Three-dimensional dynamic stability analysis of vegetation-rooted slopes

IF 3.7 2区工程技术 Q3 ENGINEERING, ENVIRONMENTAL Bulletin of Engineering Geology and the Environment Pub Date : 2024-11-06 DOI:10.1007/s10064-024-03984-4

Chen Guang-Hui, Wang Ling, Ouyang Xu, Jiang Han

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Abstract

In this study, an analytical model for the three-dimensional (3D) dynamic stability analysis of vegetation-rooted slopes is first developed under steady-state unsaturated flow conditions. Root reinforcement, defined as the increase in the soil shear strength produced by the mechanical and hydrological effects of vegetation roots, is included in the proposed analytical model. By combining the modified pseudo-dynamic approach (MPDA) and the kinematic theory of limit analysis to the 3D discretized failure model, the most critical failure surface and the corresponding factor of safety (FS) are derived to examine the stability of vegetation-rooted slopes with the aid of the optimization algorithm of particle swarm. The proposed approach is verified by comparing with published analytical solutions and numerical results. A series of parametric analysis are then conducted to examine the influence of seismic-related parameters, vegetation properties, possible surcharge and slope geometry parameters on the slope stability. Finally, a comparison between the slope stability under different root architectures is provided and discussed. The results show that, for these selected cases, the stability of vegetation-rooted slopes is significantly improved by approximately 45% compared to bare soil slopes, and the divergences of reinforcement effects between different root architectures can be negligible.

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植被扎根斜坡的三维动态稳定性分析

在本研究中，首先建立了稳态非饱和流条件下植被根系边坡的三维（3D）动态稳定性分析模型。根系加固被定义为植被根系的机械和水文效应所产生的土壤抗剪强度的增加。通过将修正伪动态法（MPDA）和极限分析运动学理论与三维离散破坏模型相结合，得出了最临界破坏面和相应的安全系数（FS），并借助粒子群优化算法对植被根系边坡的稳定性进行了检验。通过与已公布的分析解和数值结果进行比较，验证了所提出的方法。然后进行了一系列参数分析，以研究地震相关参数、植被特性、可能的附加荷载和边坡几何参数对边坡稳定性的影响。最后，对不同根系结构下的斜坡稳定性进行了比较和讨论。结果表明，在这些选定的情况下，与裸土斜坡相比，植被根系斜坡的稳定性显著提高了约 45%，而且不同根系结构之间的加固效果差异可以忽略不计。

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来源期刊

Bulletin of Engineering Geology and the Environment 工程技术-地球科学综合

CiteScore

7.10

自引率

11.90%

发文量

445

审稿时长

4.1 months

期刊介绍： Engineering geology is defined in the statutes of the IAEG as the science devoted to the investigation, study and solution of engineering and environmental problems which may arise as the result of the interaction between geology and the works or activities of man, as well as of the prediction of and development of measures for the prevention or remediation of geological hazards. Engineering geology embraces: • the applications/implications of the geomorphology, structural geology, and hydrogeological conditions of geological formations; • the characterisation of the mineralogical, physico-geomechanical, chemical and hydraulic properties of all earth materials involved in construction, resource recovery and environmental change; • the assessment of the mechanical and hydrological behaviour of soil and rock masses; • the prediction of changes to the above properties with time; • the determination of the parameters to be considered in the stability analysis of engineering works and earth masses.