上海轨道交通浦江线运营期沉降特性分析

Analysis on settlement characteristics of Shanghai Metro Pujiang Line during operation period

本文对浦江线运营期长达3年的沉降监测数据进行分析,结合沿线设计资料、周边环境条件、工程地质条件等资料分析了线路各区间工后沉降特征及其影响因素。分析结果表明:沿线最大累计沉降量为6.88mm,相邻墩台最大差异沉降量为2.74mm,在运营开始约12个月后,各区间沉降速率趋于稳定,沉降达到稳定状态。沿线受古河道影响存在两个明显的沉降凹槽,主要是因桩周软弱土层固结沉降量增大和桩长加长后弹性变形量增大所致。

Based on the analysis of the settlement monitoring data during the three years of the operation of Pujiang Line, combined with the design data, surrounding environmental conditions and engineering geological conditions, the post-construction settlement characteristics and influencing factors of each interval of Pujiang Line are analyzed. The analysis results show that: the maximum cumulative settlement is 6.88 mm, and the maximum differential settlement of adjacent pier is 2.74 mm. After about 12 months of the operation, the settlement rate tends to be stable and the settlement reaches a stable state in each interval. There are two obvious settlement grooves along the line affected by the fossil river course, which are mainly caused by the increase of the consolidation settlement of the soft soil around the piles and the increase of elastic deformation after the pile length is lengthened.