoretical and numerical solutions are within the range of 1.57%–2.20%，and the ranges of uplift failure are essentially the same. is directly proportional to the additional loads and cavern spacing，while inversely proportional to the cavern radius. Besides， exhibits the highest sensitivity to the additional loads，followed by the cavern radius，while the lowest sensitivity to the cavern spacing. The horizontal distances between the uplift failure lines at the layered interface are directly proportional to the thickness of the rock layers. Similarly，the gaps between the horizontal uplift failure ranges at the surface are also directly proportional to the thickness of the rock layers. In the selection of the storage sites of lined rock cavers，the cohesion and internal friction of soil can be considered as the safety reserve. Additionally，the influence of the cavern radius on and the capacity for hydrogen storage should also be comprehensively considered. Furthermore，sites with geological tectonic defects should be avoided based on the range of uplift failure lines. The research results hold significant guidance for the selection of hydrogen energy storage sites and the design of cavern shapes in layered rock formations within lined rock caverns.
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2024, Vol. 43 
