Voxel modeling of geotechnical characteristics in an urban area by natural neighbor interpolation using a large number of borehole logs
Voxel modeling of geotechnical characteristics in an urban area by natural neighbor interpolation using a large number of borehole logs
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DOI：
10.1007/s12145-021-00600-x
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发表时间：
2021-03
影响因子：
2.8
通讯作者：
S. Nonogaki;S. Masumoto;Tatsuya Nemoto;T. Nakazawa
中科院分区：
文献类型：
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作者：
S. Nonogaki;S. Masumoto;Tatsuya Nemoto;T. Nakazawa
钻孔记录是了解地下地质和岩土条件的重要地理空间数据。近日，许多城区钻孔日志以机器可读文件格式在互联网上向公众开放。然而，一些简单的方法允许我们构建具有高度客观性的地质和岩土特征的体素模型过程。我们的工作旨在开发一种简单的方法，便于在城市地区的地质和岩土调查中使用露天钻孔测井。在本文中，我们提出了一种利用机器可读的裸眼测井记录进行岩土数据体素建模的方法。该方法是通过以规则的高程间隔存储在钻孔记录中的岩土数据叠加一系列自然邻域内插法产生的水平二维网格数据来构建岩相和标准贯入测试结果的体素模型。利用日本东京都地区的大量钻孔测井资料对该方法进行了测试计算。结果表明，该方法不仅保证了建模过程的客观性，而且在不设置复杂计算参数的情况下，较好地反映了地下岩土特性的三维分布规律。总之，提出的方法提高了地质分析的效率，如利用钻孔测井进行地层对比，并促进了城市地区裸眼井测井的使用。
Borehole logs are important geospatial data for understanding subsurface geological and geotechnical conditions. Recently, many borehole logs in urban areas have been open to the public on the Internet in machine-readable file format. However, a few simple methods allow us to construct a voxel model of geological and geotechnical characteristics with high objectivity of the modeling process. Our work aims to develop a simple method that facilitates the use of open borehole logs in geological and geotechnical investigations in urban areas. In this paper, we propose a voxel modeling method of geotechnical data using the machine-readable open borehole logs. The method is designed to construct voxel models of lithofacies and standard penetration test results by stacking a series of horizontal two-dimensional grid data that are created by natural neighbor interpolation using geotechnical data stored in borehole logs at regular elevation intervals. A test calculation to evaluate the proposed method was performed using a large number of borehole logs in the Tokyo metropolitan area, Japan. Results confirmed that the proposed method not only allows us to ensure the objectivity of the modeling process but also provides a good overview of the three-dimensional distribution pattern of the subsurface geotechnical characteristics without any setting of complicated calculation parameters. In conclusion, the proposed method improves the efficiency of geological analyses, such as stratigraphic correlation using borehole logs, and facilitates the use of open borehole logs in urban areas.