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开放科学(资源服务)标志码(OSID):
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修建地铁是缓解城市地面交通压力、提高市民出行质量、彰显城市文化及魅力的重要举措. 地铁大部分位于地面以下,由于施工的原因会对周围土体产生不同程度的影响,可能造成地面塌陷、建筑或构筑物出现不同程度沉降变形,严重的甚至影响地铁施工安全以及地面建筑物或构筑物的使用安全,因此施工中必须对地铁沿线地表沉降进行实时监测.
目前,地铁沿线地表变形监测的主要手段为水准测量和地形测量,但是在大范围的测区中,传统测量方法受到很大限制. 合成孔径干涉雷达测量作为一种新型测量技术,因其精度高、测绘速度快、覆盖范围广等优点在矿山测量、滑坡监测、地表形变测量等方面发挥着至关重要的作用[1-4]. 国内外许多学者利用InSAR技术对地表形变展开监测和研究,如Chen W F等[5]利用28景Radarsat-2数据,基于PS-InSAR技术获取了北京地铁6号线2010年4月至2013年9月期间部分路段的沉降信息,并结合熵值法分析沉降分布的稳定性;范雪婷等[6]利用30景COSMO-Sky Med数据获取了南京市的地表沉降信息,并分析了南京市地铁网络的形变特征;谢文斌等[7]利用17景Sentinel-1数据获取抚顺地区的沉降信息,并结合信息熵对沉降区域的稳定状态进行了评价;刘琦等[8]利用85景Sentinel-1数据,获取了佛山市2015-2018年的地表形变信息,并结合Logistic函数模型预测沉降变化情况. 总体来讲,InSAR技术监测区域多以块状区域监测研究为主,线状区域监测相对较少.
青岛地铁1号线是国内最深且最长的地铁海底隧道,沿线共穿越4组14条断裂带. 受地质条件及施工影响,2019年6月至7月发生2次塌方,造成一定的人员伤亡及财产损失,其他在建地铁线路沿线也屡有沉降现象发生. 青岛地铁工程目前多采用传统方法进行监测,利用InSAR技术对青岛地铁沿线的形变信息监测相对较少. 随着青岛地铁工程的密集建设与发展,对地铁工程沿线地表进行快速、广泛、高效地形变监测极为重要.
本文利用青岛地铁1号线西海岸新区段的29景Sentinel-1A影像数据,采用小基线集技术(SBAS-InSAR)进行处理,获取了2018年5月至2020年5月青岛地铁1号线西海岸新区路段的沉降信息,对沉降重点区域进行了分析.
Monitoring of Land Subsidence of Metro Line 1 in the New District of West Coast of Qingdao Based on SBAS-InSAR
- Received Date: 28/10/2020
- Available Online: 20/02/2022
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Key words:
- Qingdao metro line 1 in the west coast of Qingdao new district /
- land subsidence /
- Sentinel-1A /
- SBAS-InSAR
Abstract: Based on SBAS-InSAR technology, the29 sentinel-1 aimage data of metro line 1 in the new district of west coast of Qingdao was processed, and the information of land subsidence along the section from May 2018 to May 2020 including deformation rate and accumulative land subsidence was obtained. The monitoring results showed that the main subsidence area was located in Anzi station to the north of Anzi east station and nearby region. The maximum ground subsidence velocity reached to about -49 mm/a, and the maximum accumulated settlement was about -103 mm. The ground subsidence velocity in other areas was -5-0 mm/a. The ground subsidence velocity fluctuated greatly in the 0-1 000 m section and the section from Anzi station to Anzi east station. Combined with logistic function model to predict the land subsidence between Anzi east station and Anzi station indicated that the land subsidence will gradually become stable after 2020. The settlement monitoring information can not only provide the data of decision-making basis for making the surface safety plan and reasonable development of underground space in the construction and operation process of nearsubway lines in the new district of West Coast of Qinddao, but also help to improve the related theory.