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| Study of tunnel safety and mechanism of hydromechanical coupling under conditions of high water pressure and non-Darcy flow (NSFC Program) |
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2009-09-05
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Wave velocity experiments, mechanical experiments, permeability and effective coefficients measuring tests and hydro-mechanical coupling experiments on marble speciments were firstly performed, based on which, two types of models were proposed respectively upon mesoscopic and macroscopic levels:(1)based on the mechanicsm of rock failure induced by microcracks propagation, a model was set up under micromechanical framework, a microscopic statistic model and a microcrack typed model were proposed to describe the permeability evolution at different stages of failure process,and a method of effective coefficient was introduced to predict its evolution; (2)an elastoplastic model was also presented for the sake of engineering application, the effective stress law and unified seepage flow law (including Darcy and non-Darcy flow) were accordingly introduced based on the mechanical model and a method of modelling hydromechanical coupling behavior was proposed. Furthermore, we presented yield approach index and failure degree to quantitatively evaluate failure dangerous property and evolution for rockmass under complicated stress, then, presented a set of evaluation system for rockmass dangerous property in the practical engineering. Finally, numerical method and program were proposed based on the above works, which was applied to safety evaluation of diversion tunnel of Jingping II Hydropower station, the results show that it is helpful and could gives some useful suggestions to the construction.
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Copyright
© 2005-2008, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences
Xiaohongshan, Wuchang, Wuhan 430071, P. R. China
E-mail: irsm@whrsm.ac.cn |
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