路堤衡重式挡墙体外扶壁加固结构数值模拟  

Numerical simulation on external counterfort reinforcement structure for embankment balance weight retaining wall

作　　者：唐凛 张俊逸 查旭东[2] TANG Lin;ZHANG Junyi;ZHA Xudong(Anhui Transportation Holding Group Co.,Ltd.,Hefei 230088,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha 410114,China)

机构地区：[1]安徽省交通控股集团有限公司,安徽合肥230088 [2]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《交通科学与工程》2023年第3期1-9,共9页Journal of Transport Science and Engineering

基　　金：国家自然科学基金资助项目(51878077);安徽省交通运输科技进步计划项目(201839)。

摘　　要：为研究既有路堤衡重式挡墙体外扶壁的加固技术,根据正交试验设计原理和单因素敏感性分析,采用Geostudio和FLAC3D软件,建立某实际工程挡墙边坡数值模型,对旧护栏立柱钢管加筋的体外混凝土扶壁加固挡墙结构进行模拟,分析挡墙墙身最大剪应力、最大拉应力和边坡稳定安全系数随扶壁加固结构设计参数改变的变化规律。研究结果表明:极端降雨工况下,既有挡墙的最大剪应力和最大拉应力超出了浆砌片石墙身强度设计要求,是墙身产生竖向开裂和局部鼓胀病害的主要原因;体外扶壁加固后,挡墙最大剪应力和最大拉应力显著降低,边坡稳定安全系数明显提高;扶壁的间距、厚度、高度及钢管的长度、间距等参数优化后,各验算指标均满足设计要求。该研究结果为类似重式挡墙加固工程提供参考。To research the external counterfort reinforcement technology for the existing embankment balance weight retaining wall,Geostudio and FLAC3D software were applied to establish the retaining wall slope model of the real project based on the orthogonal experimental design principle and the single factor sensitivity analysis method.The numerical simulation of the reinforced retaining wall structure with the external concrete counterfort reinforced by steel tube of waste guardrail post was carried out.The variation laws were analyzed for the maximum shear stress and maximum tensile stress of the retaining wall body as well as the safety coefficient of slope stability with change in the design parameters of the counterfort reinforcement structure.The results showed that the maximum shear stress and maximum tensile stress of the existing retaining wall exceed the design requirements of mortar rubble wall body strength under the working condition of extreme rainfall,which is the main reason for the retaining wall's vertical cracking and local bulging.After counterfort reinforcement,the maximum shear stress and maximum tensile stress of the retaining wall were significantly reduced,and the safety factor of slope stability was improved considerably.After optimizing the design parameters such as the spacing,thickness,and height of the counterfort as well as the length and spacing of the steel tube,all the checking indexes meet the design requirements.This could be used as a reference for the reinforcement project of the gravity retaining wall.

关 键 词：衡重式挡墙 扶壁加固 数值模拟 立柱钢管 

分 类 号：U417.11[交通运输工程—道路与铁道工程]