星载SAR干涉技术软基工程沉降监测与建模分析

Settlement monitoring and analysis of soft foundation engineering based on spaceborne SAR interferometry

软土地基处理过程中会导致地面沉降,在处理完成之后由于荷载变化及时间推移还可能进一步导致地面沉降,因此对地基的监测至关重要。传统监测方法费时费力,干涉合成孔径雷达(InSAR)技术则可以提供精确和空间密集的形变信息。以台州东部某软基工程为例,使用Sentinel-1A升轨SAR影像确定时空变形,并获取当地实测数据,建立形变模型,分析及预测研究区域的形变规律。结果表明,该区域都发生了不同程度的形变,防波堤内测沉降最大,雷达视线向最大变形量达到300mm以上。将模型的预测结果与InSAR方法处理结果进行对比,得到RMSE为9mm/yr,相关系数为0.99,说明InSAR方法在软基工程形变监测及预测分析中可以达到厘米级的精度。

The treatment of soft soil foundation will lead to land subsidence,which maybe further caused by load changes and the passage of time after the treatment.Therefore,the monitoring of soft foundation engineering is vital.Traditional monitoring methods are time-consuminggand labor-intensive.Interferometric Synthetic Aperture Radar(InSAR)can provide accurate and space-intensive deformation information.Taking a soft foundation project in eastern Taizhou as an example,Sentinel-1A ascending orbit SAR images are used to determine the temporal and spatial deformation data,which are used to establish a deformation model for analyzing and prediction of the deformation in the study area.The results show that various degrees of deformation have taken place in this area,the maximum settlement in the breakwater is measured which is over 300mm in the radar line of sight.Comparing the prediction results of the model with the results of InSAR method,the RMSE is 9mm/yr and the correlation coefficient is O.99,which shows that the InSAR method can achieve centimeter-level accuracy in deformation monitoring and prediction analysis of soft foundation engineering.