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| Experimental study on salt rock creep damage rupture mechanism in high temperature triaxial conditions |
| LI Haoran1，2，XU Zhuang3，WEI Qun3，LIU Junfan1，2，ZHUO Cuiyao1，2 |
(1. Collaborative Innovation Center for Performance and Security of Large-scale Infrastructure，Shijiazhuang Tiedao University， Shijiazhuang，Hebei 050043，China；2. School of Safety Engineering and Emergency Management，Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China；3. School of Civil Engineering，
Shijiazhuang Tiedao University，Shijiazhuang，Hebei 050043，China) |
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Abstract In order to explore the creep behavior and damage evolution law of salt rock under the influence of temperature，the high temperature triaxial creep test machine and acoustic emission test system were used to study the creep deformation characteristics and acoustic emission activity of salt rock at 35 ℃，50 ℃，65 ℃，80 ℃，95 ℃ and 110 ℃. The moment tensor inversion theory is employed to analyze the focal mechanism and microscopic crack propagation mode. The results reveal that the steady-state creep rate of salt rock increases exponentially with the increase of the ambient temperature. The steady-state creep rate of salt rock at 110 ℃ is 35 times as much as that at 35 ℃. In the process of deceleration creep，the acoustic emission activity of salt rock is intense，the impact count rate fluctuates at a high level，and the b value rises steadily. In the process of steady creep，the acoustic emission activity of salt rock is intermittent，and the b value rises slowly and has no obvious fluctuation. The peak frequency of the acoustic emission signal is zonally distributed in a low frequency zone and a high frequency zone. The peak frequency，the proportion of high frequency signal，and b value of acoustic emission signal increase with the increase of the creep environment temperature. The initiation and dominance of small-scale micro-fracture events are enhanced by high temperature environment. The creep slip behavior of salt rock crystals can be effectively characterized by the slip angle of source rupture. The crystal slip of salt rock gradually develops from horizontal direction to vertical direction，while the fracture azimuth strike angle and dip angle are minimally affected by the increase of ambient temperature. The obtained results are of great significance to guide the safety design and long-life operation of ultra-deep salt cavern gas storage.
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2023, Vol. 42 
