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| Experimental study on mechanical characteristics of radial compression of circular granite under the condition of temperature-humidity cycling |
| WANG Chun1，2，3，WANG Huaibin1，XIONG Zuqiang1，3，WANG Cheng1，CHENG Luping1，ZHAN Shuaifei1 |
| (1. School of Energy Science and Engineering，Henan Polytechnic University，Jiaozuo，Henan 454003，China；2. State and Local Joint Engineering Laboratory for Gas Drainage and Ground Control of Deep Mines，Henan Polytechnic University，Jiaozuo，Henan 454003，China；3. Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization，Jiaozuo，
Henan 454003，China) |
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Abstract For simulating the environmental changes experienced by wellbore surrounding rocks during the exploitation of geothermal energy，circular granite was heated and cooled and immersed in water at different temperatures for curing，thus the experimental study on the radial compression of circular granite under the condition of temperature-humidity cycling has been carried out. The results show that the deformation characteristics of circular granite are affected by inner diameter，heating temperature，curing water temperature and cycles of thermal energy exploitation，and there appear concave section，straight section，platform section and cliff descending section on load-displacement curve. The larger inner diameter，the higher temperature heating，the higher curing water temperature and more cycles of thermal energy exploitation weaken the ability of circular granite to bear radial load. In addition，the circular granite was destroyed under the effect of tensile stress，and it cracked along the circular inner wall of loading direction firstly，and then the cracks extended to the circular outer wall，resulting in buckling failure of the whole structure. Based on the deformation and failure characteristics of circular granite，it is indicated that the maximum tensile strain can be used as a parameter to determine whether the specimen is damaged. Furthermore，the failure criterion of circular granite is established with certain assumptions，and it is verified by the inner and outer wall strains of circular granite with different inner diameters under radial load.
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2020, Vol. 39 
