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一、前言本报告在研究上海市区浅层土固结特性的基础上(见1975年至今的工作报告,采用一种考虑了次固结的沉降计算方法. 这一方法的理论及实验依据主要有以下几方面: (一)浅层土的下沉问题可以作为:“低应力状态下,饱和粘性土的维固结问题”来研究.因为上海地区由抽水造成的沉降面积极为广大(宽达20公里),而浅层土的厚度(包括第一、二压缩层共计30米左右)相对很小.并且,上层在水平方向的分布比较均匀,因此
I. INTRODUCTION This report is based on a study of the consolidation characteristics of shallow soils in the Shanghai area (see the work report for the period from 1975 to the present, and adopts a settlement calculation method that considers secondary consolidation. The theoretical and experimental basis for this method is mainly There are the following aspects: (a) The problem of subsidence of shallow soils can be studied as: “Consolidation of saturated clays in low-stress conditions” to study. Since the settlement surface caused by pumping water in Shanghai is active for the majority (wide 20 km), while the thickness of shallow soil (including the first and second compression layers is about 30 meters in total) is relatively small, and the distribution of the upper layer in the horizontal direction is relatively uniform, so