This paper reports the integration of the Ground Penetrating Radar (GPR) and the Interferometric Synthetic Aperture Radar (InSAR) techniques for the monitoring of the rail-abutment transition area in railway bridges. To this purpose, an experimental campaign was conducted on a rail truss bridge located in Puglia, Southern Italy. On one hand, GPR was used to obtain structural details of the subsurface (thickness of the ballasted layer, position of the sleepers, presence of clay/humidity spots) and to identify potential construction-related issues. Parallel to this, InSAR analyses were mainly addressed to monitor subsidence at the rail-abutment transition area. Outcomes of this investigation outlined presence of subsidence at both the areas of transition and have proven the proposed integrated approach as viable to achieve a more comprehensive assessment of the structural integrity of railway bridges.

本文报告了探地雷达（GPR）和干涉合成孔径雷达（InSAR）技术的集成，用于监测铁路桥梁的铁路桥台过渡区域。为此，在位于意大利南部普利亚大区的铁路桁架桥上进行了一次实验。一方面，GPR用于获取地下的结构细节（压载层的厚度，轨枕的位置，粘土/潮湿点的存在）并确定与施工有关的潜在问题。与此同时，InSAR分析主要用于监视铁路桥台过渡区的沉降。