现代黄河三角洲粉质类土承载力确定

现代黄河三角洲粉质类土,是指1855年黄河改道以来注入渤海快速堆积的细粒沉积物,目前覆盖面积约5000 km2,主要分布于山东省东营市胜利油田所在地。选定4个研究场区地基土,进行现场系列原位土工试验,即平板载荷试验、螺旋板载荷试验、扁铲侧胀试验、标准贯入试验、静力触探试验;结合室内土工试验,分析研究黄河口新近快速堆积的细粒沉积物承载力特征值;系统比较各种试验手段确定的承载力特征值差异;以载荷试验确定的承载力特征值为标准,建立比贯入阻力Ps、标准贯入击数N、含水量w和孔隙比e与承载力特征值fk间的回归方程,为现代黄河三角洲地区粉质类土地基承载力特征值确定提供科学依据。

DETERMINATION OF SLITY SOIL BEARING CAPACITY ON MODERN YELLOW RIVER DELTA IN CHINA

The slity soil on the modern Yellow River Delta is the fine sediment which has been rapidly accumulated since the Yellow River divagated into Bohai Sea in 1855.The coverage area is about 5 000 km2.It almost covers Shengli Oil Field in Dongying City,Shandong Province.Four groups of site contrast tests are chosen to conduct the systematic site soil tests including the plate load test,spire plate load test,flat dilatometer test,standard penetration test and static cone penetration test.The characteristic values of the bearing capacity of the fine sediment that has been rapidly accumulated recently in entrance of Yellow River are studied according to the analysis of the site test and the laboratory test.The difference between the characteristic values of the bearing capacities that are confirmed by different methods is systematically contrasted.Moreover,the regression equations between specific penetration resistance Ps,blow counts of standard penetration test N,water content w and porosity ration e and the characteristic value of bearing capacity fk are built according to the bearing capacity that is confirmed by the plate load test.The research can provide scientific references to determine the characteristic value of the bearing capacity of the slity soil on the modern Yellow River Delta.