南京地铁沿线地面沉降监测与危险性评价

Monitoring and risk assessment of land subsidence along Nanjing subway

采用MCTSB-InSAR技术监测南京市主城区地面沉降状况,揭示研究区内地面沉降空间分布特征;通过对地铁线路进行条带空间缓冲区分析和沿线路剖面线分析,进一步研究地铁沿线的地面及周边建筑物不均匀沉降信息;针对主要影响路段进行地质灾害危险性评价,评价结果及特征点时间序列沉降结果与同时期实际情况基本吻合。研究表明,长期进行城市主城区及地铁线路地面沉降监测具有重要意义,同时地质灾害危险性评价工作能为灾害防治及评估提供可靠的支持,具有较大的应用潜力。

The land subsidence of Nanjing main urban area is obtained based on MCTSB-InSAR(multiple master-image coherent target small-baseline interferometric SAR),and the spatial distribution characteristics of land subsidence in the study area are analyzed.By the process of strip spatial buffer analysis and profile line,the uneven subsidence information of the land and surrounding buildings along metro lines are derived.Then,the geological disaster risk assessment is applied on the main impacted road sections.The results of evaluation and time series subsidence of feature point are basically consistent with the actual situation at the same time.The result shows that which is important to long-term monitor the land subsidence of main urban areas and metro lines.It can provide reliable support for disaster prevention and impact evaluation with geological disaster risk assessment and has great application potential.