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深厚河床覆盖层地基上建设的超大型群桩基础,其沉降是安全监控的关键问题。针对苏通大桥群桩基础沉降监测中存在的问题,在基础沉降监测中综合运用了永久散射体干涉测量(PSI)和人工角反射器干涉测量(CRI)监测技术。结合大桥自身的永久散射体特性和桥位区重点监测部位安装的人工角反射器,利用EV-InSAR软件的CTM模块对该地区2003-2008年(主体工程施工期间)间获取的20景Envisat卫星单视复数据(SLC)进行差分干涉测量处理,利用PSI和CRI联合算法成功提取出了桥位区的永久散射体点,并解算出各永久散射体点在施工过程不同阶段的变形量,客观、全面地反映了苏通大桥在建设过程中基础的沉降。将获取的主墩处的永久散射体沉降量与有限元计算结果进行了对比,两者相对误差为4.64%。研究结果表明,PSI和CRI联合算法是一种极具潜力的大型桥梁地基基础沉降监测技术。随着监测区合成孔径雷达(SAR)数据的不断累积,利用该技术可以不断获取运营中的苏通大桥基础的高精度沉降量。
The settlement of super-large group pile foundation built on deep river bed foundation is the key problem of safety monitoring. In view of the problems existing in the settlement monitoring of pile foundation of Sutong Bridge, permanent scatterometry interferometry (PSI) and artificial corner reflector interferometry (CRI) monitoring techniques are applied in the monitoring of foundation settlement. Combining the bridge’s own permanent scatterer characteristics and the artificial corner reflector installed in the key monitoring area of the bridge area, the 20-scene Envisat satellite acquired during 2003-2008 (during the construction of the main project) in the area was analyzed using the CTM module of EV-InSAR software. Single-complex complex data (SLC) is used for differential interference measurement. The PSI and CRI joint algorithm are used to extract the permanent scatterers in the bridge region and calculate the deformation of each permanent scatterer at different stages of the construction process. Objectivity , A comprehensive reflection of the Sutong Bridge in the process of building the foundation of the settlement. The settlement of the permanent scatterer at the main pier obtained is compared with the finite element calculation. The relative error between the two is 4.64%. The results show that the combined algorithm of PSI and CRI is a kind of potential monitoring technique for foundation settlement monitoring of large bridges. With the continuous accumulation of synthetic aperture radar (SAR) data in the monitoring area, the technology can continuously obtain the high-precision settlement of the Sutong Bridge under operation.