华北平原地面沉降对高速铁路桥梁工程的影响研究

Influence of land subsidence on the bridge of high speed railway in North China plain

采用离心模型试验及数值模拟方法对抽水引起地面沉降进行过程及影响分析,并进一步采用有限单元法对实测地面沉降条件下的典型地段桥梁工程进行了模拟分析。研究表明,在抽水井附近及地面沉降的中心区域,不均匀沉降较为严重,对桥梁结构变形影响较大,对不同结构形式的桥梁影响有所不同;在地面沉降的扩展区域内,表现为桥梁与地基一同下沉,对高速铁路桥梁工程影响不大。需采取适宜的对策和措施进行防治。

Centrifugal model tests and numerical simulation are conducted to investigate behaviors of ground settlement due to grotmdwater exploitation and to demonstrate the influence of land subsidence on three types of bridges. By use of the elasto-plastic finite element analysis method, the structural transformation of the bridge in the typical section of the high speed railway with the influence of land subsidence is studied. At the center district of land subsidence and in the vicinity of the well, the asymmetrical subsidence is more serious, and has larger influence on the bridge structure than the regional land subsidence does. It can be prevented and cured by adopting engineering measures.