广州市南沙区软土地面沉降特征及防治对策研究

Study on land subsidence characteristics and prevention countermeasures of soft soil in Nansha District,Guangzhou City

通过收集前人资料并结合野外地面沉降情况调查,分析广州市南沙区软土层特征及地面沉降规律,并提出防治对策。研究表明:南沙区软土为全新世沉积的滨海相软弱黏性土,软土厚度一般10~35 m,少数区域大于35 m;南沙区软土主要成分为石英、云母、黏土矿物和有机质;南沙区软土地面沉降十分发育,其空间分布与软土的分布范围基本吻合,为典型的软土地面沉降破坏形式。从科学合理编制城市规划、系统分类进行工程防治、建立监测预警体系三方面提出了防治对策。

By collection of previous data and field investigations of land subsidence,this study analyzed the characteristics of soft soil layer and the land subsidence rule in Nansha District of Guangzhou City,and proposed prevention and control measures.The results show that the soft soil in Nansha District is a coastal soft clay deposited during the Holocene period,with a thickness generally ranging from 10 to 35 m,and in some areas exceeding 35 m.The soft soil in Nansha District mainly consists of quartz,mica,clay minerals,and organic matter.The soft land subsidence in Nansha District is highly developed,with its spatial distribution is closely matching the distribution range of the soft soil,representing a typical form of soft land subsidence failure.The proposed prevention and control measures encompass three aspects:the scientific and rational preparation of urban planning,systematic classification of engineering prevention and control,and the establishment of a monitoring and early warning system.