Pub Date : 2013-02-01DOI: 10.2473/JOURNALOFMMIJ.129.65
A. Hosoi, Y. Takasaki, A. Shibayama
{"title":"Pressure Acid Leaching of Printed Circuit Board Waste and Selective Metal Recovery from Extracted Solution","authors":"A. Hosoi, Y. Takasaki, A. Shibayama","doi":"10.2473/JOURNALOFMMIJ.129.65","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.129.65","url":null,"abstract":"","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"31 1","pages":"65-71"},"PeriodicalIF":0.0,"publicationDate":"2013-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87276606","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-01-01DOI: 10.2473/JOURNALOFMMIJ.129.1
Y. Nishimatsu
{"title":"On the Interaction of Mineral Resources, Natural Energy, And Environment","authors":"Y. Nishimatsu","doi":"10.2473/JOURNALOFMMIJ.129.1","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.129.1","url":null,"abstract":"","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"38 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2013-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76152132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-11-25DOI: 10.2473/JOURNALOFMMIJ.127.699
K. Ichitsubo, Masakazu Suzuki, Takaaki Ogami, Tsutomu Suzuki, Keiichi Miura, A. Shibayama, S. Owada
of NaHS addition. Then, we could separate lead components from “ K powder ” with the recovery of 60 % as a lead concentration of 10 ～ 30 Pb wt% under the same condition of sulfidized flotation for the “ K powders ” of various component.
{"title":"Separation of Lead Component from \"K powder\" Generated in Cement Kiln by Sulfidized Flotation:Part1. Determination of Flotation Conditions and Analysis of Reaction Mechanism","authors":"K. Ichitsubo, Masakazu Suzuki, Takaaki Ogami, Tsutomu Suzuki, Keiichi Miura, A. Shibayama, S. Owada","doi":"10.2473/JOURNALOFMMIJ.127.699","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.127.699","url":null,"abstract":"of NaHS addition. Then, we could separate lead components from “ K powder ” with the recovery of 60 % as a lead concentration of 10 ～ 30 Pb wt% under the same condition of sulfidized flotation for the “ K powders ” of various component.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"43 4 1","pages":"689-698"},"PeriodicalIF":0.0,"publicationDate":"2011-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80434550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-08-25DOI: 10.2473/JOURNALOFMMIJ.127.549
Tatsuo Ôta
The periodic table of the elements, shown in Table 1, highlights 17 elements comprising Scanndium, Yttrium and 15 elements known as “lanthanoids”1. The elements are lined up according to the atomic number displayed horizontally and the same type of electrons in the outermost shell vertically. The electron number and type of each element gives the physical and chemical properties2. It can be said that these elements called “rare earth elements” are similar to each other in some physical and chemical characters because the outermost electrons are the same1. Although there is no defined classification in rare earth, Table 2 shows common classifications of two methods. One is to classify into two categories and the other is into three categories. Solubility of potassium sulfate double salt into water is used in the case of three categories, e.g. not to solve; light rare earth, difficult to solve; middle rare earth, easy to solve; heavy rare earth3.
