Abstract
Scaling methods are applied to the categorized soil names in drilling-logs for numerically evaluate the ground condition in depth direction. The numerically converted categories are amiable to the succeeding mathematical operations.
The present report outlines the reseach on scaling of soil categories, then shows the application of scale for the cluster analysis of drilling-logs and the constraction of zoning map based on the geodetic coordinates of drilling-logs and their cluster.
We analized 149 drilling-logs in the eastern area of Muroran city, Hokkaido, Japan. Soil names in drilling-logs are summarized into following 13 successive categories: surface soil<highly organic soil<volcanic cohesive soil<organic soil<cohesive soil<silt<sandy soil<sand<gravelly soil<gravel<tuffaceous rock (the Quaternary system) <tuffaceous rock (the Tertiary system) <rock block (except tuffaceous rock) .
Scaling methods are applied to the successive categories. Twenty-two sets of scale values are ex-amined for the categories. The summary of the results are shown below.
1) There is little reason to choose anyone among equal appearing intervals, intentional scales, theoretic scales and semitheoretic scales.
2) The scale evaluation of drilling-log with the equal appearing intervals or the intentional scale have strong correlation with the ones of the theoretical or the semitheoretical scale in statistics.
3) In this study, the intentional scale of 1, 2, 3, …, 10, 11, 16, 17 is adopted for the categories, which is the most amiable scale for interpolation of category and cluster analysis of dilling-logs.
4) The representative drilling-log of each cluster are selected easily. The representative drilling-logs of each cluster gives us concrete image of the soil system of the zoning area.
