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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

Impact of Underground Mining on Shaft Lining and Aquifer in Eastern China

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Open Journal of Geology 2012年第3期2卷 158-164页

作者： Qing Yu Hideki Shimada Takashi Sasaoka kikuo matsui Department of Earth Resources Engineering Faculty of Engineering Kyushu University Fukuoka Japan

Serious shaft lining ruptures have often occurred in the eastern part of China since 1987 due to the complicated geological conditions. This paper tries to find out the relationship between mechanisms of shaft lining rupture and the underground mining process. The analysis is based on the existence typical engineering and geological conditions in eastern China;the impact of underground mining on the shaft lining and aquifer layer is analyzed by using numerical method. The impact factors such as different depths, thicknesses, mining widths of coal seam and different distances to the shaft are used in the analysis. The mining area under the aquifer which near the shaft lining has a significant impact on the shaft lining due to mining process, and increases the risk of occurrence of shaft lining rupture.

关键词： Shaft Lining Impact Underground Mining Aquifer Numerical Simulation

Relation between Fluidability of Flyash Cement and Properties of Flyash Particles

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Open Journal of Geology 2013年第3期3卷 216-221页

作者： Hideki Shimada Akihiro Hamanaka Takashi Sasaoka kikuo matsui Department of Earth Resources Engineering Kyushu University Fukuoka Japan

A large amount of waste is produced by preparation plants. The properties of the waste vary depending on the mineralogical contents of the mother rock in which the coal is embedded. The waste quality depends on the method of mining and cleaning. The waste mainly consists of clays, quartz, carbonaceous materials, mica, pyrites, and so on. About 80% of coal-ash is now utilized and the remainder is disposed of at disposal sites. However, the life span of disposal sites is limited, and it is difficult to find new disposal sites. It is therefore requested that the percentage of utilized flyash be increased in all applicable fields in Japan. Thus, it is very desirable that cement supplemented with flyash be used as injection material for natural/artificial openings. With this perspective in mind, we attempt to clarify how much the size and shape of the flyash affects the properties of the injection mixture by way of an injection test.

关键词： Flyash Fluidability Particle Size Particle Shape

Numerical Study on an Applicable Underground Mining Method for Soft Extra-Thick Coal Seams in Thailand

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Engineering（科研） 2012年第11期4卷 739-745页

作者： Nay Zarlin Takashi Sasaoka Hideki Shimada kikuo matsui Department of Earth Resources Engineering Kyushu University Fukuoka City Japan

The EGAT Mae Moh Mine is the largest open pit lignite mine in Thailand and it produces lignite about 16 million tons annually. In the near future, the pit limit of the mine will be reached and underground mine will then be developed through the open pit in the depth of 400 - 600 m from the surface. However, due to the challenges for underground mining such as poor geological conditions, extra thickness (20 - 30 m) of coal seams, and weak mechanical properties of coal seams and the surrounding rock, the success possibility of underground mining and an applicable underground mining method is being investigated at the present. The paper discusses the applicability of multi-slice bord-and-pillar method for the soft extra thick coal seams in the Mae Moh mine by means of numerical analyses using the 3D finite difference code “FLAC3D”.

关键词： Multi-Slice Bord-and-Pillar Method Soft Extra-Thick Coal Seams Numerical Analyses Flac3D

Development of Flash Setting Material for Temporally Pipeline Restoration after Earthquake

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Open Journal of Geology 2013年第2期3卷 94-100页

作者： Hideki Shimada Akihiro Hamanaka Takashi Sasaoka kikuo matsui Department of Earth Resources Engineering Kyushu University Fukuoka Japan

There are many earthquakes in Japan. If a large earthquake were to occur, it is necessary to consider how pipelines such as: gas, sewage, telecommunications, and so on are restored quickly. At that time, damaged gas pipelines are very dangerous because fire in large areas could be caused by the leakage of gas from the damaged pipeline. Accordingly, it is necessary for gas companies to stop the supply of gas to houses over a large area. Once the gas supply is stopped, there is a considerable amount of time to repair the pipelines over the area. For this reason, a quick method for restoring damaged gas pipelines would be useful after an earthquake. Recently, we have been developing new flash setting material for the damaged gas pipeline by an injection into the house connection of gas when the gas supply is stopped quickly in an emergency. From these points of view, in order to clarify to what degree the contents of flash settling material affect the properties of the injected fly ash mixture causing heavy damage to the gas pipeline in an earthquake, different combinations of fly ash, chemical agents and water were considered in several experiments.

关键词： Flyash Surfactant Injection Material Offshore Structure

Lateral Stress Concentration in Localized Interlayer Rock Stratum and the Impact on Deep Multi-Seam Coal Mining

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International Journal of Geosciences 2013年第9期4卷 1248-1255页

作者： Mingwei Zhang Hideki Shimada Takashi Sasaoka kikuo matsui Department of Earth Resources Engineering Faulty of Engineering Kyushu University Fukuoka Japan

To explore the impact of lateral stress concentration in interlayer rock stratum on the exploitation of protected coal seam, a field experiment was carried out in a multi-seam mining structure. Lateral stress redistribution and interlayer rock failure behavior were surveyed. Then an assistant numerical investigation was implemented to evolve the effect of liberated seam mining and its influence on stress reconstruction in surrounding rock mass. The cause of lateral stress concentration and its impact were discussed finally. Key findings turn out that a certain lateral stress increases in interlayer rock stratum and concentrates on its lower region. Lateral stress concentration and interlayer rock failure are interactional. The former is an inducing factor of the latter;the latter promotes the increase of concentration degree. Extent of lateral stress concentration increases to the maximum as seam distance is about 50 m. But the efficacy of liberated seam mining decreases as the seam spacing gets larger. Protected seam mining is then classified based upon the impact of lateral stress concentration, which helps to prevent the rock burst hazard and then to achieve a reliable mining in deep mines.