{"title":"Rare Earth Resources and Related Industries in Japan","authors":"Tatsuo Ôta","doi":"10.2473/JOURNALOFMMIJ.127.549","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.127.549","url":null,"abstract":"The periodic table of the elements, shown in Table 1, highlights 17 elements comprising Scanndium, Yttrium and 15 elements known as “lanthanoids”1. The elements are lined up according to the atomic number displayed horizontally and the same type of electrons in the outermost shell vertically. The electron number and type of each element gives the physical and chemical properties2. It can be said that these elements called “rare earth elements” are similar to each other in some physical and chemical characters because the outermost electrons are the same1. Although there is no defined classification in rare earth, Table 2 shows common classifications of two methods. One is to classify into two categories and the other is into three categories. Solubility of potassium sulfate double salt into water is used in the case of three categories, e.g. not to solve; light rare earth, difficult to solve; middle rare earth, easy to solve; heavy rare earth3.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"735 1","pages":"549-557"},"PeriodicalIF":0.0,"publicationDate":"2011-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74020152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-05-25DOI: 10.2473/JOURNALOFMMIJ.127.249
H. Dong, S. Okubo, K. Fukui
{"title":"Influence of Concrete Strength on the Bond Characteristics of Reinforcing Fibers","authors":"H. Dong, S. Okubo, K. Fukui","doi":"10.2473/JOURNALOFMMIJ.127.249","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.127.249","url":null,"abstract":"","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"1027 1","pages":"249-255"},"PeriodicalIF":0.0,"publicationDate":"2011-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77194319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2011-03-25DOI: 10.2473/JOURNALOFMMIJ.127.219
D. Nakamura, T. Goto, Yoji Ito, S. Yamashita, Teruyuki Suzuki, S. Yamasaki
At two different locations in Kitami City, Hokkaido, cracks have been found in bricks, seemingly due to frost damage. In this research, the mechanism of the occurrence of the cracks in the bricks has been looked into through field investigations and exposure experiment. The field investigations have revealed that some bricks located in sun-exposed areas have a higher frequency to crack and cracks occur in the protruded part of bricks. From the exposure experiment, cracks in the bricks have been found to occur in late winter from the end of February to the end of March. It has also been confirmed that the following unique temperature distribution exists when cracks occur in bricks; in late winter, bricks melt due to the daytime heat. If bricks do not melt completely during the daytime leaving some frozen parts and these remain overnight, the melted areas created during the daytime then refreeze surrounded by the frozen parts due to the low night temperatures. In this research, this frost damage caused by such temperature distribution has been defined as closed-type freeze-thaw phenomenon.From the above results, this article describes the mechanism of frost damage to bricks in Kitami City. The research results are considered useful when brick structures are built in cold regions like Hokkaido, ensuring the appropriate use of bricks.
{"title":"Frost Damage to Bricks Observed in Kitami City, Hokkaido","authors":"D. Nakamura, T. Goto, Yoji Ito, S. Yamashita, Teruyuki Suzuki, S. Yamasaki","doi":"10.2473/JOURNALOFMMIJ.127.219","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.127.219","url":null,"abstract":"At two different locations in Kitami City, Hokkaido, cracks have been found in bricks, seemingly due to frost damage. In this research, the mechanism of the occurrence of the cracks in the bricks has been looked into through field investigations and exposure experiment. The field investigations have revealed that some bricks located in sun-exposed areas have a higher frequency to crack and cracks occur in the protruded part of bricks. From the exposure experiment, cracks in the bricks have been found to occur in late winter from the end of February to the end of March. It has also been confirmed that the following unique temperature distribution exists when cracks occur in bricks; in late winter, bricks melt due to the daytime heat. If bricks do not melt completely during the daytime leaving some frozen parts and these remain overnight, the melted areas created during the daytime then refreeze surrounded by the frozen parts due to the low night temperatures. In this research, this frost damage caused by such temperature distribution has been defined as closed-type freeze-thaw phenomenon.From the above results, this article describes the mechanism of frost damage to bricks in Kitami City. The research results are considered useful when brick structures are built in cold regions like Hokkaido, ensuring the appropriate use of bricks.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"14 1","pages":"219-229"},"PeriodicalIF":0.0,"publicationDate":"2011-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84415378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-12-25DOI: 10.2473/JOURNALOFMMIJ.127.8
N. Kamoshida, M. Okawara, Masayoshi Abe, M. Furuzumi
The practical application of the rock cavern storage of liquefied fuels (such as natural gas, liquid hydrogen or dimethyl ether) requires stability analysis of the cavern in question with regard to thermal stress, and an understanding of thermophysical properties and mechanical properties of rock mass is essential for such analysis.In our research, a linear expansion strain measurement test up to —170°C was first conducted using Kimachi sandstone (24.0% porosity) to study the relationship between the freezing of pore water and its expansion strain. Then a uniaxial compression test and indirect tensile test were conducted with wet sandstone cooled down below freezing point to ultralow temperatures to review the influence of the formation of pore ice on the strength of wet sandstone. The following findings were obtained.When Kimachi sandstone is cooled down, frost swelling occurs twice, and therefore the linear expansion coefficient fluctuates over range of temperatures between 0 to —70°C. This may be because pores of two different sizes exist in Kimachi sandstone and the freezing temperature of the pore water differs depending on the pore size. The compressive strength and indirect tensile strength of the wet sandstone increase with the decrease in the specimen temperature. Two causes of this phenomenon may be identified. One is that an increase in pore ice that shares the load is the main cause of the phenomenon in temperatures down to —50°C where freezing of the pore water is almost completed. The other is that an increase in strength by volumetric shrinkage of the rock forming minerals and pore ice is the main cause in temperatures below —50°C.
