基于SBAS-InSAR的串新高速建设前后沉降监测与分析

Monitoring and Analysis of Subsidence before and after Construction of Chuanxin Expressway Based on SBAS-InSAR

摘要: 针对我国西南山区高速公路容易受到滑坡地质灾害影响、难以进行大范围监测的问题，本文选取位于云南省绥江县的串新高速公路作为研究对象。首先以串新高速沿线3 km范围作为缓冲区，利用SBAS-InSAR技术获取缓冲区2015年1月~2022年12月的沉降信息；然后分析缓冲区内串新高速在修建过程中及通车后的沉降趋势，探究各沉降区域形成的原因。研究表明：① 缓冲区内存在5个典型沉降区域，均发生过不同程度的滑坡；② 其中3个沉降区域的形成原因主要与串新高速施工有关；③ 串新高速公路主干道穿过5个典型区域中的2个区域，且其中一个区域在2022年的年均沉降速率超过−50 mm/a，发生滑坡地质灾害概率较大，应及时做好防护。

Abstract: In response to the problem of landslide geological disasters and the difficulty in conducting large-scale monitoring of expressway in the mountainous regions of southwestern China, this study focuses on the Chuanxin Expressway in Suijiang County, Yunnan Province. Firstly, a 3 km buffer zone along the Chuanxin Expressway was selected, and the SBAS-InSAR technique was employed to obtain subsidence information from January 2015 to December 2022. Subsequently, the subsidence trends of the Chuanxin Expressway within the buffer zone, both during construction and after its opening, were analyzed to explore the causes of subsidence in different areas. The study reveals the following findings: ① There are five typical subsidence areas within the buffer zone, all of which have experienced varying degrees of landslides. ② The formation of three of these subsidence areas is mainly related to the construction of the Chuanxin Expressway. ③ The main road of the Chuanxin Expressway passes through two of the five typical areas, one of which exhibited an average subsidence rate exceeding −50 mm/a in 2022, indicating a high risk of geological landslides. Protective measures should be promptly implemented in this area.