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| Stability Analysis of Large-scale Underground Caverns, Longtan Hydroelectric Project |
| Wei Jinbing, Min Hong, Deng Jianhui |
| (Key Laboratory of Rock and Soil Mechanics, Institute of Rock and Soil Mechanics, The Chinese Academy of Sciences, Wuhan 430071 China) |
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Abstract The surrounding rock masses of the underground caverns, Longtan hydroelectric project are constituted of highly dipped, interbedded sandstone and mud slate, with faults and bedding plane shears well developed. This paper models the deformation and failure characteristics of the surrounding rock masses and evaluates their stability during excavation of the caverns by finite element method (FEM) and discrete element method (DEM). Results show that the deformation and failure characteristics of the surrounding rock masses is mainly controlled by faults and bedding plane shears, with the upstream sidewall shearing along the planes, the downstream sidewall toppling, and that the roof subsides and the floor bulges a little, but both are quite stable. FEM and DEM give similar results.
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Received: 31 March 2003
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2003, Vol. 22 
