Three-dimensional stability analysis of the dam foundation at Baise |
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Authors: | Xu Qianjun Li Xu and Chen Zuyu |
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Affiliation: | (1) State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing, 100084, China;(2) China Institute of Water Resources and Hydropower Research, Beijing, 100044, China |
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Abstract: | It is usually difficult to determine the actual safety factors of rock masses in an ordinary two-dimensional stability analysis
if the safety factors of the different cross sections in the rock mass vary significantly. In addition to the actual slope,
arch dam abutment, and the actual foundation of a high building, another example is that the different cross sections of the
foundation in the monolith of a gravity dam vary significantly, just like the condition at the overflow dam in the Baise project.
A three-dimensional stability analysis method based on the upper-bound theorem was employed to solve this problem. The parameters
used in the analysis were obtained from geomechanics tests, as well as continuity simulations of the randomly distributed
joints. Two failure patterns against sliding are analyzed. One pattern is the foundation slide along deep-seated planes which
were determined by calculations. The other pattern is the foundation slide along the planes across the bottom of the high
steps in the foundation pit. The results indicate that a special overflow dam monolith can be considered to be safe in case
of considering the three dimensional effect. However, a key wall with a depth of 5m must be constructed at the upper side
of this monolith in order to ensure the safety of the foundation.
Translated from Chinese Journal of Rock Mechanics and Engineering, 2006, 25(3): 533–538 译自: 岩土力学与工程学报] |
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Keywords: | hydraulic engineering foundation stability against deep sliding three-dimensional analysis upper-bound theorem |
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