摘要
为解决重庆奉节-巫山交界的大溪河区域拟建桥梁选址问题,针对研究区大气情况复杂多变且地质灾害多发的现实情况,采用SBAS-InSAR技术对该区域进行2018年10月—2021年11月的时序地表形变监测,对比了3种大气延迟校正方法并采用GACOS大气延迟校正方法对研究区大气延迟相位进行了校正,结果表明区域内整体平稳,局部有较高速率的地表形变,形变速率值处于-62 mm/a~30 mm/a之间。基于监测结果,综合已有资料和遥感影像,提取到5个异常区域并利用地质灾害影响因子信息建立逻辑回归模型,划分区域地质灾害风险区。将风险分区结果与SBAS-InSAR形变监测结果进行叠加分析,筛选得到2个待选稳定桥址,最后加以工程地质因素分析,确定适宜桥址区域,对辅助桥址选择及桥梁安全提供理论支撑。
The stability of bridge site is the basis of bridge safety.In order to solve the problem of site selection of the proposed bridge in Daxi river area at the junction of Fengjie and Wushan in Chongqing,this paper uses SBAS-InSAR technology to conduct three-year sequential surface deformation monitoring in this area from October 2018 to November 2021.In view of the fact that the study area is in mountainous areas and the atmosphere is complex and changeable,Three kinds of atmospheric delay correction methods are compared and gacos atmospheric delay correction method is used to correct the atmospheric delay phase in the study area.The results show that the whole area is stable,and there is a high rate of surface deformation in some parts.The deformation rate is between-62 mm/a and 30 mm/a.Based on the monitoring results,combined with the existing data and remote sensing images,five abnormal areas are extracted,and a logistic regression model is established by using the information of geological disaster impact factors to divide the regional geological disaster risk areas.The risk zoning results and SBAS-InSAR deformation monitoring results are superimposed and analyzed,and two stable bridge sites to be selected are selected.Finally,the engineering geological factors are analyzed to determine the appropriate bridge site area,which provides theoretical support for the selection of auxiliary bridge sites and bridge safety.
作者
潘建平
袁雨馨
李鹏霞
赵瑞淇
付占宝
PAN Jianping;YUAN Yuxin;LI Pengxia;ZHAO Ruiqi;FU Zhanbao(School of Smart City,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《测绘科学》
CSCD
北大核心
2023年第1期110-116,156,共8页
Science of Surveying and Mapping
基金
宁夏自治区重点研发计划项目(2022CMG02014)
关键词
时序InSAR
桥址选择
大气延迟校正
time series InSAR
bridge site selection
atmospheric correction
