Unraveling subtle details of expendable bottom penetrometer (XBP) deceleration profiles
Unraveling subtle details of expendable bottom penetrometer (XBP) deceleration profiles
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揭开一次性底部贯入仪 (XBP) 减速曲线的微妙细节
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
T. Wever
中科院分区：
文献类型：
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作者：
N. Stark;T. Wever
一次性海底硬度计（XBP）是一种可由单人部署的自由下落探头，通常用于快速将海底沉积物强度划分为硬、中或软。对软沉积物（最大减速度小于20克）的减速度-深度剖面的评估表明，对这一类别进行更细的细分是可能的。因此，在2003年和2006年在波罗的海西部的四个研究区域的R/V Planet上的两次巡航期间记录了XBP数据集。可以根据梯度和曲线进展来区分轮廓。将这些数据与研究航行期间在同一地点取得的重力岩心的描述进行比较，揭示了波罗的海西部泥的典型剖面，以及含有砾石、植物碎片、砂层或粉砂层和贝壳碎片等局部不均匀性的沉积物的独特剖面。减速和沉积物岩心资料之间的这种良好一致性意味着，XBP一旦校准，就可用于研究或工程目的，对海底沉积物进行快速和适当精确的定性。值得注意的是，现有的模型来预测岩土性能，如抗剪强度和承载力仍然表现出的缺点，涉及过于广泛的假设或估计的基础上的承载力系数或应变率乘数。
The expendable bottom penetrometer (XBP), a free-falling probe which can be deployed by a single person, is commonly used to rapidly classify seafloor sediment strength as hard, medium or soft. Assessments of deceleration-depth profiles of soft sediments (maximum deceleration smaller than 20 g) suggest that a finer subdivision of this class is possible. Thus, XBP datasets were recorded during two cruises aboard the R/V Planet in 2003 and 2006 in four study areas in the western Baltic Sea. The profiles can be distinguished in terms of gradient and curve progression. Comparing these data with descriptions of gravity cores taken at the same localities during the research cruises reveals a typical profile for western Baltic Sea mud, and distinct profiles for sediments containing localized inhomogeneities such as gravel, plant fragments, layers of sand or silt, and shell fragments. This good agreement between deceleration and sediment core information means that, once calibrated, XBPs can be used for a quick and suitably precise characterization of seabed sediments for research or engineering purposes. Notably, existing models to predict geotechnical properties such as shear strength and bearing capacity still show the disadvantage of involving excessively broad assumptions or estimates based on the bearing capacity factor or strain rate multiplier.