摘要
研究目的:盾构法施工对周围土体及既有建筑物的影响极为复杂,分析盾构施工过程中对周围既有桥梁基础的影响具有重要的工程价值和研究意义。本文以某隧道开挖的工程实例为背景,采用ABAQUS通用有限元软件,建立了结构的三维有限元模型,考虑了土体及其与结构间的非线性特性,模拟了盾构法隧道开挖的完整施工过程,最终得到了盾构施工过程中既有桥梁的承台和桩基础的变位规律。研究结论:分析表明,在开挖过程中,在开挖掌子面压力的作用下,前方土体隆起,最大隆起量为4.287 mm;由于开挖引起的土体损失、土体应力释放以及盾尾空隙的共同作用,导致盾构正上方及盾构后方的土体发生沉降,最大沉降量为6.651 mm。盾构施工过程中,承台将发生较大的竖向、横向和纵向变位,不可忽略。进行既有桥梁上部结构分析时应考虑承台的基础变位影响。
Research purposes：The shield tunneling has the complicated impact on surrounding soil and existed structures,and analysis of the impact of the shield tunneling on the surrounding bridge foundation has significant engineering value and research meaning.Taking a tunnel excavation project as the background,a 3D finite element model is established by using ABAQUS to simulate the whole shield tunnelling process on considering the nonlinear characteristics of the soil-structure,and the displacement laws of the bridge abutment and pile foundation in the course of the shield tunneling are obtained. Research conclusions：The results show that the soil in the place ahead rise to the maximum volume of 4.287 mm under the effect of excavation pressure of the working face,and the soils above and at back of the shield settle with the maximum settlement volume of 6.651 mm under joint effects of the soil loss,stress release and gap of shield end caused by the tunneling.Furthermore,the vertical,transverse and longitudinal displacements of bridge abutment while tunneling can not be ignored.The impact of the base displacement of the abutment should be considered while analyzing the bridge superstructure.
出处
《铁道工程学报》
EI
北大核心
2011年第6期14-20,共7页
Journal of Railway Engineering Society
关键词
盾构施工
桥梁
三维有限元
动态模拟
相互作用
基础变位
shield tunnelling
bridge
3D finite element
dynamic simulation
interaction
foundation displacement
