Rock and Soil Mechanics ›› 2021, Vol. 42 ›› Issue (2): 511-518.doi: 10.16285/j.rsm.2020.0589

• Fundamental Theroy and Experimental Research • Previous Articles     Next Articles

Study on sandstone split mechanical properties under high temperature based on the DIC technology

SUN Wen-jin1, 2, JIN Ai-bing1, 2, WANG Shu-liang1, 2, ZHAO Yi-qing1, 2, WEI Li-chang1, 2, JIA Yu-chun1, 2   

  1. 1. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Key Laboratory of Ministry of Education for Efficient Mining and Safety of Metal Mine, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2020-05-12 Revised:2020-09-14 Online:2021-02-10 Published:2021-02-09
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (51674015, 51804018), the Fundamental Research Funds for the Central Universities (FRF-TP-19-026A1), the Student Research Training Program of USTB (20192793929) and the China Postdoctoral Science Foundation Project(2020M670138).

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Abstract: The aim of this study is to investigate the variation of sandstone mechanical properties under the condition of spilt after high temperature treatment. We heat-treat the sandstone sample at 400–1 000 ℃ and measure its physical properties. Based on that, we use digital image correlation (DIC) to record and analyze the evolution of strain field, crack generation, propagation and penetration process of sandstone that treated by different temperatures under Brazilian test. The results show that: With the increase of temperature, the mass of sandstone decreases, the volume increases, and the P-wave velocity decreases rapidly. When the temperature is lower than 800 ℃, the tensile strength of heated sandstone shows a downward trend, but the overall decrease is not significant, approximately 10%. The influence of high temperature on the tensile strength of sandstone is much greater than that of the compressive strength. When the temperature exceeds 800 ℃, the tensile strength decreases rapidly because of the increase of cracks inside the sandstone. Therefore, 800 ℃ can be regarded as the temperature threshold for the tensile deterioration of sandstone. As the heating temperature increases, the pores and fractures of sandstone keep developing, which reduces the difference of strains between the edge and the center of the Brazilian disk.

Key words: sandstone, high temperature, digital imagine correlation technology, Brazilian test

CLC Number: 

  • TU 452
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