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Density and undrained shear strength of bed sediment from ND-CPT

机译：ND-CPT床层沉积物的密度和不排水剪切强度

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Abstract The density and the undrained shear strength (s_u) of bed sediments at either side of the Isahaya Bay dike in the Ariake Sea, Japan, were investigated using nuclear density cone penetration tests (ND-CPTs). The nuclear density cone penetrometer (ND-CP) was operated from a boat, conducting 71 ND-CPTs. Furthermore, 26 undisturbed samples were obtained for soil density and s_u measurements to calibrate the ND-CPT data. The results show that the density and s_u obtained from in situ with the ND-CPTs agree well with those from the laboratory tests on undisturbed samples, and the obtained density profiles show good repeatability. The vertical variation in density and s_u of the bed sediment can be obtained from the ND-CPT results. The relations between the density and s_u show that s_u increases with an increase in density, but that this relation is site specific. The values of s_u show an exponentially growing trend and the values of log s_u show a linearly increasing trend with density. The vertical distribution of the bed sediments can be described using the density values obtained with the ND-CPT.
机译：摘要利用核密度锥渗透试验（ND-CPTs）研究了日本有明海Isahaya Bay堤防两侧的层状沉积物的密度和不排水剪切强度（s_u）。核密度锥形渗透仪（ND-CP）从船上操作，进行71枚ND-CPT。此外，获得了26个未扰动样品的土壤密度和s_u测量值，以校准ND-CPT数据。结果表明，使用ND-CPT原位获得的密度和s_u与未受干扰样品的实验室测试的密度和s_u吻合良好，并且所获得的密度分布显示出良好的可重复性。床沉积物的密度和s_u的垂直变化可以从ND-CPT结果获得。密度与s_u之间的关系表明s_u随着密度的增加而增加，但是这种关系是特定于位置的。 s_u的值显示出指数增长的趋势，log s_u的值显示随密度线性增长的趋势。可以使用ND-CPT获得的密度值描述床沉积物的垂直分布。

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