{"title":"Mechanical Behavior of Kimachi Sandstone under Ultralow Temperature","authors":"N. Kamoshida, M. Okawara, Masayoshi Abe, M. Furuzumi","doi":"10.2473/JOURNALOFMMIJ.127.8","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.127.8","url":null,"abstract":"The practical application of the rock cavern storage of liquefied fuels (such as natural gas, liquid hydrogen or dimethyl ether) requires stability analysis of the cavern in question with regard to thermal stress, and an understanding of thermophysical properties and mechanical properties of rock mass is essential for such analysis.In our research, a linear expansion strain measurement test up to —170°C was first conducted using Kimachi sandstone (24.0% porosity) to study the relationship between the freezing of pore water and its expansion strain. Then a uniaxial compression test and indirect tensile test were conducted with wet sandstone cooled down below freezing point to ultralow temperatures to review the influence of the formation of pore ice on the strength of wet sandstone. The following findings were obtained.When Kimachi sandstone is cooled down, frost swelling occurs twice, and therefore the linear expansion coefficient fluctuates over range of temperatures between 0 to —70°C. This may be because pores of two different sizes exist in Kimachi sandstone and the freezing temperature of the pore water differs depending on the pore size. The compressive strength and indirect tensile strength of the wet sandstone increase with the decrease in the specimen temperature. Two causes of this phenomenon may be identified. One is that an increase in pore ice that shares the load is the main cause of the phenomenon in temperatures down to —50°C where freezing of the pore water is almost completed. The other is that an increase in strength by volumetric shrinkage of the rock forming minerals and pore ice is the main cause in temperatures below —50°C.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"21 1 1","pages":"8-13"},"PeriodicalIF":0.0,"publicationDate":"2010-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85662354","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-25DOI: 10.2473/JOURNALOFMMIJ.125.605
K. Sasaki, T. Yasunami, Y. Sugai
CO2 capture and storage (CCS) is one of expected methods to reduce CO2 emissions into the atmosphere. The Japan consortium to proceed the CO2 sequestration into coal seams carried out the project "Japan CO2 Geosequestration in Coal Seams Project (JCOP) " on CO2 injection and CH4 production during 2002 to 2007 at Yubari City, Hokkaido, which is hereinafter called as Yubari ECBMR pilot test. A targeted coal seam at the project was located about 890m below the surface. The project had a problem on CO2 injection with low injection rate of about 3ton/day. In the pilot-test data, it was observed as a common pattern that CO2 injection rate was decreasing during 3 to 10 days after starting CO2 injection, because of decreasing permeability around the injector. The maximum decreasing ratio of the permeability was evaluated as 1/50 of the initial one. The reason was assumed by swelling of the coal seam around the injector by injection liquid CO2. In this study, an analytical model has been presented in consideration of permeability reduction by swelling. Present predictions on CO2 injection rate with the model have been matched with monitoring data measured at the Yubari ECBMR pilot test. The ratio of permeability reduction of coal seams by the swelling (swelling factor) has been evaluated as 1/50 to 1/16.In this research, numerical simulations, which use double porosity model and Palmer & Mansoori model to express permeability reduction by shrinkage of micro-pores caused by CO2 adsorption, called as coal matrix swelling, has been carried out with the ECLIPS (CBM option) . A history matching study was conducted to estimate CH4 desorption time and production bottom-hole pressure (BHP). Other reservoir parameters such as pore compressibility and gas-water relative permeability curve, were set based on the report of Yubari pilot test and previous researches by Yamaguchi et al. (2007) and Pekot & Reeves (2002) . The numerical simulations for sensitivity studies on CO2 injectivity and CH4 productivity have been carried out by giving CO2 and CH4 adsorption capacities and viscocities of CO2 and water as a function of the coal seam temperature (30 to 60 °C) . Finally, the numerical simulation results with five spot model have been presented to evaluate CO2 injectivity and CH4 productivity by changing the well spacing. The results show that CO2 injection is roughly proportional to number of injectors, however the time at the maximum CH4 production rate is delayed with area including four production wells. From view of economical evaluation, drilling cost of wells and accumulated present value of revenue of CH4 production will be important to decide the optimum well spacing.
