基于SBAS-InSAR的延安新区地表沉降监测与分析

Surface subsidence monitoring and analysis in Yan’an New District based on SBAS-InSAR

以延安新区为研究区,采用SBAS-InSAR方法对2015年建成之后的地面沉降进行监测分析,结果表明, 2015-2019年延安新区雷达视线方向形变速率为-52~13 mm/a,垂直向形变速率为-74~18 mm/a.通过克里金插值发现延安新区有2个明显的西北-东南向的带状沉降区域,最大的沉降区域从南至北贯穿新区;新区东侧有两块抬升区域,抬升量较小.沉降主要发生在填方区,抬升发生在挖方区,填方区沉降速率呈现慢-快-慢的形变规律.经野外现场验证,该形变监测结果与实际情况吻合.

The Yan’an New District was taken as the study area, the SBAS-InSAR method was used to monitor and analyze the land subsidence after its construction in 2015 and the following results obtained:from 2015 to 2019, the deformation rate in the line of sight direction of Yan’an New District was-52-13 mm/a, vertical deformation rate-74-18 mm/a. Through the Kriking interpolation, it was found that there were two obvious northwest to southeast banded subsidence areas in the district, and the largest subsidence area ran through it from south to north. In the east of the new area, there were two patches with a small amount of uplift. The subsidence mainly occurred in the filling area, while the subsidence rate of the fill area manifested a slow-fast-slow deformation law. Field tests showed that the deformation monitoring results were in good agreement with the actual situation.