Nanjing Dashengguan Bridge Monitoring

Challenge

The Nanjing Dashengguan Bridge is a high-speed railway bridge crossing the Yangtze River. As one of the key control projects of the Beijing-Shanghai High-Speed Railway, it became the world's first six-track railway bridge, the longest-span high-speed railway bridge, and the highest design-load high-speed railway bridge. Long-span steel structures are highly sensitive to thermal expansion, requiring precise separation of thermal noise from structural deformation.

Solution

Applied DeepInSAR's Phase Unwrapping Network optimization to isolate thermal noise from structural deformation. Our SAR Interferometry infrastructure deformation monitoring system uses redundant observations to optimize phase unwrapping networks, achieving unprecedented accuracy in bridge deformation tracking.

Result

Achieved sub-millimeter correlation with ground-based GNSS sensors over a 3-year monitoring period. Successfully mapped deformation rates and thermal expansion coefficients across all bridge segments, with deformation time series validated against temperature records.

Scientific Results

Figure 1: Top: Deformation rate map (A) and thermal expansion coefficient map (B). Bottom: Time-series at monitoring points P1-P6, where blue represents deformation and green represents temperature. Maximum thermal expansion: 0.82 mm/°C at P3.

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