莱州湾西岸沉积环境及土的工程地质特性

The sedimentary environments and geotechnical properties of seabed soil in the western Laizhou Bay

利用莱州湾西岸三个钻孔的工程地质资料，分析了其浅部地层的沉积环境及其工程地质特性，并对研究区表层粉土液化特性进行了评价。研究显示，莱州湾西岸海域受黄河泥沙的影响，上部为现代黄河三角洲侧缘沉积。该层多为软塑到流塑状态，含水率高、压缩性高、强度小、承压性低，工程性质较差。中间为一套浅海相沉积层，为粉土与粉质粘土互层，工程性质优于上部。底部为一套陆相沉积，砂粒含量增大，抗剪强度较高。经粉土液化分析，浅水区内表层粉土在烈度为8度和9度时可能发生液化。

According to three engineering geotechnical boreholes, the sedimentary environments and geotechnical features of the shallow strata in the western Laizhou Bay has been studied. The modem sedimentary environment of western Laizhou Bay is dominated by the Yellow River. The upper part is the modem Yellow River deltafic sedimentation, which the top floor is silt, underlied with silt and silty clay interbedded strata. This part has bed engineering geological characteristics with high water content, high compressibility, low shear strength and soft plastic-flow plastic. At the middle of shallow stratigraphy the engineering geological characteristics of marine facies that silt and silty clay interbedded strata is better than upper＇s. The land facies at the bottom has the best engineering geological characters that ,the content of sand increased obviously. The silty soil in study area is prone to liquefaction according to liquefaction analysis.