基坑开挖对既有道路路基变形的影响分析

Influence of Excavation of Foundation Pit on Deformation of Existing Subgrade

为了探究基坑开挖对邻近道路路基变形的影响,依托软土地区某典型基坑工程,采用大型通用有限元数值分析软件ABAQUS对此开挖工程进行建模,研究基坑开挖时的不同开挖深度和不同支护系统对路基变形的影响,并对比不同工况下路基表面的沉降量和水平位移值。分析结果表明:随着开挖深度的增加,路基顶面竖向变形量和路基边坡水平变形量都随之增加;同一开挖深度、同一支护系统下路面的水平位移受与基坑水平距离的影响相对较小。因此基坑开挖过程中应减少每次开挖的深度,避免对路基影响过大。研究成果可为类似基坑开挖工程设计提供计算依据,推进基坑开挖对道路影响的研究。

In order to explore the influence of excavation of foundation pit on the deformation of adjacent subgrade, the finite element model of excavation engineering is established based on a typical foundation pit project in soft soil area. The main analysis content is the influence of different excavation depth and different supporting system on the deformation of adjacent subgrade by comparing the pavement settlement and horizontal displacement of subgrade surface under different working conditions. The analysis results show that the vertical deformation of the subgrade surface and the horizontal deformation of the subgrade slope increase with the increase of excavation depth;the horizontal displacement of the pavement under the same excavation depth and the same supporting system is less affected by the horizontal distance from the foundation pit. So the depth of each excavation should be reduced to avoid the excessive impact of the foundation pit. The results of study could provide calculation basis for the similar design and advance the study on the influence of excavation of foundation pit on roads.