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Volume 50 (1997 - 199･･･
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Predecessor
Volume 50, Issue 2
Displaying 1-19 of 19 articles from this issue
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Yukichi KONOHIRA1997 Volume 50 Issue 2 Pages 1-3
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Katsuo SASAHARA, Kazushige EBIHARA1997 Volume 50 Issue 2 Pages 5-13
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSIn order to examine shear strength of unsaturated sandy soil, unsaturated triaxial tests on 3 kinds of sandy soil were carried out, and some analysis were also carried out based on the results. The shear strength characteristics of unsaturated sandy soil are mentioned below.
(1) Internal friction angle is constant even if suction changes.
(2) Cohesion added by suction is proportional to logarithm of suction (pF).
(3) Because linear relation exists between pF and moisture ratio, Cohesion added by suction is proportional to moisture ratio.
Based on these results, stability of plain sliding slope composed by unsaturated sandy soil is examined. The results are that critical slope gradient becomes smaller in proportion with moisture ratio and drop of critical slope gradient becomes higher as the decrease of cohesion added by suction becomes larger.View full abstractDownload PDF (1060K) -
Shun OHKUBO, Takahisa MIZUYA, Masasayuki KABA, Kiyoo IDO1997 Volume 50 Issue 2 Pages 14-19
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSSlit sabo dams are increasingly attracting attention because the use of this type of sabo dam is more effective not only for environmental preservation, but also for disaster prevention than conventional sabo dams. The role of slit sabo dams as a function of sediment control was examined through numerical simulation. A sabo dam with narrow and deep slits acts to lower its peak sediment discharge rate but are not able to decrease its total sediment discharge because most of the sediment deposited at the slit sabo dam is re-eroded by the water flow every time a recession occurs. A series of slit sabo dams is, however, not necessarily effective for sediment control, as is true of ordinary sabo dams. Rather, sabo dams that are capable of trapping a large quantity of sediment, when they are empty of sediment, contribute most to checking the quantity of sediment discharge.View full abstractDownload PDF (5321K) -
Tamotsu TAKAHASHI, Hirofumi TSUJIMOTO, Yoshifumi SATOFUKA, Ryuta TAKEU ...1997 Volume 50 Issue 2 Pages 20-25
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
JOURNAL FREE ACCESSTo contribute for delineation of the hazardous area by the Merapi type pyroclastic flows, a theory for the mechanics of the flow and deposition is presented. In this model, the flow mechanism transits from the granular flow upstream to the fluidized one downstream associated with the crush of the particles caused by inter-particle collisions. In the granular flow the particles are mainly sustained by the inelastic collisions, whereas in the fluidized flow, the particles are sustained by the large scale turbulence and up-lifting force of the upward gas flow emitted from the material itself. The flow continues to run down leaving the base layer in which the driving force due to gravity does not exceed the resistance force. Using this model, the 1991 pyroclastic flow at Mt. Unzen-lake were reproduced by the 2-D numerical simulation. The results of calculation well explain the actual phenomena.View full abstractDownload PDF (4352K) -
Kazuo BABA, Kyoichi MATSUMURA, Hiroshi YOSHIDA1997 Volume 50 Issue 2 Pages 26-31
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Akira ODA, Hikoshichi ABE, Takahisa MIZUYAMA, Toshiji ENDO1997 Volume 50 Issue 2 Pages 32-35
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Masahide ITOH1997 Volume 50 Issue 2 Pages 36-41
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Masahide ITOH1997 Volume 50 Issue 2 Pages 42-44
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Hiroshi MAENO, Satoshi TAYAMA, Hiroyuki MATSUYAMA1997 Volume 50 Issue 2 Pages 45-49
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Takeo KAWAMICHI1997 Volume 50 Issue 2 Pages 50-54
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Takehiko OHTA1997 Volume 50 Issue 2 Pages 55-60
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Kuniaki MIYAMOTO1997 Volume 50 Issue 2 Pages 61-67
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Noriyuki MINAMI, Ryosuke TSUNAKI, Nobutomo OSANAI, Kazunori FUJISAWA, ...1997 Volume 50 Issue 2 Pages 68-73
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Ryosuke TSUNAKI, Noriyuki MINAMI, Osamu FUJIMOTO1997 Volume 50 Issue 2 Pages 74-77
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Kazutoki ABE, Yukio MASHIMA, Kiyoshi IWAI, Hirohiko MIYASHITA1997 Volume 50 Issue 2 Pages 78-81
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Takashi JITOUSONO, Etsuro SHIMOKAWA, Yukiyoshi TERAMOTO1997 Volume 50 Issue 2 Pages 82-86
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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Koji NOGUCHI1997 Volume 50 Issue 2 Pages 87-89_2
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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[in Japanese]1997 Volume 50 Issue 2 Pages 93
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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1997 Volume 50 Issue 2 Pages A1-A2
Published: July 15, 1997
Released on J-STAGE: April 30, 2010
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