Keita NAKAMURA
Studies on digital geotechnical engineering map and the application of disaster prevention in Chuetsu area.
Satoru OHTSUKA
Digital geotechnical engineering map, ground information database is a collection of "raw data" information not only cooperation, in addition to the interpretation of geological and geotechnical engineering, is intended to ground information leverageĦĦby providing. Digital geotechnical engineering map, in each region in each section 250m, shallower than 100m ground information typical modeled on the basis of uniform national system is electronically created. The information contained therein can be viewed via the Internet download.
This study was made to create a digital geotechnical engineering map in NAGAOKA city, KASHIWAZAKI city, and JOETSU city. I considered statistical analysis available on the effect of average N value and the house damage of Chuetsu Earthquake. Also I considered effect on antecedent precipitation sediment related disaster by using soilĦĦrainfall index.
In creating digital geotechnical engineering map was able to grasp the Geotechnical characteristics and deposition circumstances of each region.
In the statistical analysis available on the effect of the average N value and houses damage by Chuetsu earthquake, land condition divided into four groups. From house damage analysis of Chuetsu Earthquake, House damage rate revealed that correlation with average N value and the land conditions.
In the statistical analysis available on the effect of sediment related disaster by antecedent precipitation, in the floodĦĦof 13 July 2004, soil rainfall index showed a very high value of about 140. Found that risk of is very high because is within the Reference value range of sediment related disaster warning in NAGAOKA at the time soil rainfall index of 13 July 2004. Rain of 13 July 2004 was able to confirmed very heavy rain in a short period of time from the soil rainfall index.
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