Study on Spatial Variation of Shear Mechanical Properties of Soil-rock Mixture

  • Yanhai Wang Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei Province, 443002, China; College of Civil Engineering and Architecture, China Three Gorges University, Yichang, Hubei Province, 443002, China
  • Jianlin Li Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang, Hubei Province, 443002, China; College of Civil Engineering and Architecture, China Three Gorges University, Yichang, Hubei Province, 443002, China
  • Qiao Jiang College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei Province, 443002, China
  • Yisheng Huang College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei Province, 443002, China
  • Xinzhe Li College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei Province, 443002, China

Abstract

The soil-rock mixture (SRM) is a kind of special engineering geological material, which has been exposed to the field for a long time and is affected by rainwater seepage, geological force, slope sliding force and human activities, resulting in the spatial variability of its mechanical properties. Taking the SRM distributed on a slope of the Three Gorges Reservoir area as the research object, four test locations were selected along and transverse the slope. First, in-situ large-scale direct shear test was carried out, and then the laboratory large-scale direct shear test, particle sieving test, and water content test were carried out in the undisturbed sample to study the variation of shear mechanical properties of SRM distributed in different spatial locations. The results show that: (1) Under the same normal stress, the peak strength of the SRM decreases at a similar rate along the slope direction and the transverse slope direction. (2) The cohesion of the SRM is continuously strengthened, and the friction angle is continuously deteriorated along the slope from high to low, the cohesion and friction angle are almost no variability along the transverse slope. (3) The mechanism of the above-mentioned variation in the shear mechanics parameters of SRM is that the lower the elevation along the slope, the more fragmented the rock, the lower the rock content. (4) Spatial variability models of cohesion and friction angle of SRM were established, which can provide references for related engineering applications.

Keywords: soil-rock mixture, large-scale direct shear test, shear mechanical parameters, spatial variation, rock content
Published online
2019-10-30
How to Cite
Wang, Y., Li, J., Jiang, Q., Huang, Y., & Li, X. Study on Spatial Variation of Shear Mechanical Properties of Soil-rock Mixture. Periodica Polytechnica Civil Engineering. https://doi.org/10.3311/PPci.14769
Section
Research Article