福州长乐滨海路堤边坡渗流稳定性数值研究  

Numerical Research on Seepage Stability of the Changle Coastal Embankment Slope in Fuzhou

作　　者：蔡沛辰 阙云[1] 马怀森 CAI Pei-chen;QUE Yun;MA Huai-sen(School of Civil Engineering,Fuzhou University,Fuzhou 350116,China)

机构地区：[1]福州大学土木工程学院,福州市350116

出　　处：《公路》2021年第11期27-31,共5页Highway

基　　金：国家自然科学基金资助项目,项目编号41772297;福建省自然科学基金资助项目,项目编号2018J01771。

摘　　要：为探究不同水位路堤边坡稳定性影响机理,结合强度折减理论与COMSOL Multiphyscis有限元软件,以福州长乐滨海路堤边坡工程为例,分别对不同水位路堤边坡的水压力、滑移量及破坏机理进行研究。结果表明:路堤边坡浸水面上,压力水头从0m到水位高度分布不等,而渗水面上水头始终为0m;浸水面和渗水面上水压力都沿坡顶至坡底呈增大趋势,且水压力值随水位升高逐渐增大;水位越高,坡脚滑移量越大,而安全系数FOS越低,同时边坡渗流稳定性愈差;水位高低对塑性应变影响较小;同一水位下,滑移面随折减系数SRF增大,由局部小范围不规则状逐渐演化为大范围圆弧状,同时塑性应变数值增幅巨大,可达90%以上;临界破坏状态时,渗水面上坡脚至坡顶出现贯通的圆弧带状塑性区,坡脚以下塑性区平行于地基水平面,且坡脚塑性应变最大。综上,对路堤边坡进行二维平面应变分析,可在一定程度预测边坡土体渗流的稳定性,采用拉伸数据集实现3D可视化,有效减缓了直接3D仿真不收敛的数值求解问题。In order to explore the influence mechanism of embankment slope stability under different water levels,combining the strength reduction theory and COMSOL Multiphyscis finite element software,taking the Changle coastal embankment slope project at Fuzhou city as background,the water pressure,slippage value and damage mechanism of embankment slopes under different water levels are studied.The results show that the pressure head varies from 0 mto the height of the water level on the submerged surface of the embankment slope,while the water head is always 0 mon the seepage surface.The water pressure on both the flooding surface and the seepage surface show an increasing trend from the top to the bottom of the slope,and the water pressure value gradually increases with the increase of the water level.The higher the water level,the greater the slippage at the slope foot,the lower the safety factor FOS,and the worse the slope seepage stability.The water level has minor impact on plastic strain.Under the same water level,with the increase of the reduction coefficient SRF,the slip surface gradually evolves from a small local irregularity to a large-scale arc shape.At the same time,the plastic strain value increases greatly,reaching up to 90%and higher.At the critical failure state,apenetrating circular arc band-shaped plastic zone appears from the toe to the top of the slope on the seepage surface.The plastic zone below the toe is parallel to the ground level,and the plastic strain of the slope angle is the largest.In conclusion,the two-dimensional plane strain analysis of the embankment slope can predict the stability of the slope soil seepage to a certain extent,and the stretch data set is used to realize 3 Dvisualization,which effectively alleviate the numerical solution problem of direct 3 Dsimulation non-convergence.

关 键 词：浸水路堤 边坡稳定性 强度折减理论 流-固耦合 安全系数 

分 类 号：U416.1[交通运输工程—道路与铁道工程]