上海区域地面沉降模型中土层变形特征研究

Study on the deformation characteristics of soil layers in regional land subsidence model of Shanghai

根据上海大量地面沉降和水位观测资料,结合室内实验,首次系统分析了上海过量开采地下水引起地面沉降过程中各土层的变形特征及地面沉降在空间、时间上的分布规律,发现上海各土层变形特征差异很大,同一土层在不同地点不同时期变形特征差异也很大。地面沉降受多种因素影响呈现出空间分布的复杂性,土层压缩量的垂向分布,从20世纪90年代之前以浅部土层压缩为主转变为90年代之后以深部和浅部土层压缩为主。这些研究成果将为上海区域地面沉降模型中各土层沉降模型的合理选择提供依据。

A large number of observation data of land subsidence and underground water level and some results of laboratory soil test are used to analyze the deformation characteristics of soil layers in Shanghai. It's the first time to comprehensively analyze the deformation characteristics of all soil layers and the spatial and time distribution of land subsidence caused by excessive pumping of groundwater. It is found that the deformation characteristics of soil layers are rather different from each other, and the deformation characteristic of some soil layer is different at different time and in different place. Land subsidence is influenced by many factors, so that its spatial distribution is complex. The subsidence mainly occurred in shallow soil layers before nineties of the last century, but mainly occurred in deep and shallow soil layers since nineties of the last century. The subsidence model of every soil layer can be properly developed according to these results.