铁道科学与工程学报2025，Vol.22Issue(5)：2126-2139,14.DOI:10.19713/j.cnki.43-1423/u.T20241178
三维富水加筋边坡抗震稳定性分析
Stability analysis of 3D reinforced slopes subjected to seismic force and pore water pressure
摘要
Abstract
Earthquakes and rainfall are two critical triggers of landslides,often occurring simultaneously.Slopes subjected to the combined impact of seismic forces and rainfall demonstrate significantly reduced stability,increased risk of landslides,and consequently,heightened potential for severe damage.In this paper,a horn failure model of 3D reinforced slopes was constructed,incorporating seismic forces and pore water pressure into the mechanical model.Using the upper bound theorem of limit analysis,the external power causing landslides and the internal energy dissipation rate resisting failure were calculated.Based on the principle of virtual power,an energy equation was established.The analytical solution for the stability coefficient of the 3D reinforced slope was derived.The optimal solution for the stability coefficient was obtained using the exhaustive method.The 3D attenuation behavior of reinforced slopes under the influence of earthquakes and pore water was analyzed,determining the appropriate reinforcement deployment method,reinforcement density,and slope cutting angle.The results indicate that,compared with existing research,there is a high degree of consistency,confirming the reliability of the findings presented in this paper.Earthquakes and pore water do not alter the 3D attenuation behavior of reinforced slopes,implying that the problem of 3D slope stability can be simplified to a 2D plane strain problem if B/H>5.The presence of earthquakes and pore water significantly diminishes the reinforcing benefits of 3D slopes,reduces the self-stabilizing capability of 3D reinforced slopes,and increases the risk of landslides.It is recommended to prioritize reinforcement methods that are sparse at the top and dense at the bottom,increase reinforcement density to enhance the reinforcing outcomes of three-dimensional slopes,and combine this with slope cutting and other methods to improve the seismic and slip resistance of 3D reinforced slopes.Considering both slope safety and engineering costs,the advisable design slope angle for reinforced slopes is between 30° and 45°.This work can provide theoretical guidance and a basis for the support design of similar 3D slopes in future.关键词
三维加筋边坡/地震/孔隙水/布筋密度/稳定系数Key words
3D reinforced slope/earthquake/pore water/reinforcement density/stability factor分类
建筑与水利引用本文复制引用
张佳华,杨永祥,源小梦,蒋贤勇,张标..三维富水加筋边坡抗震稳定性分析[J].铁道科学与工程学报,2025,22(5):2126-2139,14.基金项目
国家自然科学基金资助项目(52004088) （52004088）
湖南省教育厅科学研究优秀青年项目(23B0476) （23B0476）
