广州南沙区地面沉降分布特征及成因

Distribution characteristics and causes of land subsidence in Nansha District,Guangzhou

广州南沙区地面沉降已经影响到城市发展和人民生命财产安全,为了制定科学有效的措施防止地面沉降进一步发展,文中基于InSAR监测数据和水准监测数据,总结分析了地面沉降分布特征,地表形变多为小范围的、局部地区的剧烈沉降。在此基础上,针对6个沉降严重区域,采用机理模型定量估算了各因素引起的地面沉降量及所占比重,得可压缩土层引起的沉降量为34.43~96.97 mm/a,所占比重在37.07%~75.67%,地下水水位和地面荷载的最大影响比重分别为26.28%和52.40%。并且通过研究分析地面沉降主要因素及影响程度,为科学防治该地区地面沉降提供科学依据。

Land subsidence in Nansha District has affected urban development and the safety of people’s lives and properties.In order to formulate scientific and effective measures to prevent the further development of land subsidence,this paper summarizes and analyzes the distribution characteristics of land subsidence based on InSAR monitoring data and level monitoring data,the surface deformation is mostly severe settlement in a small and local area.On this basis,for 6 areas with subsidence.The mechanism model is used to quantitatively estimate the amount of land subsidence caused by each factor and its proportion.The subsidence caused by the compressible soil layer was 34.43-96.97 mm/a,the proportion is between 37.07%and 75.67%,and the largest influence proportions of groundwater level and ground load are 26.28%and 52.40%.And through research and analysis of the main factors and impact of land subsidence,this paper provide a scientific basis for scientific prevention and control of land subsidence in this area.