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Amelioration of acidic soil using fy Ash for Mine Revegetation in PostMining Land

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International Journal of Coal Science & Technology 2022年第3期9卷 201-206页

作者： Akihiro Hamanaka Takashi Sasaoka hideki shimada Shinji Matsumoto Department of Earth Resources Engineering Faculty of EngineeringKyushu University819-0395 FukuokaJapan Geological Survey of Japan National Institute of Advanced Industrial Science and Technology(AIST)305-8567 TsukubaJapan

This paper described the use of fy ash for soil amelioration of acidic soils to promote plant *** mining sites,acid sulfate soils/rocks,which contain sulfde minerals(*** FeS_(2)),have appeared as a result of overburden *** excessively acidic condition inhibits plant growth due to the dissolution of harmful elements,such as Al,Fe,and *** ash,an alkaline byproduct of coal combustion generated in thermal power plants is expected to be adopted to ameliorate acidic ***,the mixing ratio of fy ash must be considered because excessive addition of fy ash can have a negative impact on plant growth due to its physical/chemical *** pot trials using Acacia mangium demonstrate the evolution of plant growth with a 5%–10%addition of fy ash into acidic *** the acidic soil has a high potential for metal dissolution,the metal ions leached from the acidic soil are large,making it difcult to improve plant growth due to osmotic and ionic *** work suggests that the efects of fy ash on metal ions leached from the soil have to be considered for the amelioration of acidic soil.

关键词： Acid Soil Coal Ash Metal Accumulation Plant Growth

Application of highwall mining system in weak geological condition

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International Journal of Coal Science & Technology 2016年第3期3卷 311-321页

作者： Takashi Sasaoka Tri Karian Akihiro Hamanaka hideki shimada Kikuo Matsui Department of Earth Resources Engineering KyushuUniversity Fukuoka 819-0395 Japan

Almost all the coal is produced from open cut mines in Indonesia. As a consequence of open cut mine application, a great deal of coal is left out in the highwalls of the mined-out pits. Highwall mining systems can be used to recover this coal. The use of highwall mining systems has increasingly come into play in the US and Australia. However, it is not common in Indonesia. Moreover, Indonesia coal measure is categorized as weak geological condition. Some problems are likely to arise during the application of the highwall mining system for example instability of openings and highwalls due to the roof and pillar failures. Therefore, study of highwall mining system application in Indonesia is needed in order to increase the recovery rate of coal mining in Indonesia. This paper described the characteristics of the highwall mining system and discussed the appropriate highwall mining system application in weak geological condition, Indonesia. From the results of a series of laboratory tests and numerical analyses, it can be concluded that the stability of pillars and mine openings in auger mining systems is much higher than that in CHM and an auger mining system is suitable for such as very weak/poor strata conditions. Moreover, the application of backfilling system is very effective for improvement of the stability of pillar and openings.

关键词：开采系统地质条件应用边坡印度尼西亚煤矿生产软土采煤系统

Time effect and prediction of broken rock bulking coefficient on the base of particle discrete element method

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International Journal of Mining Science and Technology 2021年第4期31卷 643-651页

作者： Fanfei Meng Hai Pu Takashi Sasaoka hideki shimada Sifei Liu Tumelo KM Dintwe Ziheng Sha Department of Earth Resources Engineering Faculty of EngineeringKyushu UniversityFukuoka 819-0395Japan State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China College of Mining Engineering and Geology Xinjiang Institute of EngineeringUrumqi 830023China

Bulking characteristics of gangue are of great significance for the stability of goafs in mining overburden in the caving *** this paper,a particle discrete element method with clusters to represent gangue was adopted to explore the bulking coefficient time effect of the broken rock in the caving zone under three-dimensional triaxial compression *** phenomena of stress corrosion,deformation,and failure of rock blocks were simulated in the numerical ***,a new criterion of rock fragments damage was put *** was found that the broken rock has obvious viscoelastic properties.A new equation based on the Burgers creep model was proposed to predict the bulking coefficient of broken rock.A deformation characteristic parameter of the prediction equation was analyzed,which can be set as a fixed value in the mid-and long-term prediction of the bulking *** are quadratic function relationships between the deformation characteristic parameter value and Talbot gradation index,axial pressure and confining pressure.

