著者 西垣 誠| 小松 満| 金 萬鎰|
発行日 2003-08
出版物タイトル 環境制御
25巻
資料タイプ 紀要論文
JaLCDOI 10.18926/fest/15045
フルテキストURL 014_023_028.pdf
著者 Chegbeleh Larry Pax| 西垣 誠| Akudago John Apambilla| Alim Md. Abdul| 小松 満|
抄録 During underground space development, groundwater seepage mostly occurs which may seriously affect the stability of deep excavations as well as retard progress of construction. For smooth progress of work, effective construction and operation of a disposal facility for high level radioactive waste (HLW), it is important to control seepage into excavations by sealing off fractures or fissures and excavation disturbed zones (EDZ) to control groundwater inflow during the construction phase of such a facility. In this study, a series of experiments were conducted on ethanol/bentonite slurries in the laboratory with the aim of determining the effect of a hydrophilic solvent such as ethanol on the hydraulic and injection characteristic of bentonite slurry for the sealing of fissures to control ground water seepage during the construction phase of a repository. Preliminary results revealed ethanol/bentonite slurry as an effective grouting material capable of penetrating micro fractures (100μm or less) and with the permeability of the grouted medium being as low as 10E-7cm/s. The results also show that the effectiveness and efficiency of grouting is dependent on the type of injection and fissure size. Dynamic injection was observed to be efficient as it was able to inject high dense slurry.
キーワード Dynamic injection permeability swelling bentonite clay
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2009-03-16
14巻
1号
開始ページ 23
終了ページ 28
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002307422
JaLCDOI 10.18926/fest/15044
フルテキストURL 014_017_022.pdf
著者 Akudago John Apambilla| 西垣 誠| Chegbeleh Larry Pax| 小松 満| Alim Md. Abdul|
抄録 Soil-groundwater salinity issues have assumed a worldwide dimension. It is believed that when groundwater level is less than 2 m there is the possibility of salinity transfer between the soil and groundwater due to factors such as capillary forces. One-dimensional column tests were conducted in the laboratory to find a suitable capillary cut design. The capillary cut material comprised a 20 cm thick 2–4.7 mm and a combination of 2–4.7 mm and 9.5–19 mm gravel material. In all, four different designs were tested by compacting Oji sand in the various columns. Groundwater level of 0.75 m from the top was maintained while salt solution of 10% concentration was allowed to flow under capillary forces through the columns. The water content in the columns were monitored using frequency domain reflectrometry-vector analyzer (FDR-V) after which soil samples from 10 m interval in each column was taken for electrical conductivity measurements. The results showed that 5 cm thick, 2–4.7 mm gravel sandwiching coarser material (e.g. 5 cm thick 9.5–19 mm or 10 cm thick 9.5–19 mm gravel material) proved to be very useful design to cut capillarity.
キーワード soil-groundwater salinity capillary cut filter media design
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2009-03-16
14巻
1号
開始ページ 17
終了ページ 22
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002308001
JaLCDOI 10.18926/fest/15043
フルテキストURL 014_013_016.pdf
著者 Alim Md. Abdul| 西垣 誠| Chegbeleh Larry Pax| Akudago John Apambilla| 小松 満|
抄録 Soil-water characteristic curve (SWCC) is an important soil function in an unsaturated soil mechanics field for design and analyses of any unsaturated earth structures. Determination of SWCC is not easy and more so time consuming. Generally, ceramic disc with high air-entry value has been used in the pressure plate apparatus for this purpose by many people. Now-a-days membrane filter is being used as a suitable alternative to ceramic disc. However, experience shows, it has disadvantage of breakage after one time use especially with coarse grain soils (sandy soils). In this study, membrane filter with stainless wire mesh was used to solve this problem and the SWWC was compared with the results obtained without wire mesh. Results showed that membrane filter with stainless wire mesh can be used to determine the SWCC for coarse grain soils.
キーワード SWCC Unsaturated sandy soils Membrane filter Stainless wire mesh
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2009-03-16
14巻
1号
開始ページ 13
終了ページ 16
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002307956
JaLCDOI 10.18926/fest/12829
フルテキストURL 13_063_066.pdf
著者 Akudago Apambilla John| 西垣 誠| Chegbeleh Larry Pax| Alim Md. Abdul| 小松 満| 熊丸 耕志|
抄録 Filters are essential in the design of embankments/dams, drains and wells for water and oil supplies. As a result of these functions, filter use is increasing. In order to use the required filter, various empirical relations have been given based on mathematical and field experience. However, these guidelines have not worked to perfection considering the fact that clogging within the filter face is a serious challenge. A short review on filter design criteria is given in this script coupled with a numerical formulation to propose the design limits.
