铁道标准设计2017，Vol.61Issue(5)：40-45,6.DOI:10.13238/j.issn.1004-2954.2017.05.009
墩台基坑开挖过程中列车动载对路堤的动变形分析
Dynamic Deformation Analysis of Train Moving Load on Embankment during Excavation of Pier Foundation Pit
摘要
Abstract
A large number of new bridge pier foundation pit engineering projects are located within the scope of railway subgrade protection, making the railway inevitably affected by the excavation of the foundation pit and the train dynamic load exacerbates the adversity.To ensure the safety of the adjacent railway in the process of foundation pit excavation, a three-dimensional finite element numerical model is established to analyze the dynamic deformation of embankment during the excavation of foundation pit adjacent to existing railway line subject to passenger cars and freight car at different speeds with reference to the construction of bridge piers of SunDu extra-long bridge.With downward vertical pit excavation, the roadbed center displacement and horizontal displacement are all increased, and the level of displacement is greater than the growth rate of vertical displacement of growth rate.The subgrade center vertical maximum displacement are respectively 3.32mm and 3.42mm under 60km/h car and 40km/h wagon loads, and it is more than 3.5mm for other cases.Finally, the control limit of 3.5mm railway subgrade dynamic deformation in the process of foundation pit excavation subject to speed limit of 60km/h passenger car and 40km/h freight car is proved applicable.关键词
列车动载/基坑开挖/动变形/路堤/数值分析Key words
Train dynamic load/Excavation of foundation pit/Dynamic deformation/Embankment/Numerical analysis分类
交通工程引用本文复制引用
郑明新,刘家桦,杨继凯,胡国平..墩台基坑开挖过程中列车动载对路堤的动变形分析[J].铁道标准设计,2017,61(5):40-45,6.基金项目
国家自然科学基金项目(51568022) （51568022）
江西省高等学校科技落地计划项目(KJLD13036) （KJLD13036）
