Chinese Journal of Theoretical and Applied Mechani ›› 2012, Vol. ›› Issue (3): 638-642.DOI: 10.6052/0459-1879-2012-3-20120322

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Yang Wendong1,2, Zhang Qiangyong2, Chen Fang2, Li Shucai2, Li Wengang3, Wang Jianhong3, He Ruping3, Zeng Jiquan3   

  1. 1. College of Pipeline and Civil Engineering, China University of Petroleum, Qingdao 266580, China;
    2. Research Center of Geotechnical and Structural Engineering, Shandong University, Jinan 250061, China;
    3. Chengdu Hydroelectric Investigation & Design Institute, China Hydropower Engineering Consulting Group Corporation, Chengdu 610072, China
  • Received:2011-11-02 Revised:2012-02-10 Online:2012-05-23 Published:2012-05-24
  • Supported by:
    The project was supported by the National Basic Research Program of China (2009CB724607), the National Natural Science Foundation of China (41172268) and the Fundamental Research Funds for the Central Universities (11CX04051A)

Abstract: Long-term stability of the dam foundation is an important guarantee for the safety of dam operations, and the weak interlayer in the rock mass of dam foundation is an important factor which affects the stability and deformation. In order to study the deformation mechanism of the weak interlayer in diabase dikes under long-term load at Dagangshan hydropower dam foundation, in-situ large-scale compressive creep test using circular rigid bearing plate is carried out which is perpendicular to the weak interlayer in test cavern of dam slope. The five-parameter generalized Kelvin model is identified to describe the creep property of weak interlayer, which avoids the defects of three-parameter generalized Kelvin model that has the problem of unwanted rapid convergence. Based on the Boussinesq problem in elastic mechanics, the visco-elastic deformation formula of five-parameter generalized Kelvin model for rock mass under rigid bearing plate is derived for the first time through Laplace transform and inverse transform, and the rheological parameters are inversed.

Key words: rock mechanics|compressive creep test|parameter inversion|bearing plate test

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