基于PS-InSAR超载下隧道纵向沉降预测方法  

Prediction Method of Tunnel Longitudinal Settlement under Surface Overload Based on PS-InSAR

作　　者：谢雄耀[1,2] 柴隆 李攀[2] 王承 Xie Xingyao;Chai Long;Li Pan;Wang Cheng(Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education,Tongji University,Shanghai 200092,P.R.China;Department of Geotechnical Engineering,School of Civil Engineering,Tongji University,Shanghai 200092,P.R.China;State Grid Shanghai Electric Power Company,Shanghai 200072,P.R.China)

机构地区：[1]同济大学岩土及地下工程教育部重点实验室,上海200092 [2]同济大学土木工程学院地下建筑与工程系,上海2000092 [3]国网上海电力公司,上海200092

出　　处：《地下空间与工程学报》2023年第5期1656-1664,共9页Chinese Journal of Underground Space and Engineering

基　　金：国家自然基金重点项目(52038008);国网上海市电力公司科技项目(52090W220001)。

摘　　要：地表超载会使隧道产生纵向不均匀沉降,危害隧道运营安全,隧道的沉监测降数据对于分析隧道的安全状态具有重要意义。提出了基于永久散射体合成孔径雷达干涉测量技术(PS-InSAR)的地表超载下隧道沉降预测方法,并在上海杨高中路电力隧道工程进行了应用,结果表明,PS-InSAR技术可以获取高精度的地面沉降数据,与水准数据相比,平均误差为0.78 mm/y;采用本方法预测得到的隧道沉降速率曲线与水准实测曲线变化趋势相对一致,较为准确的识别出了隧道纵向不均匀沉降发生的位置,预测沉降速率与隧道实测速率相比,平均误差为3.09 mm/y。影响结果精度的因素主要有PS-InSAR地表沉降拟合误差、隧道上方土层沉降计算误差以及隧道邻近施工造成的土体扰动。PS-InSAR具有监测范围广、可获取历史数据的优势,可以为软土地区隧道沉降数据获取与分析提供新思路。The overload on the ground surface causes the longitudinally uneven settlement of tunnels and endangers the safety of tunnel operations.The settlement monitoring data of tunnels plays a significant role in analyzing the safety of the tunnels.A method of tunnel settlement prediction based on Persistent Scatterer Interferometric Synthetic Aperture Radar(PS-InSAR)under ground surface overload is proposed.The method is applied in the Shanghai Yanggaozhong Road power tunnel project.The results show that:PS-InSAR technology can be applied to collect high-accuracy ground settlement data with an average error of 0.78mm/y compared with groundlevel monitoring data.The tunnel settlement rate curve predicted by this method is relatively consistent with the tunnel level measured curve,and the location of the longitudinally uneven settlement of the tunnel is detected accurately.Compared to the measured settlement rate of the tunnel,the average error of predicted settlement rate for the tunnel is 3.09mm/y.The main factors affecting the accuracy of the results include the fitting error of ground surface settlement caused by using PS-InSAR data,the settlement calculation error of soil layers above the tunnel,and the soil disturbance caused by the construction activities in the vicinity of the tunnel.PS-InSAR shows such advantages as the wide range of monitoring and the access to historical data,which contributes new ideas to the acquisition and analysis of tunnel settlement data in soft soil areas.

关 键 词：隧道 不均匀沉降 PS-InSAR技术 克里金插值 水准监测 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]