Journal of Yangtze River Scientific Research Institute ›› 2023, Vol. 40 ›› Issue (2): 81-86.DOI: 10.11988/ckyyb.20210929

• ROCK SOIL ENGINEERING • Previous Articles     Next Articles

Acoustic Emission Evolution Characteristics of Jointed Sandstone at Drying-Wetting Damage under Uniaxial Compression

WANG Gui-lin1,2, YANG Zheng-qin1, ZHANG Liang3, SUN Fan1   

  1. 1. College of Civil Engineering,Chongqing University,Chongqing 400045,China;
    2. National Centre for Local Joint Engineering Research on Environmental Geological Hazards in Reservoir Areas, Chongqing 400045,China;
    3. School of Architecture and Civil Engineering,Xi’an University of Science and Technology,Xi’an 710054,China
  • Received:2021-09-01 Revised:2021-10-28 Online:2023-02-01 Published:2023-03-07

Abstract: Dry-wet cycles cause irreversible cumulative damage to rocks,and the deformation and failure process of rock is accompanied by obvious acoustic characteristics.In order to explore the deformation and failure mechanism of jointed sandstone after dry-wet cycles,we monitored the acoustic data of damage and failure of jointed sandstone specimens under indoor uniaxial compression test by acoustic emission (AE),and further examined the evolution characteristics of acoustic emission parameters of intact single-jointed and double-jointed sandstone specimens in the deformation and failure process after different dry-wet cycles (0,1,5,10,15 and 20 cycles).Results elucidated that with the proceeding of dry-wet cycles,the post-peak plastic characteristics of sandstone rock specimens gradually increased,and the AE activities undergone weak,enhanced,steep increase,and intense stages;the duration of violent phase of acoustic emission,the decrease of cumulative ringing count,and the b value of AE in the process of deformation and failure gradually increased.The b values of AE of intact rock samples at any dry-wet cycle were larger than those of jointed rock specimens.The research findings offer reference for researching the deformation and failure mechanism of jointed rockmass under dry-wet cycles.

Key words: jointed sandstone, dry-wet cycles, uniaxial compression, acoustic emission monitoring, b value of acoustic emission

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