摘要Taking the carbonaceous slate of Zhuokeji tunnel on the Wenchuan-Ma,erkang expressway as the research subject, triaxial compression creep tests were conducted under various freeze-thaw cycles to analyze the creep strain characteristics and long-term strength of the carbonaceous slate. Assuming that the aging damage of rock under load follows the Weibull probability density distribution, the loaded damage variable is defined. The freeze-thaw damage variable is defined according to the phenomenological theory of damage mechanics. Considering the coupling effect of freeze-thaw and stress, a total damage variable for freeze-thaw and load is constructed. Based on the creep behavior of carbonaceous slate, the structure of the H-H｜N-N｜S creep model is determined. Based on this, the damage evolution is carried out, and a new creep damage model that can reflect the coupling of freeze-thaw and stress is obtained, which is extended to a three-dimensional stress state. The solution method for model parameters is provided, and the damage evolution law is analyzed. The creep characteristics of carbonaceous slate are identified using the established model. A traditional model is introduced for comparison, and the simulation comparison curve is analyzed to verify the feasibility and rationality of the new model.
Abstract：Taking the carbonaceous slate of Zhuokeji tunnel on the Wenchuan-Ma,erkang expressway as the research subject, triaxial compression creep tests were conducted under various freeze-thaw cycles to analyze the creep strain characteristics and long-term strength of the carbonaceous slate. Assuming that the aging damage of rock under load follows the Weibull probability density distribution, the loaded damage variable is defined. The freeze-thaw damage variable is defined according to the phenomenological theory of damage mechanics. Considering the coupling effect of freeze-thaw and stress, a total damage variable for freeze-thaw and load is constructed. Based on the creep behavior of carbonaceous slate, the structure of the H-H｜N-N｜S creep model is determined. Based on this, the damage evolution is carried out, and a new creep damage model that can reflect the coupling of freeze-thaw and stress is obtained, which is extended to a three-dimensional stress state. The solution method for model parameters is provided, and the damage evolution law is analyzed. The creep characteristics of carbonaceous slate are identified using the established model. A traditional model is introduced for comparison, and the simulation comparison curve is analyzed to verify the feasibility and rationality of the new model.
基金资助:This work was funded by Science and Technology Planning Project of Sichuan Province (Grant No.2018GZ0359)
通讯作者:
LIU Guo-min, HUANG Mei
引用本文:
LIU Guo-min, HUANG Mei, CAO Ming-ming, CHEN Hua. Experimental Study on Creep Characteristics and Damage Model of Carbonaceous Slate After Freeze-Thaw[J]. Journal of Highway and Transportation Research and Development, 2024, 18(2): 46-55.
LIU Guo-min, HUANG Mei, CAO Ming-ming, CHEN Hua. Experimental Study on Creep Characteristics and Damage Model of Carbonaceous Slate After Freeze-Thaw. Journal of Highway and Transportation Research and Development, 2024, 18(2): 46-55.
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2024, Vol. 18 