关键词： Bulking coefficient Time effect Deformation prediction Broken rock Particle discrete element model

Evaluating Rock Mass Properties of Vipingo Coral Limestone Quarry Based on a Modified Geological Strength Index (GSI) and State of Karstification

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Open Journal of Geology 2022年第1期12卷 57-79页

作者： Joan Atieno Onyango Takashi Sasaoka hideki shimada Akihiro Hamanaka Dyson Moses Dintwe Tumelo Earth Resources Engineering Department Kyushu University Fukuoka Japan Mining Materials and Petroleum Engineering Department Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

The process of evaluating rock mass strength requires that major structural features such as joints that influence rock strength are considered. In carbonate rock masses, however, the strength of the rock mass is largely dependent on intact rock strength and structural features play a secondary role. Laboratory experiments on porous rock have shown that intact rock strength reduces with increasing porosity, which has a direct effect on the rock mass strength. Rock porosity has however not been well accounted for in rock mass characterization methods currently in use. This research applies the modified GSI method for carbonate rock masses which is based on a combination of GSI and total porosity. The main aim is to quantify the GSI with respect to rock porosity which is a direct indicator of the state of karstification, as an inherent feature that affects rock mass strength. An empirical equation is proposed whereby the GSI as observed in the field is modified by a natural log of the value of porosity, giving rise to a modified GSI (GSIm). The GSIm together with laboratory properties of rock is used to determine the properties of Vipingo coral limestone from RocLab software. A deterministic parametric slope stability analysis is done using the finite element software Phase 2 with the rock mass properties as input parameters. The analysis results point to a direct dependence of the slope stability on slope angle, slope height and rock mass strength of the lithological unit. The graphs make a useful design guide for slopes engineered in this type of rock mass.

关键词： Carbonates Karstification Porosity Rock Mass Strength Slope Stability Weak Rock

Surface subsidence due to underground mining operation under weak geological condition in Indonesia

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Journal of Rock Mechanics and Geotechnical Engineering 2015年第3期7卷 337-344页

作者： Takashi Sasaoka Hiroshi Takamoto hideki shimada Jiro Oya Akihiro Hamanaka Kyushu University Gerbang Daya Mandari

Subsidence analysis and prediction with measured data have been conducted and applied to local strata and mining conditions worldwide. Underground coal mines chose the most suitable analysis and prediction method for them. However, there was no study based on the measured data of subsidence induced by underground mining operation in Indonesia. This paper describes the condition of underground coal mine in Indonesia and then discusses the subsidence behavior due to longwall mining operation based on measured data in Balikpapan coal-bearing formation in Indonesia.

关键词： Subsidence Underground mining operation Weak strata Prediction

Study on control of rock fragmentation at limestone quarry

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Journal of Coal Science & Engineering(China) 2008年第3期14卷 365-368页

作者： SASAOKA Takashi shimada hideki SASAKI Takayuki ICHINOSE Masatomo MATSUI Kikuo Department of Earth Resources Engineering Faculty of EngineeringKyushu UniversityFukuoka 819-0395Japan

The size distribution of a muck pile depends not on only the blasting standard but also on the mechanical properties,joint system,and crack density of the rock mass. As,the cracks in the rock masses are especially heavily developed at the limestone quar- ries in Japan,they,along with the joints,have a large impact on the effects of blasting, such as the size of the muck ***,if the joint system and/or crack density in a rock mass can be determined and quantitatively evaluated,the blasting operation can be conducted more effectively,efficiently and ***,guidelines for designing ap- propriate blasting standards based on the rock mass conditions have not yet been scien- tifically ***,blasting tests were conducted on different mines and faces, under different geological conditions and blasting standards,in order to determine the im- pacts of each factor on the effects of *** the results of a series of blast- ing tests and described the impacts of geological conditions on the size of the muck pile produced by blast.

