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| Experimental study of stress relaxation characteristics of sandstone under stress and pore-water pressure coupling |
| CHEN Cancan1，2，3，4，PENG Shoujian2，XU Jiang2，TANG Yang5，SHANG Delei1，3，4 |
(1. Institute of Deep Earth Sciences and Green Energy，Shenzhen University，Shenzhen，Guangdong 518060，China；
2. State Key Laboratory of Coal Mine Disaster Dynamics and Control，Chongqing University，Chongqing 400044，China；
3. Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization，
Shenzhen University，Shenzhen，Guangdong 518060，China；4. College of Civil and Transportation Engineering，
Shenzhen University，Shenzhen，Guangdong 518060，China；5. School of Civil Engineering，
Chongqing University of Arts and Sciences，Chongqing 400044，China)
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Abstract Based on three-dimensional digital image correlation technology and adopting a transparent triaxial compression servo-control system，the stress relaxation characteristics of sandstone under the coupling action of pore-water pressure and stress are studied. The temporal and spatial evolution of the strain field in rock surfaces，the stress relaxation curve and micro-morphology of fracture surfaces are analyzed. The results show that：(1) The development and interpenetration of local micro-cracks in the radial strain field are the main controlling factor that causes the failure of brittle rock during stress relaxation. (2) When the relaxation stress level is at the stages of stable and unstable development of micro-cracks inside the rock，the increase of the pore-water pressure can significantly increase the stress relaxation variation and the radial strain change，and shorten the aging failure life of the rock. (3) Both the stress-time curve and the radial strain-time curve of the relaxation failure specimen show a “stepped” trend，and their rate-time curves present a “funnel-shaped”evolution trend，which essentially reflects the development，propagation and interconnection of micro-cracks during the process of stress relaxation. (4) The crack development on the fracture surface of the relaxation failure sample is dominated by intergranular cracks，which converge and connect with each other. The cemented matrix is seriously broken and the cemented structure is lost. The essence of stress relaxation failure of brittle rock is controlled by crack development and propagation.
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2022, Vol. 41 
