PS-InSAR技术对上海高架路的沉降监测与归因分析

Attribution Analysis on Deformation Feature of the Shanghai Elevated Highway by Persistent Scatterer SAR Interferometry

上海市高架道路是上海市重大基础设施工程之一,跨越11个行政区,打通了城市交通脉络。为保证其安全运营和可持续发展,利用高分辨率永久散射体雷达干涉测量技术对高架路进行沉降监测,沉降结果与同期水准数据基本保持一致,最大误差不超过3mm/a。进一步联合高架路的结构特性、运营车辆的动荷载情况、高架路施工进程,分析了提取的高架路沉降的空间分布情况以及时间演化行为。多因素的归因分析结果表明,上海市高架道路沉降格局与周边区域地面沉降密切相关,同时与高架道路自身荷载和运营车辆动荷载、高架道路建成时间有关。

Elevated highway is one of the major infrastructures in Shanghai spanning 11 administrative regions. In order to ensure its safe operation and sustainable development, high-resolution persistent scatterer interferometric synthetic aperture radar(PS-InSAR) technology is used to monitor and analyze the displacement of the elevated highway, combining with the level data to further verify the monitoring accuracy. The settlement results are basically consistent with the leveling data, and the maximum error does not exceed 3 mm/a.The results of multi-factor attribution analysis show that the settlement pattern of elevated roads is closely related to the land subsidence in the surrounding areas, the dynamic load of the operating vehicles, and the time about elevated road was built.