Abstract In this study, a database is compiled for 11 clay parameters covering 50 sites in Shanghai with 4051 data points (labeled as SH-CLAY/11/4051). These sites are distributed in the eight districts of Shanghai covering an area of 145 km2. This is the first sizeable multivariate soil database compiled at the municipal level. General information, including the geology of Shanghai, the borehole locations and depths, the types of parameters, and the basic statistics associated with these parameters are presented first. The quality of the compiled data is then assessed by comparing them with the data in the published global database CLAY/10/7490 with respect to marginal statistics. Results show that data points in SH-CLAY/11/4051 fall within the range of CLAY/10/7490. It is not surprising that local Shanghai data are more clustered than those in CLAY/10/7490. The range of values spanned by each clay parameter is smaller at a regional/municipal scale than at the global scale. A preliminary study to understand what is “unique” in Shanghai clay data is conducted by comparing global correlations between any two parameters with the corresponding Shanghai versions. Some correlations found in SH-CLAY/11/4051 (e.g., normalized effective vertical stress and normalized undrained shear strength) are observed to be similar to those found in CLAY/10/7490. However, there are other distinct correlations produced by SH-CLAY/11/4051, indicating a regional/municipal effect. This study constructs a multivariate probability distribution based on SH-CLAY/11/4051 to capture these distinct correlations between Shanghai clay parameters. One useful application of this multivariate distribution is act as prior for Bayesian updating.

中文翻译：

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上海粘土性质的多元概率分布

摘要 本研究为覆盖上海50个地点的11个粘土参数编制了一个数据库，有4051个数据点（标记为SH-CLAY/11/4051）。这些站点分布在上海的八个区，占地145平方公里。这是第一个在市级编制的大型多元土壤数据库。首先介绍一般信息，包括上海的地质、钻孔位置和深度、参数类型以及与这些参数相关的基本统计数据。然后通过将它们与已发布的全球数据库 CLAY/10/7490 中关于边际统计数据的数据进行比较来评估汇编数据的质量。结果表明，SH-CLAY/11/4051 中的数据点落在 CLAY/10/7490 的范围内。与 CLAY/10/7490 中的数据相比，上海本地数据更加聚集也就不足为奇了。每个粘土参数跨越的值范围在区域/城市尺度上比在全球尺度上小。通过比较任何两个参数与相应的上海版本之间的全球相关性，进行了初步研究，以了解上海粘土数据中的“独特之处”。在 SH-CLAY/11/4051 中发现的一些相关性（例如，归一化有效垂直应力和归一化不排水剪切强度）被观察到与在 CLAY/10/7490 中发现的相似。然而，SH-CLAY/11/4051 还产生了其他明显的相关性，表明存在区域/市政效应。本研究构建了基于 SH-CLAY/11/4051 的多元概率分布，以捕捉上海粘土参数之间的这些明显相关性。这种多元分布的一个有用应用是作为贝叶斯更新的先验。