›› 2012, Vol. 33 ›› Issue (7): 2167-2173.

• Geotechnical Engineering • Previous Articles     Next Articles

PSI and CRI joint algorithm used to monitor settlements of Sutong bridge foundation

ZHANG Ning-ning1, 2, CHEN Zhi-jian2, CHEN Yuan-jun3, BIAN Lei4   

  1. 1. China Huadian Electric Research Institute, Hangzhou 310030, China; 2. School of Earth Sciences and Engineering, Hohai University, Nanjing 210098, China; 3. Fujian Jianjiang Water Conservancy & Hydropower Consulting Co., Ltd., Fuzhou 350001, China; 4. Shandong Electric Power Engineering Consulting Institute Co., Ltd., Jinan 250013, China
  • Received:2011-04-14 Online:2012-07-11 Published:2012-07-13

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Abstract: Settlement is the key point for safety monitoring of super-large pile group foundation built on thick bed overburden. According to the question existing in the settlement monitoring of pile group foundation in Sutong bridge, PSI (permanent scatterers interferometry) and CRI (corner reflectors interferometry) technologies are synthetically applied to the settlement monitoring for Sutong bridge foundation. Combining with the permanent scatterers characteristics of the bridge and corner reflectors set up in the key monitoring site at bridge region, by processing 20 scenes SLC (signal look complex) data of Envisat acquired in the construction period from 2003 to 2008, differential interferometry is analyzed by CTM module in EV-InSAR software. The permanent scatterers points in the bridge area are picked out and the deformations of the points in different construction periods are calculated by PSI and CRI joint algorithm. It reflects the settlement of Sutong bridge foundation in the construction process objectively and roundly. Comparing settlement values gained by PSI with finite element calculation, the relative error is 4.64%. The result indicates that PSI and CRI joint algorithm is a powerful technology to monitor the foundation settlement of huge bridge's foundation. Along with continuous accumulation of SAR (synthetic aperture radar) data in the monitoring area, high-precision settlements of Sutong bridge foundation in operation period will be gradually obtained.

Key words: pile group foundation, settlement observation, PSI and CRI joint algorithm, finite element analysis

CLC Number: 

  • P 642
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