Rock and Soil Mechanics ›› 2023, Vol. 44 ›› Issue (11): 3082-3090.doi: 10.16285/j.rsm.2022.6831

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Analysis of shear characteristics of soil-rock mixture–geotextile interface under normal cyclic loading

LI Shui-jiang1, YAO Jia-min2, LIU Fei-yu2, LIU Hong-bo1, HOU Juan2   

  1. 1. Guangzhou Environmental Protection Investment Group Co., Ltd., Guangzhou, Guangdong 510330, China 2. School of Mechanics and Engineering Science, Shanghai University, Shanghai 200444, China
  • Online:2023-11-10 Published:2024-02-02
  • Contact: LIU Fei-yu, male, born in 1976, PhD, Professor, PhD supervisor, research interests: ground treatment and soil dynamics. E-mail: E-mail:
  • About author:LI Shui-jiang, male, born in 1970, Senior engineer, Master, mainly engaged in environmental protection engineering, project management, etc.
  • Supported by:
    the National Natural Science Foundation of China (52078285).

Abstract: The dynamic shear characteristics of the reinforcement–soil interface affect the stability and durability of reinforced soil–rock mixture subgrades. A series of static and dynamic direct shear tests was conducted on the soil–rock mixture–geotextile interface using a large dynamic direct shear apparatus under different rock contents (0%, 25%, 50%, 75% and 100%). The effects of normal stress amplitude (10, 20, 30, 40 and 60 kPa) and normal loading frequency (0.5, 1.0 and 2.0 Hz) on the shear response of the interface were analyzed. The test results indicate that the shear strength of the upper and lower boundaries of the interface first increases and then decreases with the increase in rock content. This is positively correlated with the normal stress amplitude, while negatively correlated with the normal loading frequency. An increase in rock content amplifies the interface dilatancy effect, while increases in stress amplitude and loading frequency reduce the interface dilatancy effect. The enhancement of the interface friction effect can be attributed to increased rock content and stress amplitude. An empirical formula for the interface friction coefficient, as a function of rock content, stress amplitude, and loading frequency, has been established. This formula coincides well with the test results.

Key words: soil–geosynthetic interface, soil-rock mixture, cyclic loading, rock content, stress amplitude, loading frequency