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我国沿海大多为淤泥质海岸,由于土的组成及沉积条件的不同,虽同属淤泥质土,但各地土层的特性有很大的差异。由于上海、天津等大城市的建设有较大的发展,人们对这些地区的地基积累了较丰富的经验,在遇到淤泥质土层时,往往只注意借鉴这些经验,而没有注意到这些大城市土层的塑性较低(塑性指数大多为20左右)、并夹有大量的薄砂层等特点,以及由此而产生的对固结及强度特性的影响。当把这些经验应用到另一些地区,如连云港、宁波、湛江等地的地基问题时,则会遇到很多困难。连云港、宁波、湛江等处的地层为塑性灵敏粘土,与沿海其他地方相比,其粘粒含量较高,塑性指
Most of the coastal areas in China are silty coasts. Due to the differences in soil composition and sedimentary conditions, although they all belong to muddy soils, the characteristics of the soil layers are very different. Due to the great development in the construction of major cities such as Shanghai and Tianjin, people have accumulated rich experience in the foundations of these areas. When encountering muddy soil layers, they often only pay attention to these experiences, but they do not notice these large The plasticity of the urban soil layer is low (the plasticity index is mostly about 20), and a large number of thin sand layers are sandwiched, and the resulting effect on the consolidation and strength properties. When these experiences are applied to other areas, such as the foundation problems of Lianyungang, Ningbo, Zhanjiang, etc., many difficulties will be encountered. The formations in Lianyungang, Ningbo, Zhanjiang, etc. are plastic-sensitive clays. Compared with other places along the coast, they have higher clay content and plasticity.