摘要
为了有效控制新建线施工对既有线造成的影响,基于某实际工程,通过布辛奈斯克(Boussinesq)理论计算及ABAQUS有限元数值分析方法,对比分析正常土填筑与轻质土填筑、放坡与设置挡墙时既有高铁路基变形规律,并采用实际监测数据进行验证。研究表明,新建线路基填筑时,采用轻质土可以显著降低既有线路基的竖向变形,设置挡墙可以有效控制既有线路基的水平位移,既有线垂直于线路方向将发生从沉降到隆起的变形,且该隆起在施工后期将迅速回落。当线间距条件满足时,采用轻质土与设置挡墙相结合的方式,能够显著控制新建铁路对既有铁路造成的变形,路基施工过程中应加强全生命周期监测。
In order to effectively control the impact of the construction of a new line on the existing line,through the theoretical calculation of Boussinesq and the ABAQUS finite element numerical analysis method,methods including applying normal soil filling,lightweight soil filling,traditional grading and retaining walls were discussed respectively based on a project to get their effects on existing high-speed railway foundation deformation.Measured data were used for verification.Study shows that the use of lightweight soil can reduce the vertical deformation of the existing line foundation significantly,and the setting of retaining walls can effectively control its horizontal displacement.The existing line will deform from settlement to uplift if perpendicular to the direction of the line,and the uplift will quickly fall back in the later stage of construction.When the line spacing conditions are met,the combination of lightweight soil and retaining walls can significantly control the deformation of existing railways caused by new railways.The full life cycle monitoring should be adopted during the subgrade construction process.
作者
朱兴运
Zhu Xingyun(China Railway Design Corporation,Tianjin 300308,China)
出处
《铁道勘察》
2021年第1期41-45,共5页
Railway Investigation and Surveying
关键词
铁路路基
附加沉降
既有铁路
轻质土
挡墙
邻近施工
railway subgrade
additional settlement
existing railway
lightweight soil
retaining wall
adjacent construction
