黄河口埕岛海域土性特征的统计分析

STATISTICAL ANALYSIS OF SOIL PROPERTY AT CHENGDAO SEA AREA IN ESTUARY OF YELLOW RIVER

通过搜集汇总埕岛海域地质勘察资料,绘制表层土体的平面分布,分析该区粉质黏土、粉土和淤泥质土的土性均值、变异系数和互相关系数,结果发现,埕岛海域沉积的土体主要以粉土和粉质黏土为主;该区土体重度、含水量、孔隙比和液塑限变异系数均较小,压缩性参数变异系数相对较大;根据文中的回归公式,可由含水量求出孔隙比、重度和压缩参数。最后基于Vanmarcke土层随机场模型,采用空间递推法计算土性在竖向上的非均匀程度,竖向相关距离位于0.49～0.93m之间,且与水深无相关性。

Some geotechnical surveying data in Chengdao sea area were collected, summarized and ana- lyzed. By drawing surface soil distribution figure, calculating the mean value, variation coefficient, and correlation coefficient of silty clay, silt and mud, some conclusions were got. sediments deposition of Chengdao sea area are mainly composed of silt and silty clay; the variation coefficients of gravity, water content, void ratio, liquid limit and plastic limit are little, however, the coefficients of compression param- eters are relatively large; the soil void ratio, gravity and compression parameters can be calculated by wa- ter content according to the forum fitted in this article. Finally, the non-uniformity of soil property was calculated by spatial recursive method based on the Vanmarcke Random Field Model. The vertical relation distances lie in 0. 49-0. 93 m, close to those on land in China.