1 工程地质概况上海地区为长江三角洲滨海相沉积,属第四系沉积层.沉积层厚度大,团结度低,土体软弱,地下水位距地面约1m左右.地铁长沙路和思南路泵站所处地层为灰色淤泥质粘土层,易压缩,强度低,含水量高达48%左右,属高灵敏度土,土体结构被破坏后;强度会骤然降低,次固结量可达主固结量的2～3倍.具有明显的流变特性. 1 Engineering Geology Survey Shanghai is a sedimentary facies of Quaternary sediments in the coastal area of ​​the Yangtze River Delta, with thick sediments, low unity and weak soil mass, and the groundwater table is about 1m above the ground.The subway stations of Changsha and Sinanlu Department of the gray muddy clay layer, easy compression, low strength, water content up to 48%, is a high sensitivity soil, soil structure is destroyed; the intensity will suddenly decrease, the secondary consolidation up to the main consolidation capacity 2 to 3 times with obvious rheological properties.