摘要
针对城市道路建设过程中新旧路基的沉降变形问题,评估了不同路基处理技术的有效性。通过广州市花都区某市政道路工程,建立了包括土工格栅加筋和泡沫轻质土填料的路基模型,并利用Abaqus有限元软件进行模拟分析,评估了利用土工格栅和泡沫轻质土等材料控制新旧路基沉降变形的效果。研究发现,土工格栅在新旧路基拼接部位的应用能显著提高路基稳定性,但达到一定的铺设层数后,单纯增加土工格栅铺设层数对位移控制的提升效果有限。泡沫轻质土作为轻质填料,随着填筑厚度的增加,其对新旧路基沉降变形的控制效果也变得显著。结合两种处理方式的优势并考虑工程造价成本因素,提出了一种土工格栅-泡沫轻质土联合处理方法,通过在新旧路基中下部位置铺设3层土工格栅并在上部填筑厚度为2 m的泡沫轻质土,能够有效控制新旧路基的沉降变形,提高路基的整体稳定性和使用寿命。
This study evaluates the effectiveness of different roadbed treatment methods regarding the settlement and deforma-tion of new and existing roadbeds during urban road construction.Using a municipal road project in Huadu District,Guangzhou as an example,a roadbed model including geogrid reinforcement and foam lightweight soil filler was established.The finite ele-ment analysis using ABAQUS software was used to conduct simulation with the roadbed construction improved with geogrid and foamed light weight soils.The effect of materials such as lightweight soil in controlling the settlement deformation of new and old roadbeds.Research results indicate that the application of the geogrids at the joints of the existing and new subgrades can significantly improve the stability of the subgrade.However,after reaching a certain number of laying layers,simply in-creasing the number of the geogrid laying layers has limited effect on improving displacement control.The foamed lightweight soil is used as a lightweight filler.As the filling thickness increases,its control effect on the settlement deformation of the new and old roadbed also becomes significant.Combining the advantages of the two treatment methods and considering the project cost factors,this study proposes a geogrid-foam lightweight soil joint treatment method by laying 3 layers of geogrids in the middle and lower parts of the old and new roadbed and filling the upper part.Foam lightweight soil with a thickness of 2m can effectively control the settlement deformation of new and old roadbeds and improve the overall stability and service life of the roadbed.
作者
张卓
黄锦盛
张晋宏
周书东
王成伟
张益
ZHANG Zhuo;HUANG Jinsheng;ZHANG Jinhong;ZHOU Shudong;WANG Chengwei;ZHANG Yi(China Railway Construction Engineering Group,Beijing 100160;Dongguan Building Science Research Institute Co.Ltd.,Dongguan 523809)
出处
《土工基础》
2025年第1期113-117,共5页
Soil Engineering and Foundation
关键词
市政道路
新旧路基
土工格栅
泡沫轻质土
数值模拟
Municipal Roads
New and Existing Roadbeds
Geogrids
Foamed Lightweight Soil
Numerical Simulation
