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1 软土地基沉降变形特性1.1 上海软土地基类型上海是典型的软土地区。根据土层特性及住宅工程实践经验,上海软土地区可分为3种地基类型:1.1.1 为上海地区正常地层,简称Ⅰ区。1.1.2 为浅层砂分布地层,简称Ⅱ区。该区在浅层藏有②_3层砂质粉土、粉砂,有一定厚度(6～15m),有利于地基土附加应力的扩散,且排水固结条件好,能有效地控制基础沉降,但有土质不均匀、土性变异等特性。1.1.3 为最软弱地层,简称Ⅲ区。由于各个地区软弱下卧
1 Soft soil foundation settlement and deformation characteristics 1.1 Shanghai soft soil foundation type Shanghai is a typical soft soil area. According to the characteristics of soil and residential engineering experience, Shanghai soft soil can be divided into three types of foundation: 1.1.1 for the normal strata in Shanghai, referred to as Ⅰ area. 1.1.2 shallow sand distribution strata, referred to as Ⅱ area. In the shallow layer, there are sand silt and silt in ②_3 layer, with a certain thickness (6 ~ 15m), which is conducive to the diffusion of additional stress in the foundation soil. The drainage and consolidation conditions are good, which can effectively control the foundation settlement. However, There is uneven soil, variability and other characteristics of soil. 1.1.3 is the weakest layer, referred to as Ⅲ area. Due to various areas under the weak lying