キーワード filter particle clogging filter classification numerical model equation force of attraction
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2008-03
13巻
1号
開始ページ 63
終了ページ 66
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002304909
JaLCDOI 10.18926/fest/12814
フルテキストURL 13_001_005.pdf
著者 Chegbeleh Larry Pax| 西垣 誠| Akudago John Apambilla| Alim Md. Abdul| 小松 満|
抄録 In an effort to secure the comfort of all aspect of life and security through electricity production, research, nuclear weapons production and medical uses, radioactive waste is being generated throughout the world as a result. Without pro – active management and protection, the hazardous nature of radioactive materials can pose serious threats to human health and the environment. A waste containment or disposal facility is required to isolate the waste from man and the biosphere to avoid any undue radiation exposure. Deep geological repository or disposal facility is considered as an effective way to isolate high level radioactive waste, HLW from the human environment, for which a multi – barrier system plays a very significant role. In this paper, literature collection was carried out, aimed to overview the present knowledge about the concepts of repository for HLW and to identify technologies that are currently available in the nuclear industry worldwide and the current state of barrier technologies for hazardous waste sites.
キーワード repository bentonite radioactive waste swelling buffer and backfill materials
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2008-03
13巻
1号
開始ページ 1
終了ページ 5
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002304817
JaLCDOI 10.18926/fest/11577
フルテキストURL 005_107_112.pdf
著者 Tohari Adrin| 西垣 誠| 小松 満|
抄録 Failures of railway embankments in Japan usually occur during rainfall period due to the rise of water level in the embankments. Laboratory experiments were carried out to elucidate the initiation of failure of embankment under the rise of water level. The changes in pore-water pressure were monitored during the rise of water table and at the initiation of failures. The experiment results showed that main failure of embankment was initiated by development of localized unstable area at the toe of the embankment models during the rise of water level. This indicates that failure of embankments was a consequence of instability of the toe of the slope induced by saturation process under drained condition.
キーワード embankment failure process seepage face toe failure overall instability
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2000-02-29
5巻
1号
開始ページ 107
終了ページ 112
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313411
JaLCDOI 10.18926/fest/11531
フルテキストURL 006_047_052.pdf
著者 小松 満| 西垣 誠|
抄録 For evaluating subsurface contamination, sampling method (boring) is commonly used, but this method cannot monitor the change of in-situ contamination and concentration with respect to time. The purpose of this study is to develop a measuring system for subsurface contamination in which a so-called FDR-V system (Frequency Domain Reflectometry with Vector network analyzer) was employed to measure the salinity contaminant. This FDR-V method is a coaxial probe method,which allows the measurement of the complex dielectric constant from 1GHz to 18GHz. The experimental study indicates the possibility in measuring both the salinity concentration and volumetric moisture content.
キーワード Dielectric constant Subsurface Salinity concentration Volumetric moisture content
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2001-02-28
6巻
1号
開始ページ 47
終了ページ 52
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313354
JaLCDOI 10.18926/fest/11503
フルテキストURL 008_053_062.pdf
著者 A.M. Dewan| 西垣 誠| 小松 満|
抄録 Flood becomes regular feature in riverrine Bangladesh. Every year, around 21 percent of land is flooded during monsoon season, however, in severe situation this figure shot up to more than 60 percent of total land. This paper is an attempt to analyze hydrological characteristics of two catastrophic events (1988 and 1998 flood) in the light of flood history in Bangladesh. The analysis demonstrates that the 1998 flood was more severe than the 1988 one. Moreover, the 1998 flood was also prolonged than the 1988 flood due to heavy rainfall inside and outside of the country. Finally, flood management issues in Bangladesh have been analyzed and found that structural solution to mitigate flood is not the only solution. Based on the analysis some possible mitigation options are put foward.
キーワード Flood Flood Management Danger level Peak floods Deforestation
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2003-03
8巻
1号
開始ページ 53
終了ページ 62
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313768
JaLCDOI 10.18926/fest/11500
フルテキストURL 008_039_052.pdf
著者 Kankam-Yeboah Kwabena| Dapaah-Siakwan Stephen| 西垣 誠| 小松 満|
抄録 Increasing human population, changing lifestyles and environmental considerations have resulted in increased utilization of groundwater resources worldwide. Thus, in turn, has led to the decline of groundwater levels in some countries and Ghana is no exception to this problem. To augment the availability of groundwater resources for various uses, numerous techniques have been developed in many part of the world, one of which is the construction of underground dams. The successful construction and utilization of underground dams, however, depends very much on the physical and hydrogeological conditions at the dam sites. Ghana is underlain by Precambrian crystalline igneous and metamorphic rocks ; and Paleozoic consolidated sedimentary formations. There are further subdivided and described locally as the Birimian, Dahomeyan, Buem, Togo Series, Tarkwaian, Granites, Voltain, Coastal Block Fault, Coastal Plain and Quaternary Alluvium. The review of these and the pre-requisite conditions necessary for the construction of underground dams indicate that underground dams could be constructed and utilized in some parts of Ghana, especially where the overburden is shallow, in the Dahomeyan granites and in the recent formations consisting of alluvial and coastal sands and gravels. This paper is part of a continuing research programme being carried out by the authors.
