Investigation of Dynamics Observation of Slope face using Ground Based Synthetic Aperture Radar for Large-scale Civil Construction

Abstract

Ground Based Synthetic Aperture Radar (GB-SAR) can monitor a wide range of displacement with high accuracy. In recent years, research has been progressed as a long-term monitoring method with steep terrain that is difficult to enter and wide-ranging landslide.

This time, the measurement characteristic of GB-SAR was verified as a monitoring method of cut slope surface for large scale cutting work which is the restoration work of the Kumamoto earthquake. A GB-SAR was installed at a position about 800m from the slope as the observation target, and measurement was carried out for 3 months. In order to verify the accuracy of GB-SAR, GNSS measurement were conducted, which is the conventional method at the same time, and confirmed that it has comparable accuracy by comparing the results. As a result, we were able to complete the construction while grasping the stability of the entire slope surface under severe weather conditions. In this paper, the outline of GB-SAR, observation method under construction and on the comparison of measurement result with GNSS are reported.