地基雷达干涉测量技术在滑坡灾后稳定性评估中的应用

针对2014-09-01大树场镇大面积山体滑坡灾后稳定性,从IBIS-L地基雷达形变测量原理和关键技术(步进频率连续波和合成孔径雷达)入手,给出地基InSAR数据处理流程,获得了滑坡灾后高精度、高时空分辨率的形变演化特征,测量精度达到亚mm级。地基InSAR结果表明,滑坡体滑动幅度较大的区域位于滑坡体左侧中上部(120mm)和右侧中上部(75mm)。滑动主要由堆积松散土在裂隙水、雨水等作用下造成,产生较大次生灾害的可能性较小。

Application of Monitoring Stability after Landslide Based on Ground-Based InSAR

The IBIS-L ground-based SAR monitors the displacement of an observed object by combining of the stepped frequency continuous wave, synthetic aperture radar and an interferometry technique. To monitor the displacement after the landslide in Dashuchang town on September 1, 2014, we first discuss the key technology of the IBIS-L ground-based InSAR and the ground-based SAR system. Second, we summarize InSAR data processing flow. Then third, obtain displacement evolution characteristics with sub-millimeter precision and high spatial-temporal resolution. GB-InSAR results show that displacements of the middle-upper parts on the left and right sides of the landslide body are 120 mm and 75 mm respectively. This is caused by crack water and rain. Displacements of landslide body are impossible to produce larger secondary geological disasters.