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《Chinese Journal of Underground Space and Engineering》 2014-06
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Research on Time Effect of Mechanical Parameters Deterioration for Surrounding Rock in Water-Rich Slate Tunnel

Zuo Qingjun;Wu Li;Bian Yisong;Luo Tao;Tan Yunzhi;Key Laboratory of Geological Hazards on Three Gorges Reservoir Area,Ministry of Education,China Three Gorges University;Faculty of Engineering,China University of Geosciences(Wuhan);  
Taking rock samples at DK384 + 080 of Yaojia Tunnel in Chang-Kun Hunan CKTJ-IX Section of Shanghai-Kunming Passenger Dedicated Line for example and considering the internal structure of slate and its characteristics of softening with water,the deterioration law of slate mechanical parameters under water-rock interaction is researched by water absorption and triaxial compression tests under different water absorption rates. The relationship between triaxial compression strength,elastic modulus,Poisson's ratio and water absorption rate is established. The relationship between the mechanical parameters and water absorption time considering time effect is constructed. The deterioration rate used to indicate the time dependence of water-rock interaction is proposed. The results indicate that with the increase of water absorption rate,the triaxial compression strength decreases in the form of linear function and elastic modulus decreases in the form of negative logarithm function. The regularity of Poisson's ratio is not clear. The relationship between Poisson's ratio and water absorption ratio can be fitted in the form of cubic function.There is close correlation between water absorption ratio,mechanical parameters and time. The relationship between water absorption ratio and time is a negative exponential function. The mechanical parameters show different degree of deterioration under water-rock interaction. In order to illustrate time effect of slate mechanical parameters deterioration in the corresponding time domain,the deterioration rate is obtained by differentiation of function for mechanical parameters with the change of water-rock interaction time.
【Fund】: 国家自然科学基金项目(41402259);; 湖北省自然科学基金重点项目(2013CFA110);; 三峡大学科学基金项目(KJ20130048)
【CateGory Index】: U451.2
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