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《Chinese Journal of Rock Mechanics and Engineering》 1989-02
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Dilatancy Creep and Relaxation of Brittle Rocks Measured with the 8000 KN Multipurpose Triaxial Apparatus

Tan Tjong Kie, Shi Zhe Ouan, Yu Zhi Hal, Wu Xiang Yang (InstitUte of Geophysics,Academia Sinica, Beijing,China)  
A comprehensive description is given of the new 8000 KN servocontrolled multipurpose triaxial apparatus for the research of the dilatancy, creep and relaxational behaviour of rocks in the brittle stage. Eight series of tests at the constant strain rate of 5×10~(-5)/sec on samples of Fangshan granite and jinan gabbro have been performed for various confining pressures and temperatures; the dilatancy parameters have been determined on the basis of constitutive equations for creep dilatancy presented earlier (Tan, Kang 1983). The tests show an increase of dilatancy with the temperature and suppression of dilatancy with the confining pressure. A creep test on Fangshan granite has been carried out under a stepwise loading under 200 MPa confining pressure and a temperature of 200℃; in this manner the dependence of creep on deviatoric stress and time can be obtained very easily from one sample. At last a relaxation test under the same confining pressure and temperature has been performed under stepwise straining with the time. The yield values f* for creep and relaxation have been determined from the stress-strain isochrones. An analysis of the time dependent processes of dilatancy is presented in connection with structural changes due to crack growth, coalescence and generation.
【Fund】: 国家自然科学基金
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