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Effect of the characteristics of surface cracks on the transient saturated zones in colluvial soil slopes during rainfall

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Abstract

The presence of surface cracks has a great influence on the formation of transient saturated zones, which are one of the main factors affecting the stability of colluvial soil slopes during rainfall. This paper aims to examine how the distribution characteristics, such as depth (h), angle (θ), and location of surface cracks, influence the development of transient saturated zones. For this reason, a series of numerical simulations involving colluvial soil slopes is performed. The results show that the development of transient saturated zones in a slope with a crack and that in an intact slope are quite different. In a cracked slope, rainwater infiltrates into the slope along the crack and forms a transient saturated zone at the crack tip. It is found that the smaller the crack depth is, the easier it is for the transient saturated zone at the crack tip to connect with that in the shallow layer, leading to an increase in the area of the transient saturated zone in the shallow layer. Moreover, the larger the crack angle is, the more easily the transient saturated zone at the crack tip connects with both the transient saturated zone in the shallow layer and the groundwater, forming a transient saturated zone that penetrates the entire colluvium. In addition, the lower the location of the crack along the slope surface is, the shorter the time is for the formation of a transient saturated zone at the crack tip, and the larger the area of the transient saturated zone.

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Acknowledgments

This work was supported by the National Key Research and Development Program of China [No. 2017YFC0805307]; the National Natural Science Foundation of China [No. 51838001, No. 51878070, No. 51878078, No. 5181102194 and No. 51678074]; the Excellent Youth Foundation of Natural Science Foundation of Hunan Province [No. 2018JJ1026]; the Key Project of Education Department of Hunan Province [No. 17A008]; the Postgraduate Research and Innovation Project of Hunan Province [No. CX2018B528]; and the Open Fund of Engineering Research Center of Catastrophic Prophylaxis and Treatment of Road & Traffic Safety of Ministry of Education (Changsha University of Science & Technology) [No. kfj170404].

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Authors and Affiliations

  1. School of Civil Engineering, Changsha University of Science & Technology, Changsha, 410114, China

    Ling Zeng & Liu-Yi Xiao

  2. National Engineering Laboratory of Highway Maintenance Technology, Changsha University of Science & Technology, Changsha, 410004, China

    Jun-Hui Zhang

  3. School of Traffic & Transportation Engineering, Changsha University of Science & Technology, Changsha, 410114, China

    Qian-Feng Gao

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  1. Ling Zeng
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  2. Liu-Yi Xiao
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  3. Jun-Hui Zhang
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  4. Qian-Feng Gao
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Correspondence to Jun-Hui Zhang.

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Zeng, L., Xiao, LY., Zhang, JH. et al. Effect of the characteristics of surface cracks on the transient saturated zones in colluvial soil slopes during rainfall. Bull Eng Geol Environ 79, 699–709 (2020). https://doi.org/10.1007/s10064-019-01584-1

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  • DOI: https://doi.org/10.1007/s10064-019-01584-1

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