{"title":"A Numerical Model and Numerical Simulations in Consideration of Permeability Reduction by Coal-Matrix Swelling for CO_2-ECBMR","authors":"K. Sasaki, T. Yasunami, Y. Sugai","doi":"10.2473/JOURNALOFMMIJ.125.605","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.125.605","url":null,"abstract":"CO2 capture and storage (CCS) is one of expected methods to reduce CO2 emissions into the atmosphere. The Japan consortium to proceed the CO2 sequestration into coal seams carried out the project \"Japan CO2 Geosequestration in Coal Seams Project (JCOP) \" on CO2 injection and CH4 production during 2002 to 2007 at Yubari City, Hokkaido, which is hereinafter called as Yubari ECBMR pilot test. A targeted coal seam at the project was located about 890m below the surface. The project had a problem on CO2 injection with low injection rate of about 3ton/day. In the pilot-test data, it was observed as a common pattern that CO2 injection rate was decreasing during 3 to 10 days after starting CO2 injection, because of decreasing permeability around the injector. The maximum decreasing ratio of the permeability was evaluated as 1/50 of the initial one. The reason was assumed by swelling of the coal seam around the injector by injection liquid CO2. In this study, an analytical model has been presented in consideration of permeability reduction by swelling. Present predictions on CO2 injection rate with the model have been matched with monitoring data measured at the Yubari ECBMR pilot test. The ratio of permeability reduction of coal seams by the swelling (swelling factor) has been evaluated as 1/50 to 1/16.In this research, numerical simulations, which use double porosity model and Palmer & Mansoori model to express permeability reduction by shrinkage of micro-pores caused by CO2 adsorption, called as coal matrix swelling, has been carried out with the ECLIPS (CBM option) . A history matching study was conducted to estimate CH4 desorption time and production bottom-hole pressure (BHP). Other reservoir parameters such as pore compressibility and gas-water relative permeability curve, were set based on the report of Yubari pilot test and previous researches by Yamaguchi et al. (2007) and Pekot & Reeves (2002) . The numerical simulations for sensitivity studies on CO2 injectivity and CH4 productivity have been carried out by giving CO2 and CH4 adsorption capacities and viscocities of CO2 and water as a function of the coal seam temperature (30 to 60 °C) . Finally, the numerical simulation results with five spot model have been presented to evaluate CO2 injectivity and CH4 productivity by changing the well spacing. The results show that CO2 injection is roughly proportional to number of injectors, however the time at the maximum CH4 production rate is delayed with area including four production wells. From view of economical evaluation, drilling cost of wells and accumulated present value of revenue of CH4 production will be important to decide the optimum well spacing.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"1 1","pages":"605-613"},"PeriodicalIF":0.0,"publicationDate":"2009-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86031851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-25DOI: 10.2473/JOURNALOFMMIJ.124.794
Y. Yoshida, H. Shimada, T. Sasaoka, K. Matsui, M. Ichinose, S. Fujita, Masakazu Mineshita, T. Mizunuma
In recent years, many trenchless rehabilitations of pipeline that are considered of residents' living environment and mitigated the influence on traffic have been developed. Although the grouting material is required to make the established pipe and the lining material unify, it has high mobility etc. The grouting material using the material that was mixed the surface-active agent with the flyash was developed. Usage of flyash instead of cement leads to improving mobility, reducing construction cost and so on. In this paper, in order to examine the effect on ambient surroundings of the mixture material developed as grouting material, a fundamental investigation is performed and various these results are discussed.
