层状盐岩温度应力耦合作用蠕变特性研究.pdf

27 1 Vol.27 No.1 2008 1 Chinese Journal of Rock Mechanics and Engineering Jan. 2008 ( 030024) (1) (2) (3) 1.61.8 (4) TU 45 A 1000 6915(2008)01 0090 07 STUDY ON COUPLED THERMO-MECHANICAL CREEP PROPERTIES OF BEDDED ROCK SALT XI Baoping ZHAO Yangsheng ZHAO Jinchang XU Suguo (Institute of Mining Technology Taiyuan University of TechnologyTaiyuanShanxi030024China) Abstract Through coupled creep experiment and theoretical analysis of thermo-mechanical behaviors of bedded rock salt the results are obtained as follows. (1) The creep ratios and creep strain of rock salt vary with ingredient and structural distribution. (2) Under normal temperaturethe creep strain and creep ratios of bedded rock salt increase when its loading stress increases and the steady creep ratios are with good power function of deviatoric stress. (3) Under thermo-mechanical coupling the steady creep ratios are affected by temperature when the loading stress is the same and the steady creep ratios of bedded rock salt are shown with exponential function of temperature. At the same temperature and stress the transversal displacement strain and creep ratios are larger than those of bedded salt-mudstone the creep ratio in landscape orientation of rock salt is 1.6 1.8 times larger than that of salt-mudstone interlayer. (4) As the ingredient and structure of each interlayer of bedded rock salt are differentthe creep strain is not consistent with the action of stress and temperatureand it will result in shearing failure. Finallythe cre