STUDY OF SHANDONG HOLOCENE LITTORAL SOFT SOIL AND ITS ENGINEERING GEOLOGICAL HAZARD
Wu Jianzheng (Institute of Marine Geology,MGMR,Qingdao,266071,China)
Shandong Holocene littoral soft soil is distributed in bays, lagoons and river estuaries and has a thickness of 1-10m. Bay and lagoon soft soil is mud or muddy soil. In shallow water area with rich terrigenous supply,the soft soil grains are relatively coarse and intensity relatively high,but its thixotropy can do great harm to constructions. In deep water area with little terrigenous supply,the soft soil grains are finer and with lower intensity and high compression, and the great subsidence deformation and creep property are main damaging factors to construction stability. Bay and lagoon soft soil is below groundwater level,with low permeability,and when buried,it is difficult to have water drain out. Underlying the soft soil is alluvium with relatively high intensity, which is suitable to small construction after foundation treatment. The Yellow River delta is made up of silt and soft soil. Both of them can do harm to engineering. Littoral soft soil can be correctly evaluated by means of in-situ static sounding and vane test. And this is the basis of prevention of engineering geological hazards caused by soft foundation.
【CateGory Index】： P642.133