Abstract
The amount and scale of engineering construction in Xinjiang develop greatly in recent years. A channel slope in north Xinjiang is an infilled project, which is compacted using local loess material. Being different from the structural feature of natural loess, the infilled material needs to be sufficiently compacted. Study on the stress state, deforming feature and failing pattern of the material is important to reveal the slope stability issues. In this study, saturated and unsaturated triaxial shear tests were performed to study the stress-strain relationship and the mobilized shear strength, and to further investigate the dilatancy of the material. Saturated loess and unsaturated loess at three different suction levels were analyzed respectively. The research results are as below: Firstly, the mobilized shear strengths at peak state and at residual state increase with confining stress and suction level. Secondly, the soil dilatancy is affected by matric suction and stress level. The mobilized angle of dilation at peak state increases significantly with matric suction, but decrease with confining stress.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Alonso, E.E., Gens, A., Josa, A.: A constitutive model for partially saturated soils. Geotechnique 40(3), 405–430 (1990)
Bruchon, J.-F., Pereira, J.-M., Vandamme, M., et al.: Full 3D investigation and characterisation of capillary collapse of a loose unsaturated sand using X-ray CT. Granul. Matter 15(6), 783–800 (2013)
Donald, I.: Shear strength measurements in unsaturated non-cohesive soils with negative pore pressures. In: Proceedings of the 2nd Australia–New Zealand Conference on Soil Mechanics and Foundation Engineering. Technical Publications Ltd., Wellington (1956)
Dai, B.B., Yang, J., Zhou, C.Y.: A preliminary investigation on effect of particle size on mechanical behavior of granular materials. Rock Soil Mech. 35(7), 1878–1884 (2014)
Ng, C.W.W., Chiu, C.F.: Laboratory study of loose saturated and unsaturated decomposed granitic soil. J. Geotech. Geoenviron. Eng. 129(6), 550–559 (2003)
Wheeler, S.J., Sivakumar, V.: An elasto-plastic critical state framework for unsaturated soil. Géotechnique 45(1), 35–53 (1995)
Zhou, Y.F., Cheng, Z.L., Gong, B.W., et al.: The dilatancy and instability of an infilled material in a channel slope in Xinjiang. Chin. J. Rock Mech. Eng. (2017, accepted). In Chinese
Acknowledgements
The authors acknowledge the financial support of National Natural Science Foundation Project of China (Grant No. 515090181) and the Scientific Activity Project for Returned Oversea Scholars of MHRSS (Grant No. CKSD2016310/YT).
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2018 Springer Nature Singapore Pte Ltd.
About this paper
Cite this paper
Zhou, Yf., Gong, Bw., Tong, J., Li, Ca. (2018). Comparative Study on the Stress-Dilatancy of Xinjiang Loess Under Saturated and Unsaturated Conditions. In: Hu, L., Gu, X., Tao, J., Zhou, A. (eds) Proceedings of GeoShanghai 2018 International Conference: Multi-physics Processes in Soil Mechanics and Advances in Geotechnical Testing. GSIC 2018. Springer, Singapore. https://doi.org/10.1007/978-981-13-0095-0_11
Download citation
DOI: https://doi.org/10.1007/978-981-13-0095-0_11
Published:
Publisher Name: Springer, Singapore
Print ISBN: 978-981-13-0094-3
Online ISBN: 978-981-13-0095-0
eBook Packages: Earth and Environmental ScienceEarth and Environmental Science (R0)