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  2023, Vol. 42 Issue (S1): 3324-3330    DOI: 10.13722/j.cnki.jrme.2022.0644
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Determination method of long-term strength of Jinping marble under true triaxial stress#br#
ZHAO Jun,JIANG Mengfei,FAN Chen,WANG Jiarong
(Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines,Northeastern University,
Shenyang,Liaoning 110819,China)
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Abstract  Long-term strength is crucial for studying the time-dependent mechanical properties of deep engineering rock masses. Based on the anisotropic time-dependent fracture characteristics of hard rock induced by true triaxial stresses,the steady-state creep rate method for determining the long-term strength of Jinping marble was proposed in this paper,in which the stress when the steady-state creep rates in the directions of and    are equal is determined as the long-term strength of the rock. In addition,the long-term strength of Jinping marble was calculated by the isochronous curve method,the transition creep method,and the steady-state creep rate method,respectively. The results show that transition creep method is not suitable for solving the long-term strength of Jinping marble under true triaxial stress. It also shows that the isochronous curve method can only obtain the long-term strength range of Jinping marble under true triaxial stress and its accuracy relies on the stress increment selected by multistage creep loading. And the long-term strength of Jinping marble under true triaxial stresses can be accurately obtained by steady-state creep rate method,which proves the correctness and reliability of this method.
Key wordsrock mechanics      true triaxial stress      hard rock      steady creep rate      long-term strength     
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ZHAO Jun
JIANG Mengfei
FAN Chen
WANG Jiarong
Cite this article:   
ZHAO Jun,JIANG Mengfei,FAN Chen, et al. Determination method of long-term strength of Jinping marble under true triaxial stress#br#[J]. , 2023, 42(S1): 3324-3330.
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