沪宁城际铁路桥涵过渡段工程沉降观测分析

Observation and Analysis of Settlement of Transition Section between Railway and Bridge of Shanghai-Nanjing Intercity Railway

研究目的:过渡段是刚性桥台或其它构筑物与柔性路堤的结合部位,在结构上是塑性变形和刚度的突变体,施工过程中必须采取措施减少两者之间的塑性变形差,控制工后沉降,实现平稳过渡。本文结合沪宁城际铁路站前Ⅳ标相关过渡段工程,对施工过程及工后沉降观测数据进行分析,总结沉降规律。研究结论:采用级配碎石处理过渡段工程,沉降总量不大但沉降呈现一定规律。过渡段最大沉降发生在距结构物10～15m处,沉降大小与填土高度成正比,沉降速率与填筑时间正相关。工后随着"堆载预压",总体沉降量将趋于稳定。

Research purposes：The transition section is a joint section between rigid abutment or other structures and flexible embankment and it is a mutant of plastic deformation and rigidity in structure.So during the construction,the measures must be taken for reducing the plastic deformation difference between them,to control post-construction settlement and to achieve smooth transition.Combination of the relevant transition section of Pre-station Bidding IV of Shanghai-Nanjing intercity railway,this paper analyzes the observed data on the settlements during construction and after construction,and summarizes the settlement law.Research conclusions：Using graded gravel to reinforce the transition section,the total amount of settlement is not large with a regular pattern.The largest amount of settlement of the transition section occurs at the area where is 10-20 m away from structures,and the amount of settlement is proportional to filling height,and the settlement velocity is in the positive correlation with filling time.With the ＂heaped loading and pre-pressing＂ after construction,the overall settlement tends to steady state.