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Furuya, Kazuo*; Kodama, Toshio*; Yoshida, Naoto*
JNC TJ7420 2005-044, 341 Pages, 2002/03
JNC-TJ7420-2005-044.pdf:195.83MB
This report presents the result of two-dimensional stress and seepage flow coupling analysis of groundwater environment around Nojima Fault after Hyogoken-Nanbu earthquake.
Furuya, Kazuo*; Kodama, Toshio*
JNC TJ7420 2005-039, 260 Pages, 1999/03
JNC-TJ7420-2005-039.pdf:16.01MB
This report presents the result of literature study of hydrological data on fault and related data, and two-dimensional saturated-unsaturated seepage flow analysis of groundwater behavior around Nojima fault in northwestern part of the Awaji Island after the Hyogoken-Nanbu earthquake in order to study the change of groundwater environment by activity of fault.
Furuya, Kazuo*; *; Kodama, Toshio*
PNC TJ7705 97-001, 154 Pages, 1997/03
no abstracts in English
Nakano, Katsushi; Seo, Toshihiro; ; ; Ogata, Nobuhisa; Wakamatsu, Hisanori; Yanagizawa, Koichi
PNC TN7510 92-007, 27 Pages, 1992/07
None
Yanagizawa, Koichi; Imai, Hisashi; ; Wakamatsu, Hisanori; Umeda, Koji
PNC TN7410 92-019, 68 Pages, 1992/07
Groundwater flow was analysed in the two areas of different scale situated in central Japan, in order to estimate hydrological condition existing at the deep underground in Japan. For the analysis in the Central Japan area (300 
500km 10km deep), a hydrogeological model (a model expressing distribution of hydraulic conductivity) was built up with data from literature published so far. The model in the Tono area (8 7km 3km deep) which is a part of the Central Japan area, a hydrogeological model was built up with field data from the area studied. Based on these models, steady state three-dimensional groundwater flow under a saturated-unsaturated condition was calculated by means of FEM. The results are as follows: (1)In the Central Japan area, distribution of piezometric head harmonizes with topography in the area. (2)In the Tono area, distribution of piezometric head in the sub-surface part is governed by local topography, while that in the deeper part is governed by underlying regional topography. (3)In both areas, vertical variation of piezometric head is rather small without the shallow part, which indicates hydrostatic distribution. (4)Hydraulic gradient is less than 0.04 in the most part below GL-500m in both areas. (5)The results of the analysis in the Central Japan area show that types of distribution of hydraulic conductivity below EL-3,000m, of relationship between saturation ratio and pressure head, and of lateral boundary condition, do not remarkably affect the flow situation.
Yanagizawa, Koichi; ; Osawa, Hideaki; Wakamatsu, Hisanori; Umeda, Koji
PNC TN7410 92-015, 67 Pages, 1992/06
This report deals with the permeability of rock mass from the ground surface to 1,000 m deep in Japan. The purpose of this study is to obtain the fundamental data in order to analyse groundwater behavior. 552 data of permeability are collected from 18 kinds of technical papers. These data, which are mostly obtained by in-situ test, are analysed from the viewpoint of rock types (granitic rocks, gabbroic rocks, rhyolitic rocks, basaltic rocks, Neogene sedimentary rocks, Pre-Neogene sedimentary rocks, limestone, metamorphic rocks, Quaternary sediments, Quaternary volcanic rocks), depth and location. From this study, it is found that the permeability of rock mass in Japan are in the order of 10
cm/sec to 10
cm/sec. The mean hydraulic conductivity is on the order of 10
cm/sec in limestone, 10
cm/sec in Quaternary deposite, and 10
cm/sec in the other kind of rocks. Hereafter wider collection of data and analyses are recommended for the comprehensive evaluation of rock permeability in Japan.