Experimental Study of the Mechanical and Acoustic Emission Characteristics of Sandstone by Using High-Temperature Water-Cooling Cycles

Wen Wang (), Lei Hong (), Xuewen Cao, Xiaowei Lu, Fan Wang, Tong Zhang and Weibing Zhu
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Wen Wang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Lei Hong: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Xuewen Cao: School of Resources and Civil Engineering, Northeastern University, Shenyang 110819, China
Xiaowei Lu: School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China
Fan Wang: School of Energy Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, China
Tong Zhang: State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines, School of Energy and Safety, Anhui University of Science and Technology, Huainan 232001, China
Weibing Zhu: School of Mining Engineering, China University of Mining and Technology, Xuzhou 221116, China

Sustainability, 2023, vol. 15, issue 18, 1-17

Abstract: In order to study the physical and mechanical properties of sandstone under high-temperature water-cooling cycling conditions, an RMT-150B electrohydraulic servo rock testing system and a DS-5 acoustic emission detection and analysis system were used to conduct uniaxial compression acoustic emission tests on sandstone after high-temperature water-cooling cycles. The deformation, strength, and acoustic emission characteristics of sandstone were analyzed under different temperatures and cycle times. The results show that the high-temperature water-cooling effect caused changes in the physical properties of sandstone. The volumetric expansion rate of the rock samples first decreased, then increased in temperature, and the strength first increased, then decreased, whereas the number of cycles had less of an impact on the physical properties. At 200 °C, with increased cycle number, the elastic modulus increased by 20.1%, and the compressive strength increased from 63.9 MPa to 71.46 MPa. At 300–600 °C, the elastic modulus and compressive strength of sandstone gradually decreased with increases in the temperature and cycle number, with reductions of 6.04%, 7.24%, 28.7%, 35.57%, 17.6%, 18.2%, 20.4%, and 60.5%, respectively. With increased temperature and cycle times, the acoustic emission ringing counts increased, ringing counts and cumulative energy appeared earlier, the rock samples entered elastic deformation earlier, the yield stage length increased, and the samples showed a tendency to transition from brittle to ductile damage.

Keywords: rock mechanics; high-temperature water-cooling cycle; uniaxial compression; acoustic emission characteristics (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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