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Volume 50 (2009 - 201･･･
- Issue 6 Pages 319-
- Issue 5 Pages 262-
- Issue 4 Pages 202-
- Issue 3 Pages 126-
- Issue 2 Pages 70-
- Issue 1 Pages 2-
Volume 50, Issue 2
Displaying 1-4 of 4 articles from this issue
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Original Article
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Kana KIYOTA, Akira MURAKAMI, Satoru KAWASAKIArticle type: Original Article
2009 Volume 50 Issue 2 Pages 70-78
Published: 2009
Released on J-STAGE: March 11, 2013
JOURNAL FREE ACCESSSoils dredged from the farm ponds to improve the water quality and the efficiency of storage of reservoirs cannot easily be dealt with or transferred to be reused because of high water content. In this paper, a series of laboratory experiments is carried out to examine a solidification procedure of such soil based on the biochemical grouting technique, e.g., the biogrout, instead of existing procedure using chemical solidification mixture which fills the fissure and the pore in soil using microorganic metabolism with colloidal silica. It is revealed from the test tube experiments that a set of 5ml of colloidal Silica, 1.25g of yeast and 0.3g of glucose is effective in dealing with 5g of dredged soil. Existing microorganism and organic nourishment source nutrition involved dredged soil is applicable to the biochemical reaction through the examination of the compounding ratio of the biochemical grout to the dredged soil, and the amount of dredged soil to be necessary for solidification within the biochemical grout processing. It is also found that the biogrout declines the plastic index of dredged soil and solidify the soil by comparing the penetration of the fall cone test before and after the biochemical grout processing under the same water contents.View full abstractDownload PDF (3077K) -
Naoto UCHIDA, Yoshitake ETOU, Takashi OOKAWA, Kouji IKUSADAArticle type: Original Article
2009 Volume 50 Issue 2 Pages 79-88
Published: 2009
Released on J-STAGE: March 11, 2013
JOURNAL FREE ACCESSThe mechanical properties of conglomerate are strongly dominated by mechanical properties of gravel and matrix.
If a conglomerate consists of multiple types of gravel and matrices, quantitave studies with high accuracy on the mechanical properties of those components are highly important for evaluation of mechanical properties of the conglomerate.
In order to contribute to rational evaluation of mechanical properties of conglomerate, applicability of the equotip is studied in this paper. First, by testing multiple types of rocks, it is clarified that rebound hardness is applicable for gross estimation of unconfined compressive strength of the rock. And the applicable range of rebound hardness is suggested.
Next, by using artificial material for the specimen, quantitave evaluation is executed for the influence of properties of rocks such as size and hardness upon the rebound hardness.
Finally, it is confirmed that rebound hardness is applicable for engineering grouping and rock mass classification of conglomerate which is composed of multiple types of gravel and matrices.View full abstractDownload PDF (2273K)
Report
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Shigenobu HIRAIDE, Shigeko HARUYAMA, Hiroomi NAKAZATO, Kong MENG, Soth ...Article type: Report
2009 Volume 50 Issue 2 Pages 89-97
Published: 2009
Released on J-STAGE: March 11, 2013
JOURNAL FREE ACCESSFluvial depositional environment is not studied because of long-term political probrem in Cambodia. To clarify thickness of alluvial deposits and bedrocks along the Mekong river is one of objectives of this study for understanding landform developments.
Additionally, groundwater resources is very important as stable water resources in study area where water supply system is not provided. For development of groundwater resources, more detailed information of groundwater is necessary to drill each wells. Especially, the information of groundwater of quaternary where drilling is relatively easy, is important for developments of groundwater resources.
Therefore, Vertical Electric Sounding (VES) is conducted at each landforms such as flood plain for investigation to know resistivity distribution in subsurface around Phnom Penh City. And, the laboratory experiment is conducted to clarify the electrical feature of stratum. From results of VES and laboratory experiments, sand layer can be identified and estimated. Based on these results and data, groundwater resources were estimated.View full abstractDownload PDF (5319K) -
JSEG Research Commission of The Iwate-Miyagi Nairiku Earthquake in 2 ...Article type: Report
2009 Volume 50 Issue 2 Pages 98-108
Published: 2009
Released on J-STAGE: March 11, 2013
JOURNAL FREE ACCESSA big earthquake of JMA scale magnitude 7.2 occurred at 8:43 on June 14th in 2008. The hypocenter of the quake was 8 kilometers underground of the mountainous area of the Iwate-Miyagi prefectural border. The strong ground motion (maximum acceleration of 1G at 260 meters depth) and the significant surface displacement (over 2 meters rise in elevation) were observed close to the epicenter. Many large scale landslides and many natural dams are striking geological phenomena caused by this earthquake. To estimate these distinctive slope failures, we should consider the relationships among the geology, the geological structure, and the engineering properties of the ground under the strong ground motion.
Japan Society of Engineering Geology (JSEG) dispatched the research commission to the stricken area on September 14th to 15th. Characteristically, these slope failures mainly occurred at several spots underlain by Neogene to Pleistocene volcanic and pyroclastic rocks with occasional soft thin beds of lacustrine sediment layers. The temporary results of the research were reported at the JSEG annual congress held in Yokohama, October 31st, and the images of them was also uploaded onto the website of JSEG.
This report presents the results of the above mentioned fact-finding research and additional field surveys. Geological conditions of the researched area are described, and the processes and the mechanisms of these slope failures are discussed in this paper.View full abstractDownload PDF (4534K)
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