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| Static and dynamic rupture characteristics and failure criterion of circular ring granite after thermal cycling |
| WANG Chun1，2，3，LI Xinru1，HU Mangu1，2，LI Jia1，ZHANG Hongcheng1，ZHANG Yifei1 |
(1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454003，China；2. Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization，Jiaozuo，Henan 454003，China；3. School of Resources and Safety Engineering，Central South University，Changsha，Hunan 410083，China)
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Abstract In order to reveal the deformation and rupture characteristics of wellbore surrounding rock in the energy storage area during deep geothermal energy mining，and to construct the failure criterion of circular ring granite，thestatic and dynamic mechanical tests of unidirectional compression in the ring plane were carried out. The test samples were treated by the methods of high temperature heating，heat transfer submerging andcyclic heating- soaking. In parallel，the rupture process of circular ring granite was investigated using high-speed photography and numerical simulation.The results show that the unidirectional static load-displacement curve of circular ring granite can be divided into three segments：up-concave-linear-like-post-peak failure，while the unidirectional dynamic load-displacement curve is similar to a parabola. When the heating temperature，immersion water temperatureand the number ofcyclic heating-soakingincrease，the static and dynamic peak load increases and the peak displacement decreases and both of them decrease occur in response to an increase in the inner bore diameter of the rock samples. The failure mode of the circular ring rock sample is tensile failure，and it is not affected by the type of unidirectional load. It is also found that the cracks all start occur from the inner ring wall of the rock sample in the direction of compression load.Finally，the evolution law of the accompanying energy of circular ring granite was revealed and on the basis of certain assumptions，the failure criterion of circular ring rock samples was established，and the rationality was verified by the test results.
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2023, Vol. 42 
