【摘要】 作为一种缓变的地质灾害,地面沉降会对建筑物的安全状况产生严重影响。尤其是地铁施工给周边目标引入的沉降风险,已经成为政府管理部门和社会热点关注问题之一。星载合成孔径雷达干涉测量(interferometric synthetic aperture Radar,In SAR)技术能全天时、全天候、大范围获取地表高精度形变信息,为受地面沉降影响后城市建筑物的风险评估提供技术支持。以深圳市某地铁站周边建筑群为研究对象,利用PSP-In SAR技术,获取了深圳市2013年9月—2016年9月的形变数据。在数据分析的过程中,首先结合地铁站施工方案、地质资料和建筑物自身属性,对不同时间段建筑物的形变趋势变化及其对建筑物的影响开展了相应研究;然后,选取研究区域内某栋建筑物为研究对象,分析了不同部位PS点的差异形变和倾斜量,并结合相应标准,初步评估了该栋建筑物受沉降灾害影响的风险;最后,通过与水准数据对比,验证了In SAR形变测量结果的精度。实地调研也在形变量较大的建筑物上发现了相应危险征兆。实际案例分析证实了In SAR技术有能力在未来城市建筑物风险评估及综合治理的过程中起到重要作用。更多还原

【Abstract】 As a slow onset geological hazard,ground subsidence could damage buildings. In particular,the settlement risk induced by subway construction on building structures has become a matter of concern to governmental authorities and the public. Spaceborne interferometric synthetic aperture Radar( In SAR) technology could acquire high-precision surface deformation information and provide technical support to evaluate the risk level of urban buildings caused by ground subsidence hazards. Based on the deformation data acquired from September 2013 to September 2016 by PSP-InSAR algorithm,the authors selected the buildings near a subway station in Shenzhen as the study object. In data analysis process,first of all,combined with the construction scheme of subway station,geological information and the property of the building,the authors carried out the corresponding research on the change of the deformation trend in different periods and the risk assessment of the settlement disaster. Then,one building in the study area was selected as the research object,and the differential deformation and inclination were analyzed based on the deformation of PS at different locations. Combined with the corresponding standards, the risk of building subsidence disaster was preliminarily evaluated. Finally, by comparing with the leveling data,the precision of the InSAR measurement results was discussed. In accordance with the field investigation,it is verified that the corresponding risk symptoms have been found on the buildings whose deformation values were identified as relatively high in the analysis process. The comparison between data analysis and field investigation results confirms that InSAR technology is capable of playing an important role in urban building risk management process in the future and the methodology can be widely applied beyond the case study area.更多还原