STUDY OF METHODOLOGY OF PLATE-LOADING CREEP TEST OF ROCK MASS
XIONG Shihu,ZHOU Huoming,ZHONG Zuowu
(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Yangtze River Scientific Research Institute,Wuhan,Hubei 430010,China)
Abstract:Laboratory results can hardly reflect the rheological properties of engineering rock mass because of the size-effect of samples and the difference between test conditions and work state of engineering rock mass;so in-situ creep tests were carried out in some important hydropower projects;and the in-situ plate-loading creep test is applied more often. But in the test method,there exist some shortages,so it is suggested that the generalized five-parameter Kelvin model can be accepted to describe the rheological properties of rock mass;and the single-stage loading manner with load level being consistent with engineering load is suggested. The creep deformation equation based on generalized five- parameter Kelvin model of rock mass under plate-load is deduced;and it is found that the results agree with elastic deformation equation when t = 0 or t→∞. Finally,test examples,of which creep model and its parameters are inversed using nonlinear least squares curve fitting method,are given to demonstrate that the magnitude of the correlation between generalized five-parameter Kelvin model and test curves is superior to that of generalized three-parameter Kelvin model.
熊诗湖,周火明,钟作武. 岩体载荷蠕变试验方法研究 [J]. 岩石力学与工程学报, 2009, 28(10): 2121-2127.
XIONG Shihu,ZHOU Huoming,ZHONG Zuowu. STUDY OF METHODOLOGY OF PLATE-LOADING CREEP TEST OF ROCK MASS. , 2009, 28(10): 2121-2127.