{"title":"Development of Grouting Material for Rehabilitations of Pipeline Using Flyash-Surfactant Cement Mixture Material","authors":"Y. Yoshida, H. Shimada, T. Sasaoka, K. Matsui, M. Ichinose, S. Fujita, Masakazu Mineshita, T. Mizunuma","doi":"10.2473/JOURNALOFMMIJ.124.794","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.124.794","url":null,"abstract":"In recent years, many trenchless rehabilitations of pipeline that are considered of residents' living environment and mitigated the influence on traffic have been developed. Although the grouting material is required to make the established pipe and the lining material unify, it has high mobility etc. The grouting material using the material that was mixed the surface-active agent with the flyash was developed. Usage of flyash instead of cement leads to improving mobility, reducing construction cost and so on. In this paper, in order to examine the effect on ambient surroundings of the mixture material developed as grouting material, a fundamental investigation is performed and various these results are discussed.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"69 1","pages":"794-800"},"PeriodicalIF":0.0,"publicationDate":"2008-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79638058","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2008-12-25DOI: 10.2473/JOURNALOFMMIJ.124.765
Takahiko Kurakami, J. Yamatomi, R. Sato, Y. Sagawa, Shinsuke Murakami, Koji Tamada
The Hishikari Mine consists of epithermal vein type Au-Ag deposits. The veins are extracted mainly by drifting and bench stoping with backfill. Blasted waste rocks are generally used as backfilling materials and crushed waste rocks with cement are used for larger stopes. Although backfilling controls the displacement of excavation surface and increases the stope stability, practical evaluation for stope dimension in conjunction with backfilling effects is not established. In this study, supporting effects of stope ends were evaluated and available support lines were drawn by using a three-dimensional elastic finite element analysis. Based on available support lines, the properties of backfilling materials were evaluated. The behavior of rock mass in bench stoping was compared with a two-dimensional elasto-plastic finite element analysis. The results indicated more remarkable influence on the stope stability with the backfill stiffness. The Young's modulus of the backfilling materials containing cement at the Hishikari Mine changed from 10 MPa to 1 GPa by numerical analyses and field measurements.
{"title":"Supporting Effects of Backfilling at the Hishikari Mine","authors":"Takahiko Kurakami, J. Yamatomi, R. Sato, Y. Sagawa, Shinsuke Murakami, Koji Tamada","doi":"10.2473/JOURNALOFMMIJ.124.765","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.124.765","url":null,"abstract":"The Hishikari Mine consists of epithermal vein type Au-Ag deposits. The veins are extracted mainly by drifting and bench stoping with backfill. Blasted waste rocks are generally used as backfilling materials and crushed waste rocks with cement are used for larger stopes. Although backfilling controls the displacement of excavation surface and increases the stope stability, practical evaluation for stope dimension in conjunction with backfilling effects is not established. In this study, supporting effects of stope ends were evaluated and available support lines were drawn by using a three-dimensional elastic finite element analysis. Based on available support lines, the properties of backfilling materials were evaluated. The behavior of rock mass in bench stoping was compared with a two-dimensional elasto-plastic finite element analysis. The results indicated more remarkable influence on the stope stability with the backfill stiffness. The Young's modulus of the backfilling materials containing cement at the Hishikari Mine changed from 10 MPa to 1 GPa by numerical analyses and field measurements.","PeriodicalId":21719,"journal":{"name":"Shigen-to-sozai","volume":"65 1","pages":"765-770"},"PeriodicalIF":0.0,"publicationDate":"2008-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87064342","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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