上海市第四承压含水层变形特征研究

上海市自1968年调整开采层次以后，第四承压含水层逐渐成为地下水主要开采层次，历史上曾因过度开采利用地下水而成为主要的压缩土层。本文依据上海市长期的地下水位和地面沉降监测资料，总结了第四承压含水层在不同水位变化条件下的变形特征，同时根据压缩试验资料，对第四承压含水层变形机理探讨，为合理开发利用地下水资源提供理论依据。

Study on the Deformation Characteristics of the Fourth Confined Aquifer in Shanghai

Since the water exploitative layer in Shanghai was rearranged in 1968, the fourth confined aquifer has been the main exploitative aquifer and once is the compressed soil layer because of groundwater over exploitation. By summarizing previ-ous monitoring data about groundwater level and land subsidence of Shanghai, the deformation characteristics of the fourth con-fined aquifer are identified. Furthermore, the deformation mechanism of the studied aquifer is studied by analyzing data of compression experiment. All these findings provide theoretical basis for rational exploitation and utilization of groundwater.