THE STUDY FOR ENGINEERING GEOLOGICAL FEATURES AND GENET-IC TYPES OF SOFT-SOIL IN THE LOWER REACHES OF THE YANGTZERIVER

In order to save cultivated land resources and reduce efficiently the cost of project construction,the sub-grade or borrow pits are placed in low-lying places such as reservoirs and ponds,and soft-soil is used to be road-bed filling materials. With high porosity ratio,high compressibility,high water content and low strength,natural soft soil can not meet needs of projects. If soft soil would not be handled properly,geotechnical engineering prob-lems or engineering accidents would occurred in projects construction. Because of different genesis,the engineering geological properties of soft soils are obviously different. This paper discusses the engineering geological properties and the genetic types of soft soils based on their mineral compositions.