Advertisement

Study on the Soil Water Characteristic Curve and Shear Strength Characteristics of Granite Soil with Different Weathered Degree

  • Youqian Lu
  • Changfu Wei
  • Guoqing Cai
  • Chenggang Zhao
Conference paper

Abstract

In this paper, the soils of the weathered granite with double layer soil slope in the hot and humid areas are studied. The water holding characteristics of compacted samples are studied by the pressure plate technique and vapor equilibrium method with saturated salt solution, and the effect of saturation on the shear strength is studied. The experimental results show that the residual soil has better water holding capacity than the completely weathered soil, which has greater air-entry value and residual suction value, and the gradient of the transition zone is smaller. There is an optimal saturation in this two weathered soils to reach the peak of the shear strength. The influence of shear strength index is different: the effect of saturation on the internal friction angle is little, but the effect on the cohesion is significant. The different weathered degree affects the soil properties such as the mineral composition and grain size gradation of two weathered soils. The residual soil has higher clay content and residual iron oxide, which affects two weathered soils in the soil water characteristic cure (SWCC) and shear strength of the characteristics. The mechanism of these differences can be clearly elucidated by analyzing the matrix suction and the cementation between soil particles, which provides a theoretical basis for the engineering management of weathered granite slopes.

Keywords

Weathered granite soils SWCC Saturation Shear strength Cementation effect 

Notes

Acknowledgement

Financial supports by the National Natural Science Foundation of China (41572293, 51722802, 51678041).

References

  1. Baker, R., Frydman, S.: Unsaturated soil mechanics: critical review of physical foundations. Eng. Geol. 106, 26–39 (2009)CrossRefGoogle Scholar
  2. Gallage, C.P.K., Uchimura, T.: Effects of dry density and grain size distribution on soil-water characteristic curves of sandy soils. Soils Found. 50(1), 161–172 (2010)CrossRefGoogle Scholar
  3. Gao, Y., Sun, D.A., Zhou, A.N.: Hydro-mechanical behavior of unsaturated soil with different specimen preparations. Can. Geotech. J. 53, 909–917 (2016)CrossRefGoogle Scholar
  4. Gvirtzman, H., Shalev, E., Dahan, O., Hatzor, Y.H.: Large-scale infiltration experiments into unsaturated stratified loess sediments: monitoring and modeling. J. Hydrol. 349, 214–229 (2008)CrossRefGoogle Scholar
  5. Konrad, J.-M., Lebeau, M.: Capillary-based effective stress formulation for predicting shear strength of unsaturated soils. Can. Geotech. J. 52, 2067–2076 (2015)CrossRefGoogle Scholar
  6. Wu, N.S.: Study on classification of granite residual soils. Rock Soil Mech. 27(12), 2299–2304 (2006). (in Chinese)Google Scholar
  7. Xu, L., Dai, F.C., Tham, L.G.: Field testing of irrigation effects on the stability of a cliff edge in loess, North-west China. Eng. Geol. 120, 10–17 (2011)CrossRefGoogle Scholar
  8. Zhang, Y.B., Zhang, Y., Chen, G., et al.: The system of engineering category dividing of granite residual soils. Bull. Chin. Acad. Geol. Sci. 18(2), 201–204 (1997)Google Scholar
  9. Zhou, A.N., Fredlund, D.G.: Shear strength criteria for unsaturated soils. Geotech. Geol. Eng. 29, 145–159 (2011)CrossRefGoogle Scholar
  10. Zhou, A.N., Huang, R.-Q., Sheng, D.: Capillary water retention curve and shear strength of unsaturated soils. Can. Geotech. J. 53, 974–987 (2016)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Youqian Lu
    • 1
  • Changfu Wei
    • 2
  • Guoqing Cai
    • 1
  • Chenggang Zhao
    • 1
  1. 1.School of Civil EngineeringBeijing Jiaotong UniversityBeijingChina
  2. 2.Institute of Rock and Soil Mechanics, Chinese Academy of SciencesWuhanChina

Personalised recommendations