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Volume 26 (1989 - 199･･･
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Volume 26, Issue 4
Displaying 1-7 of 7 articles from this issue
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[in Japanese]1990 Volume 26 Issue 4 Pages 1
Published: March 25, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (202K) -
Ryuichi YATABE, Norio YAGI, Meiketsu ENOKI1990 Volume 26 Issue 4 Pages 3-9_1
Published: March 25, 1990
Released on J-STAGE: February 25, 2011
JOURNAL FREE ACCESSIt is difficult to get an undisturbed sample from a slip layer of landslide. It is convenient if shearing characteristics of an undisturbed sample can be estimated from ones of a disturbed sample. Undrained triaxial compression tests were carried out to compare shearing characteristics of both specimens for six kinds of clay. Stress strain and pore water pressure relationships of undisturbed specimen and disturbed specimen were remarkably different. The strength parameters, c' and φ', in terms of effective stress are much the same. The cohesion in terms of effective stress is nearly zero for all clays. Therefore, we can obtain the strength parameters of undisturbed clay at sliding layer from the shear test for the remoulded reconsolidated clay.View full abstractDownload PDF (1043K) -
Hiroyuki YOSHIMATSU1990 Volume 26 Issue 4 Pages 10-15_1
Published: March 25, 1990
Released on J-STAGE: February 25, 2011
JOURNAL FREE ACCESSOn this paper, inverse analysis calculation by the boundary element method is studied. Case studies are made to show that this technique is useful for inverse analysis of confined heterogeneous porous media. A technique by the three-dimensional boundary element method is proposed for inverse analysis for the determination of the optimum location of three-dimensional drainage facilities. The coordinates of the construction site for the three-dimensional drainage facilities are set up as search values and Gauss-Newton method is applied to continue the process of minimization of the objective function that is calculated by the least square method untill the pressure head at the bottom boundary region becomes to the required value. This technique is usefull for the determination of construction location for three-dimensional drainage facilities, which are necessary to determine the required safety factor of the slope.View full abstractDownload PDF (1052K) -
Kiyoharu ISAGAI, Kazuyo ISAGAI, Masuo IWASAKI, Tatuzi TAKAGI1990 Volume 26 Issue 4 Pages 16-28
Published: March 25, 1990
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMany landslides have been carried out in surround area where are located on the north-western of Sasebo city. These are called Hokusho-type and are distributed in similar geological constitutents. But chemical compositions of groundwaters in these landslide areas differ distinctly among those. In present report, the chemical compositions of groundwaters of two landslides areas were investigated. The differences are estimated to depend on movement and materials of landslides. One of type of both landslides is collapse type and another is cohesive type. Colluvial deposits of former landslide area is active chemically weathered and alkalinity of the groundwater is high. The chemical compositions are Ca (HCO3) 2 and MgSO4.
Colluvial deposits of latter landslide area has already weathered. The concentrations of chemical components are low and are the same to those of rain or stream water.
The relationship between the chemical composition of groundwater and the type of landslide was cleared by this study.View full abstractDownload PDF (1737K) -
Masataka TAKAGI, Tadaharu NAKAMURA, Sadaki MIYAUCHI1990 Volume 26 Issue 4 Pages 29-36
Published: March 25, 1990
Released on J-STAGE: July 04, 2011
JOURNAL FREE ACCESSLandslide phenomena are caused by many factors such as of the land, geological features, properties of soil, water balance and others.
We collected many data over more than 20 years, in order to analyzed on mechanism of the landslides called HASAITAI JISUBERI occurred in SHIKOKU ISLAND.
In this paper, we studied statistically on the distribution of gradient of ground surface between the normal area and the landsliding area, and the following conclusions were obtained.
1. Both distribution of gradient of ground surface are different in half of cases, and be same in rate of tenth.
2. Slopes having landsliding are grouped into 4 types, and each type is appeared with defined protortion.
3. Landslides occur in all lay of the land.
4. Landslides area makes good use for farmland.View full abstractDownload PDF (1376K) -
Hisao FUJITA1990 Volume 26 Issue 4 Pages 37-44
Published: March 25, 1990
Released on J-STAGE: February 25, 2011
JOURNAL FREE ACCESSFor the slopes along dam reservoir, waterlevel fluctuations according to the dam operations for floods control have some effects on the slope stability.
Especially at the first storage of reservoir, we have often found landslides occurred along the reservoirs. In this report, two cases of landslide experienced at a dam are shown on their geological features and the mechaism of slide affected by the ascending of water level . For decaying of activation of sliding, countermeasures were constructed, and then slide movement have not reacted even though at the higher water level than that of sliding occurred.View full abstractDownload PDF (1128K) -
Hiroshi YAGI, Yuji MARUO, Kiyoshi SAIJO, Saburo NAKAMURA1990 Volume 26 Issue 4 Pages 45-49
Published: March 25, 1990
Released on J-STAGE: February 25, 2011
JOURNAL FREE ACCESSDownload PDF (5784K)
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