Volume 37 Issue 4
Aug.  2023
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Liu Jiansheng, Xiong Wenyong, Deng Xianghao, Fu Li, Tong Lihong. Experimental Study on the Stick-slip Phenomenon in Granular Materials and Its Physical Mechanism[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(4): 449-454. doi: 10.3969/j.issn.1007-2993.2023.04.013
Citation: Liu Jiansheng, Xiong Wenyong, Deng Xianghao, Fu Li, Tong Lihong. Experimental Study on the Stick-slip Phenomenon in Granular Materials and Its Physical Mechanism[J]. GEOTECHNICAL ENGINEERING TECHNIQUE, 2023, 37(4): 449-454. doi: 10.3969/j.issn.1007-2993.2023.04.013

Experimental Study on the Stick-slip Phenomenon in Granular Materials and Its Physical Mechanism

doi: 10.3969/j.issn.1007-2993.2023.04.013
  • Received Date: 2022-05-15
  • Accepted Date: 2022-12-09
  • Rev Recd Date: 2022-07-31
  • Publish Date: 2023-08-08
  • In order to explore the internal relationship between the macro mechanical response of granular materials in the shear process and their micro parameters, the stick-slip behavior of granular materials under compression and shear was studied through indoor direct shear test. Glass beads were used as granular materials to conduct direct shear test under different normal stresses, and the rate state friction model (RSF) was introduced to quantitatively analyze the test results, and the relevant parameters of the rate state friction model were obtained through the strength step test. The experimental results show that: (1) the variation trend of the stick-slip curve under different normal stresses is basically the same and shows a periodic pattern, but the stress drop and period caused by stick-slip decrease with the decrease of normal stress; (2) within the applied pressure range, the stiffness ratio κ is calculated to be less than 1, and κ decreases with the increase of normal stress. This indicates that the granular material meets the instability criterion, and the experimental phenomenon is consistent with theoretical predictions. This provides ideas for studying the mechanism of earthquake occurrence, and based on this, it can be inferred that the stick-slip instability of faults and the cause of earthquakes are caused by the instantaneous change of slip velocity at the fault plane. The smaller the κ value, the greater the peak stick-slip rate, and the greater the stress drop and stick-slip period generated.

     

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