V形沟谷路堤空间效应与安全系数计算方法  

Calculation method for spatial effect and safety factor of V-shaped gully embankment

作　　者：阙云[1] 张吉松 朱啸辉 王之航 QUE Yun;ZHANG Jisong;ZHU Xiaohui;WANG Zhihang(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《公路交通科技》2025年第4期57-68,共12页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(41772297)。

摘　　要：【目标】针对V形沟谷地形对路堤稳定性的影响机制展开系统分析。【方法】以侧岸角度、沟底宽度、路堤填高、后缘坡度及前缘边坡系数为关键控制参数,采用强度折减理论与灰色关联分析法,从空间效应产生机理、影响因素敏感性、三维安全系数计算及空间效应产生条件4个维度构建研究体系。【结果】由于沟谷侧岸对路堤变形的约束,会产生不均匀位移,导致路堤内部的应力传递发生偏转,将部分土压力传递给侧岸,路堤内部会出现土拱现象,进而引发空间效应的产生;基于灰色关联度分析,揭示各因素的综合关联度由大到小排序为侧岸角度(0.936),沟底宽度(0.782),路堤填高(0.741),前缘边坡系数(0.661),而填土材料参数及本构模型对空间效应无显著影响。【结论】通过建立考虑真实地形特征的数值模型验证,本研究所提出的三维稳定系数计算方法相对误差小于5%,并可以大幅减少三维安全系数求解的工作量,可为复杂地形条件下路堤稳定性评估提供一定的理论依据。[Objective]This study systematically investigates the influence mechanisms of V-shaped valley topography on embankment stability.[Method]The side slope angle,valley bottom width,embankment fill height,rear slope gradient,and front slope coefficient were taken as the key controlling parameters.The strength reduction theory and grey correlation analysis method were adopted.A study framework was established from 4 dimensions,i.e.,spatial effect generation mechanism,factor sensitivity analysis,3D safety factor calculation,and spatial effect triggering conditions.[Result]The valley side slopes constrain embankment deformation,generating uneven displacements that deflect stress transfer within the embankment and partially transfer earth pressure to side slopes.This process induces soil arching phenomena within the embankment,subsequently triggering spatial effects.Grey correlation analysis reveals the comprehensive correlation degrees of influencing factors in descending order as side slope angle(0.936),valley bottom width(0.782),embankment fill height(0.741),front slope coefficient(0.661);while the fill material parameters and constitutive models show the negligible impacts on spatial effects.[Conclusion]The numerical modeling considering actual topographic features verifies that the proposed 3D stability coefficient calculation method achieves a relative error less than 5%,while significantly reducing the computational workload for 3D safety factor determination.The study provides theoretical foundations for embankment stability assessment under complex topographic conditions.

关 键 词：道路工程 路堤空间效应 强度折减法 V形沟谷 安全系数 

分 类 号：U416.12[交通运输工程—道路与铁道工程]