Limit equilibrium method for calculating the safe burial depth of underground caverns in compressed air energy storage

被引：0
|
作者：
Sun G. [1 ,2 ]
Wang Z. [1 ,2 ]
Wang J. [1 ,2 ]
Yi Q. [1 ,2 ]
Ma H. [1 ,2 ]
机构：
[1] State Key Laboratory of Geotechnical Mechanics and Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan
[2] University of Chinese Academy of Sciences, Beijing
来源：
Tumu Gongcheng Xuebao/China Civil Engineering Journal | 2023年 / 56卷
关键词：
compressed air energy storage( CAES); limit equilibrium; safe burial depth; underground caverns;
D O I：
10.15951/j.tmgexb.2023.S2.t04
中图分类号：
学科分类号：
摘要：
Underground lined rock caverns ( LRC ) with a flexible sealing have been widely used as gas storage for compressed air energy storage (CAES) power plants. Under high gas pressures, the safe burial depth, H, is crucial for the overall stability of the cavern and the overlying strata. This paper proposes a cone failure mechanism considering the friction and cohesion strength of the rock. An initiation angle a and a rock failure angle f3 are defined to determine the limit equilibrium state of the rock cone. Based on passive earth pressure theory, two governing equations concerning the burial depth H, safety factor Fs, and rock failure angle f3 are derived. The safe burial depth/safety factor are estimated by an initial value iteration algorithm developed by the authors. The proposed method was used to analyzing some engineering cases. Parametric study was also conducted to examine effects of in-situ stress coefficient k, rock density y, internal friction angle y, and cohesion ce. The results indicate that: Q) when k<. 0, the variation of A; will significantly affects H and j3; when 1. 0<k<2. 0, the effect of k declines; and for 2. 0<k<3. 0, k has no apparent effect. (2) The influence of cohesion ce on H and f3 is significant and complex. f3 increases with the increase of ce, while H initially increases and then decreases. © 2023 Editorial Office of China Civil Engineering Journal. All rights reserved.
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页码：65 / 77
页数：12
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