【摘要】 采用弯曲元剪切波测试方法对在南黄海中部采集到的沉积物样品进行了剪切波速度测试,基于所获得的剪切波速度数据,分析了研究区沉积物剪切波速度特性及分布规律。分析表明,沉积物剪切波速度为12.05~74.55m/s,总体相对较低。浅表层沉积物剪切波速度呈现出分区域分布特征,可分为东北部低速区、西南部高速区、北西-南东向梯度带以及测区东南部的低速背景上的串珠状高速异常区四个区域。通过回归分析,建立了剪切波速度与密度、含水率、孔隙比、孔隙度、液限、塑限、压缩系数、抗剪强度等沉积物物理力学参数之间相互关系的经验回归公式。回归分析结果表明,海底沉积物剪切波速度与上述物理力学参数之间均具有较好的相关性,相关系数R均大于0.80。更多还原

【Abstract】 The shear wave speeds of core samples collected from the middle of the Southern Yellow Sea are measured using bender elements method,and then the properties of shear wave speeds and its spatial distribution are analyzed based on the measured data of shear wave speeds.It is demonstrated that the shear wave speeds of the study area are relatively low,ranging form 12.05m/s to 74.55m/s.The zonal distribution of shear wave speeds are divided into four sub-zones:low speed sub-zone in the northeast;high speed sub-zone in the southwest;speed gradient band aligning from northwest to southeast;and highspeed beaded anomaly in the low speed background in the southeast.The empirical equations with good coefficients(R>0.80)between shear wave speeds and physical-mechanical parameters,such as density,percent moisture,porosity ratio,percent porosity,liquid limit,plastic limit,compression coefficient,shear strength of seafloor sediments,were built up by means of regression analysis.更多还原