关键词：爆破工程爆破标准石灰岩开采场钻孔测量

Mission of the National Cancer Center Hospital in Japan to promote clinical trials for precision medicine

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Cancer Biology & Medicine 2024年第1期21卷 1-3页

作者： Kazuaki shimada Kenichi Nakamura Noboru Yamamoto Department of Hepatobiliary and Pancreatic Surgery National Cancer Center HospitalTokyo 104-0045Japan Clinical Research Support Offce National Cancer Center HospitalTokyo 104-0045Japan Department of Experimental Therapeutics National Cancer Center HospitalTokyo 104-0045Japan

Precision medicine is a growing field *** its potential benefit to many patients,several major obstacles must be overcome before precision medicine can be more widely used in clinical *** main obstacles are associated... 详细信息

关键词： clinical Cancer overcome

The Key Factor of Acid Mine Drainage (AMD) in the History of the Contribution of Mining Industry to the Prosperity of the United States and South Africa: A Review

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Natural Resources 2016年第7期7卷 445-460页

作者： Shinji Matsumoto hideki shimada Takashi Sasaoka Department of Earth Resources Engineering Kyushu University Fukuoka Japan

Mining industry has significantly contributed to the prosperity of the nation with economic growth, whereas mining operation has caused Acid Mine Drainage (AMD) with the abandonment of mines. As some researchers suggest, the history of AMD is, generally, affected by the change in not only mining industry but also in social and economic conditions. Thus, historical analysis is an effective way to find the key factors of AMD. In this study, in order to find the key factors of AMD, we examine the history of the United States (U.S.) and South Africa, where their economy had been developed owing to the large-scale mining, based on the findings in the previous studies. The results indicated that the abandoned mines due to the economic depression triggered AMD in the U.S. and South Africa. While the U.S. had progressively adopted anti-AMD methods in terms of prevention, prediction, and remediation (PPR) as a comprehensive approach, especially since the 1970s onwards because of the rise of environmental consciousness as well as strict regulations, South Africa is at the early stage of implementing the regulations following PPR. The public attention should be directed to environmental conservation in addition to the implementation of the regulations in South Africa. The improvement in socio-economic conditions is, additionally, necessary for the rise of environmental consciousness in South Africa in the light of the three pillars of sustainable development: social, economic, and environmental elements.

关键词： Acid Mine Drainage (AMD) Mining Industry South Africa The United States Historical Analysis Socio-Economic Conditions

Utilization of Coal Ash as a Barrier Material for Radioactive Waste Disposal

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Journal of Geoscience and Environment Protection 2015年第4期3卷 31-43页

作者： Takashi Sasaoka Wahyudi Sugeng hideki shimada Department of Earth Resources Engineering Kyushu University Fukuoka Japan

About 10% of total electricity (386 MkW) was generated by nuclear power plants in the world (2014) and about 58,400 tons of uranium has been mined in uranium mines annually. A plenty of radioactive waste material is produced from uranium mines and nuclear power plants. The wastes must be disposed or stored safely for a long term. Because if they leak and/or move from disposal or storage sites due to air/groundwater flow, then a serious environmental pollution can occur. Hence, multi-layer system has been proposed and employed in order to seal off these radioactive waste materials from biosphere. Basically, bentonite is now used for establishing one of absorbing and sealing layers in this system. However, the amount of high quality bentonite is very limited and in some cases it is hard to be obtained. On the other hand, a great deal of refuse from coal burning plants is produced every year and the amount of it is expected to be higher each year especially in developing countries. More than half of coal ash is utilized and the remaining is disposed at the disposal sites. However, the life of the disposal site is limited and it is difficult to find a new disposal site. It is requested that the percentage of the utilization of the coal ash be increased in every field. From the above two points of view, a fly ash-based barrier system is considered in this research and this paper discusses the applicability of fly ash as a content of barrier material. Based on the results of a series of laboratory tests, it can be concluded that fly ash has a potential for use in the buffer material as the bentonite is substituted.

关键词： Utilization of Coal Ash Radioactive Waste Disposal Bentonite Laboratory Tests