前言我国沿海地区和内陆河流谷地分布着大量的软基,其特点是含水量大、压缩性高、透水性差、强度低,尤其上海的地质条件属于典型的软土地基,绝大多数都属于第4纪沉积物,以粘性土、粉性土、砂性土为主。根据以往的工程实例,由于地基基础方面的原因而引起建筑物失事的,占相当大的比例,至于由于地基基础方面的原因而影响到工程发挥正常效益的,则为数更多。所以必须采取各种方法来加固地基,使其达到建筑物所特有的地基要 Foreword A large number of soft bases are distributed in coastal areas and inland rivers of China. They are characterized by large water content, high compressibility, poor water permeability and low strength. In particular, the geological conditions in Shanghai belong to the typical soft soil foundation, and most of them belong to Quaternary sediments to clay, silt soil, sandy soil-based. According to the previous engineering examples, a significant proportion of the buildings were caused by ground-based causes, and there was an even greater number of projects that affected the normal efficiency of the works due to the foundation foundations. So we must take various measures to reinforce the foundation so that it can reach the foundation of the building