关键词： Lateral Stress Concentration Interlayer Rock Stratum Multi-Seam Coal Mining Stress Relaxation Zone Floor Failure Behavior

Behavior of Surrounding Soil during Construction and Its Countermeasures Using Pipe Jacking Method in Deep Strata

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Open Journal of Geology 2013年第2期3卷 44-48页

作者： Takashi Senda Hideki Shimada Takashi Sasaoka kikuo matsui Department of Earth Resources Engineering Kyushu University Fukuoka Japan

In Japan when urban infrastructures need to be constructed, the difficulty of utilizing the ground or shallow strata will lead to a more frequent use of the deep strata. The common construction methods are open-cut, pipe jacking, and shield methods. In recent years, a new pipe jacking method has been established that can be adapted to 20 m below the ground or more. Using this method, the drivage machine and the jacking pipe continue to move an underground until the completion of the driving. Therefore an over-cutting area (so-called tail-void) must be formed to lower the friction between the ground and the pipe. The tail-void is filled with lubrications. However, because the stress release from the ground continues to advance when the tail-void is formed, hence there are some challenges required to cope with the stability of the surrounding ground. In order to utilize the pipe jacking method in the deeper strata layers, the theory, analysis and installation of tail-void have to be systemized, and such systematic data must be stored. Therefore, the conditions of tail-void in the deep pipe jacking method are discussed using numerical analyses.

关键词： Pipe Jacking System Deep Strata Tail-Void

Influence of Stope Design on Stability of Hanging Wall Decline in Cibaliung Underground Gold Mine

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International Journal of Geosciences 2013年第10期4卷 1-8页

作者： Purwanto Hideki Shimada Takashi Sasaoka Ridho K. Wattimena kikuo matsui 1Department of Earth Resources Engineering Faculty of Engineering Kyushu University Fukuoka Japan 2Department of Geology Engineering Mining Engineering Study Program Hasanuddin University Makassar Indonesia Department of Earth Resources Engineering Faculty of Engineering Kyushu University Fukuoka Japan Department of Mining Engineering Faculty of Mining and Petroleum Engineering Bandung Indonesia

Cibaliung Underground Gold Mine applies cut and fill mining method to optimize ore production and maintain underground stability. Existing 5 m × 5 m height and width of stope geometry has a potential new design to increase production of gold due to variety of thick ore, however serious shotcrete failures often occur in hanging wall decline. This paper aims to find out the relationship between stope design and stability of hanging wall decline. The analysis conducted in this study is based on underground characteristics and geological condition of Cibaliung area. The impact of stope design on decline stability was analyzed by using numerical methods. The impact factors such as different rock mass, size of stope, and distance between stope and hanging wall decline were used in the analysis of underground stability especially stability on hanging wall decline.

关键词： Stope Hanging Wall Decline Cut and Fill Cibaliung

Soil Erodibility Characteristics of Reclamation Area--A Case Study in Indonesian Coal Mining

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Journal of Civil Engineering and Architecture 2014年第7期8卷 855-859页

作者： Hideki Shimada Sri Maryati Akihiro Hamanaka Takashi Sasaoka kikuo matsui Department of Earth Resources Engineering Faculty of Engineering Kyushu University Fukuoka 8190395 Japan Faculty of Mathematics and Natural Sciences Universitas Negeri Gorontalo Gorontalo 96128 Indonesia

Soil erosion is one of the most important problems in Indonesia coal mining reclamation area because located in tropical areas which has high average of rainfall. Severe soil erosion leads to the unsuccessful reclamation progress in the post mine surface due to impact on steep slope and limit of seedling establishment. Considering the impact of soil erosion in mining activities, Indonesian government had issued several regulations related to erosion control. Soil erodibility is one of the main factors controlling soil erosion. It will determine amount of soil loss and total sediment. Estimation of soil erodibility aims to determine the susceptibility of soil to be eroded by water. The estimation considers soil texture, percentage of organic matter, soil structure and soil permeability. This study was integration between field work to collect soil sample, soil laboratory analysis, soil erodibility analysis using erodibility equation Wischmeier and Smith (1978) and analysis to predict soil erosion/ annual total soil loss. The results show that soil erodibility in study area was calculated to range from 0.091 to 0.142 tons ha h/ha/MJ/mm and soil erodibility of the study area was categorized as very low and low. There are strong relationships between soil erodibility and soil erosion but the correlation was not fully linier due to other factors controlling soil erosion / annual total soil loss.

关键词：土壤可蚀性复垦区印尼煤矿水土流失治理土壤侵蚀特征土壤流失