Three-dimensional slope stability and anti-slide pile treatment of Zhangjiayao landslide under rainfall
ISSN: 0264-4401
Article publication date: 23 October 2023
Issue publication date: 5 December 2023
Abstract
Purpose
To solve the instability problem of Zhangjiayao landslide caused by rainfall, the internal mechanism of slope instability and the supporting effect of anti-slide piles are studied. The research results can provide theoretical basis for the prevention and control of loess landslides.
Design/methodology/approach
A three-dimensional finite element model of Zhangjiayao landslide is established by field geological survey, laboratory test and numerical simulation.
Findings
The results show that Zhangjiayao landslide is a loess-mudstone contact surface landslide, and rainfall leads to slope instability and traction landslide. The greater the rainfall intensity, the faster the pore water pressure of the slope increases and the faster the matrix suction decreases. The longer the rainfall duration, the greater the pore water pressure of the slope and the smaller the matrix suction. Anti-slide pile treatment can significantly improve slope stability. The slope safety factor increases with the increase of embedded depth of anti-slide pile and decreases with the increase of pile spacing.
Originality/value
Based on the unsaturated soil seepage theory and finite element strength reduction method, the failure mechanism of Zhangjiayao landslide was revealed, and the anti-slide pile structure was optimized and designed based on the pile-soil interaction principle. The research results can provide theoretical basis for the treatment of loess landslides.
Highlights
A three-dimensional finite element model of Zhangjiayao landslide is established.
Zhangjiayao landslide is a loess-mudstone contact surface landslide.
The toe of Zhangjiayao slope is first damaged by heavy rainfall, resulting in traction landslide.
The deformation of Zhangjiayao slope is highly dependent on rainfall intensity and duration.
The anti-slide pile can effectively control the continuous sliding of Zhangjiayao slope.
Keywords
Acknowledgements
Project (51509211) funded by National Natural Science Foundation of China; Project (2016M602863) funded by China Postdoctoral Science Foundation; Project (2018031) funded by Excellent Science and Technology Activities Foundation for Returned Overseas Teachers of Shaanxi Province; Project (2015SF260) funded by Social Development Foundation of Shaanxi Province; Project (2017BSHYDZZ50) funded by Postdoctoral Science Foundation of Shaanxi Province; Project (SZ02306) funded by Shaanxi Key Laboratory of Safety and Durability of Concrete Structures, Xijing University; Project (XKLGUEKF21-02) funded by Xi'an Key Laboratory of Geotechnical and Underground Engineering, Xi'an University of Science and Technology.
Citation
Han, C.-X., Hou, T.-S. and Chen, Y. (2023), "Three-dimensional slope stability and anti-slide pile treatment of Zhangjiayao landslide under rainfall", Engineering Computations, Vol. 40 No. 9/10, pp. 2667-2692. https://doi.org/10.1108/EC-03-2023-0128
Publisher
:Emerald Publishing Limited
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