Abstract
Highways built on soft clay subgrade are more prone to subsidence due to the geotechnical characteristics of soft clay. Monitoring ground movements in this area is significant for understanding the deformation dynamics and reducing maintenance cost as well. In this paper, small baseline subset synthetic aperture radar interferometry (SBAS-InSAR) technique is exploited to obtain and investigate the time series ground surface deformation after the construction of a road embankment over soft clay settlement. Considering the important effect of temporal deformation models on the final accuracy of estimated deformation, both the linear velocity model and seasonal deformation model are utilized to conduct the comparative investigation of deformation time series. Two highways in Fuoshan, China—G1501 Guangzhou Belt Highway and Lungui Highway—were selected as the test area. Thirteen TerraSAR-X images acquired from October 2014 to November 2015 were analyzed. Comparative study based on two groups of analyses generated from the two models for both highways were conducted. Consequently, several feature points distributed near the two highways were analyzed in detail to understand the temporal evolution of the settlement. In order to evaluate the reliability of our measurements, the residual phase was analyzed to assess the modelling accuracy of the two models. In addition, leveling data were also used to validate the experimental results. Our measurements suggest that the seasonal model is more suitable for the test highways, with an accuracy of ±3 mm with respect to the leveling results.
Highlights
Long-term monitoring of highways built on soft clay settlement after the construction of road embankments plays a significant role in preventing the long-term damage and economic losses induced from long-term subsidence and ensuring the project quality of highways [1]
SBAS-InSAR Technology Based on the Linear Model
The basic principle of SBAS-InSAR technology is to generate time series deformation based on a least square method, with the deformation maps generated by multi-single differential InSAR (D-InSAR) as the input observation dataset [23,24]
Summary
Long-term monitoring of highways built on soft clay settlement after the construction of road embankments plays a significant role in preventing the long-term damage and economic losses induced from long-term subsidence and ensuring the project quality of highways [1]. In China, a large number of highways are built on soft clay under complicated geotechnical conditions, such as roads crossing agricultural paddies, lake areas, or valleys. Due to the geotechnical characteristics of large natural moisture content, high compressibility, low intensity, and unconsolidated structure, soft clay is more prone to ground subsidence under the action of traffic load. The stability control of soft clay subgrade. G1501 and Lungui Highway are two examples of highways built on soft clay located in Fuoshan, Guangdong
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