キーワード hydrogeology geology underground dam sand-storage dam sub-surface dam water supply
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2003-03
8巻
1号
開始ページ 39
終了ページ 52
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313713
JaLCDOI 10.18926/fest/11466
フルテキストURL 009_099_110.pdf
著者 Dewan A.M.| 西垣 誠| 小松 満|
抄録 Dhaka city, the capital of Bangladesh and home for more than 10 million people, has been affected by seasonal flooding almost in every year, however, the situation aggravates depending on rainfall and surrounding river waters. The aim of this paper is to delineate the flood extent in Dhaka city using digital elevation model (DEM), an integral part of geographic information system. Catastrophic floods of the 1988 and 1998 events are taken into consideration. Hydro-meteorological assessment of these events revealed that the 1988 flood was severe due to the lack of flood protection in the city together with transboundary flow of the major rivers while the 1998 flood was become deluge due to incessant monsoonal downpour along with early peaked of the river water levels. The 1998 event has done colossal damage in the city compare to the 1988 event. Flood extent estimation showed that DEM data is very precious to model inundation in the city, however, in order to be spatially explicit flood model, high resolution DEM is necessary. Finally, flood management issues are reviewed and found that combination of structural and nonstructural measures are necessary to help reducing flood induced losses and damage in the city.
キーワード Dhaka City Floods Digital Elevation Model 1998 and 1988 Floods
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2004-02-27
9巻
1号
開始ページ 99
終了ページ 110
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313678
JaLCDOI 10.18926/fest/11464
フルテキストURL 009_087_098.pdf
著者 Kankam-Yeboah Kwabena| Gyau-Boakye Philip| 西垣 誠| 小松 満|
抄録 Three principal river basins are found in Ghana and the Volta River Basin is the major one, covering about three -quarters of Ghana. The basin is shared with Mali, Burkina Faso, Cote d'Ivoire, Togo and Benin. Water from the Volta River Basin is used for drinking water supply, generating hydro-electric power, irrigation, inland fisheries and lake transport. The sustainable management of the Volta River Basin is thus of great importance. Land use activities in the basin are thus closely monitored not only in Ghana, but also in the other riparian countries as well. This paper presents information and data on the water resources and environmental management of the Volta River Basin in Ghana.
キーワード water resources environmental management Volta River Basin Ghana water utilization
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2004-02-27
9巻
1号
開始ページ 87
終了ページ 98
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313917
JaLCDOI 10.18926/fest/11433
タイトル(別表記) Measuring Method of Water Content for High compacted Bentonite Block by using Frequency Domain Reflectometry
フルテキストURL 011_057_064.pdf
著者 西垣 誠| 小松 満| 千々松 正和|
抄録 In the high-level radioactive waste disposal project, in order to know the infiltration behavior, it have to be examined that the bentonite buffer material is used as a barrier, and the measuring device of moisture with the high accuracy is required. In this study it is discussed the usefulness for Frequency Domain Refrectometry (FDR) method through the measuring dielectric constant and making the calibration curve for the several kinds of bentonite material block (pure and silica sand mixing).
キーワード Measuring syatem Bentonite Volumetric mousture content Frequency domain reflectometry
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2006-03-15
11巻
1号
開始ページ 57
終了ページ 64
ISSN 1341-9099
言語 Japanese
論文のバージョン publisher
NAID 120002313913
JaLCDOI 10.18926/fest/11431
フルテキストURL 011_051_055.pdf
著者 西垣 誠| 小松 満| Akudago John Apambilla| Shinshi Yoshihide| Kawakami Kenji| Kumamaru Koji|
抄録 A laboratory validation of a proposed new method of determining the in-situ effective porosity of unsaturated soils was carried out on unsaturated river sand. The proposed method consists of boring a small diameter hole into the soil and inserting an Amplitude Domain Reflectometry (ADR) probe at the bottom part of the hole. Water is supplied into the hole till saturation and later de-saturated. The water content with time is determined from the ADR probe voltage potential readings. The effective porosity is determined from the difference between the saturated and de-saturated water contents. However, in the laboratory, the water is supplied through the top and bottom parts of the sample. From the experiments the obtained effective porosity ranged from 0.28 to 0.29 for wetting from the top with an average of 0.287 and 0.29 to 0.30 for wetting from the bottom with an average of 0.293. The determined effective porosity ranged from 71.7-73.3% of the real initial porosity of 0.40 of the river sand. The maximum attained degree of saturation during the experiment was 91%. The results indicated that the method will be suitable and useful in determining the effective porosity of medium grained unsaturated soils.
キーワード Underground dam Effective porosity Storage capacity Freshwater development
出版物タイトル 岡山大学環境理工学部研究報告
発行日 2006-03-15
11巻
1号
開始ページ 51
終了ページ 55
ISSN 1341-9099
言語 English
論文のバージョン publisher
NAID 120002313335
著者 小松 満|
発行日 2000-03-25
出版物タイトル
資料タイプ 学位論文