基于能量判据的盐岩库群整体稳定性分析方法

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Abstract In order to assess the global stability of underground cavern group for energy reserves，deformation stability theory which considers the strength reduction approach of finite element method is developed. The global stability criterion of cavern group is established based on the K-?E relation，where K is the strength reduction factor and ?E is the plastic complementary energy norm. The plastic complementary energy norm is the norm of unbalanced force，whose magnitude indicates the global stability of cavern group. The unbalanced forces clearly exhibit the position and pattern of the unstable failure. The global stabilities and unstable failure evolution laws of the single cavern，double cavern，multi-cavern and Jintan oil-gas storage cavern group in salt deposit are studied. Multiple influencing factors such as cavern diameter，cavern spacing，weak intercalation，internal pressure，pressure loss and cavern layout are considered. As a result，the maximum cavern diameter，the minimum cavern spacing，the minimum stable internal pressure and the optimal layout mode of cavern group are determined. The results show that the deformation stability theory provides practical and effective theory and method for the global stability assessment and unstable failure analysis of cavern group.

Key words： rock mechanics deformation stability theory salt rock cavern group global stability assessment unstable failure analysis plastic complementary energy unbalanced force

Received: 02 December 2010

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https://rockmech.whrsm.ac.cn/EN/Y2011/V30/I8/1513

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