Pub Date : 2019-06-30DOI: 10.2473/JOURNALOFMMIJ.135.42
Norihiro Yamaji, N. Okamoto, S. Shiokawa, S. Kawano, Hironobu Sakurai
{"title":"Achievement for Pilot Test of Excavating and Ore Lifting Conducted for Seafloor Polymetallic Sulphides","authors":"Norihiro Yamaji, N. Okamoto, S. Shiokawa, S. Kawano, Hironobu Sakurai","doi":"10.2473/JOURNALOFMMIJ.135.42","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.42","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"24 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80525918","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 : 2019-05-31DOI: 10.2473/JOURNALOFMMIJ.135.33
M. Kataoka, Y. Obara, Leona Vavro, K. Souček, Sang-Ho Cho, Sang-Sun Jeong
Several testing methods have been proposed for evaluating the mode I fracture toughness of rocks. Since the fracture toughness evaluated from the different testing methods is generally not compared, what is still not well-known is the effect of the testing method type on the fracture toughness. The effect of not only the testing method type but also the specimen size exists in the fracture toughness of rock materials. To clarify the effect of the testing method type and specimen size on the fracture toughness, many fracture toughness tests were performed in the previous experimental studies. However, the effect has not been elucidated because the number of the specimens is limited and the range of the specimen size is relatively small in the previous works. In this paper, firstly, three types of the fracture toughness test, the chevron bend (CB) test, semi-circular bend (SCB) test and straight notched disk bending (SNDB) test, were performed using Kimachi sandstone. Then, the SCB test was carried out using the same sandstone with various specimen sizes. As a result, the fracture toughness obtained from the CB and SCB tests were compatible each other. However, the SNDB tests estimated lower value of the fracture toughness than the others. From the results of the SCB tests with various specimen sizes, the fracture toughness increased with increasing radius. Based on the results, the effect of the specimen size on the fracture toughness and the differences of the fracture toughness obtained from the three testing methods were discussed.
{"title":"Effect of Testing Method Type and Specimen Size on Mode I Fracture Toughness of Kimachi Sandstone","authors":"M. Kataoka, Y. Obara, Leona Vavro, K. Souček, Sang-Ho Cho, Sang-Sun Jeong","doi":"10.2473/JOURNALOFMMIJ.135.33","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.33","url":null,"abstract":"Several testing methods have been proposed for evaluating the mode I fracture toughness of rocks. Since the fracture toughness evaluated from the different testing methods is generally not compared, what is still not well-known is the effect of the testing method type on the fracture toughness. The effect of not only the testing method type but also the specimen size exists in the fracture toughness of rock materials. To clarify the effect of the testing method type and specimen size on the fracture toughness, many fracture toughness tests were performed in the previous experimental studies. However, the effect has not been elucidated because the number of the specimens is limited and the range of the specimen size is relatively small in the previous works. In this paper, firstly, three types of the fracture toughness test, the chevron bend (CB) test, semi-circular bend (SCB) test and straight notched disk bending (SNDB) test, were performed using Kimachi sandstone. Then, the SCB test was carried out using the same sandstone with various specimen sizes. As a result, the fracture toughness obtained from the CB and SCB tests were compatible each other. However, the SNDB tests estimated lower value of the fracture toughness than the others. From the results of the SCB tests with various specimen sizes, the fracture toughness increased with increasing radius. Based on the results, the effect of the specimen size on the fracture toughness and the differences of the fracture toughness obtained from the three testing methods were discussed.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76223833","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 : 2019-04-30DOI: 10.2473/JOURNALOFMMIJ.135.31
J. Kodama
{"title":"Toward the development of local energy sources","authors":"J. Kodama","doi":"10.2473/JOURNALOFMMIJ.135.31","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.31","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"93 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72631433","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 : 2019-03-31DOI: 10.2473/JOURNALOFMMIJ.135.25
Sho Takeyama, K. Sakaguchi, N. Watanabe, N. Tsuchiya
{"title":"Mechanical Behavior and Permeability of Simulated Rock with Single Fracture under Brittle and Ductile Conditions","authors":"Sho Takeyama, K. Sakaguchi, N. Watanabe, N. Tsuchiya","doi":"10.2473/JOURNALOFMMIJ.135.25","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.25","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85869373","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 : 2019-02-28DOI: 10.2473/JOURNALOFMMIJ.135.15
N. Hatakeyama, Y. Shimizu, T. Masuyama
The rheological properties of cement slurries (including fresh concrete and high concentration paste for filling etc.) are complicated, therefore they are approximated by the Bingham plastic model. In recent years, the application of Herschel-Bulkley model is recommended for drilling mud. The rheological coefficients of these models are obtained by using measurement results of the rotational viscometer or experimental results of the flow in a circular pipe, and the pressure loss in pipe flows is obtained from these rheological coefficients. Therefor it is essential to properly select the model in order to design the slurry transportation. In the field of well drilling, the flow in a concentric annulus with a relatively large pipe diameter ratio is approximated by the flow in a parallel-plate, so it is also necessary to consider the flow in a parallel-plate. In this study, first, a method to determine the rheological coefficients by the least squares method from measurement results of the rotational viscometer using the function provided in a spreadsheet is shown and a method to quantitatively select the rheological model using Akaike's information criterion is also shown. Next, after the exact solutions of flows in a circular pipe and in a parallel-plate is summarized, an approximate expression of wall shear stress is derived and the error analysis is performed, and its effectiveness is confirmed by using past experimental data. In addition, a method of calculating the rheological coefficients by the least squares method from measurement results of flows in a circular pipe and in a parallel-plate using spreadsheet is shown and this method is practiced by using the experimental data of the flow in pipes.
{"title":"Spreadsheet Solutions for Rheological Properties and Viscoplastic Fluid Flow in Circular Pipes and in Parallel-plates","authors":"N. Hatakeyama, Y. Shimizu, T. Masuyama","doi":"10.2473/JOURNALOFMMIJ.135.15","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.15","url":null,"abstract":"The rheological properties of cement slurries (including fresh concrete and high concentration paste for filling etc.) are complicated, therefore they are approximated by the Bingham plastic model. In recent years, the application of Herschel-Bulkley model is recommended for drilling mud. The rheological coefficients of these models are obtained by using measurement results of the rotational viscometer or experimental results of the flow in a circular pipe, and the pressure loss in pipe flows is obtained from these rheological coefficients. Therefor it is essential to properly select the model in order to design the slurry transportation. In the field of well drilling, the flow in a concentric annulus with a relatively large pipe diameter ratio is approximated by the flow in a parallel-plate, so it is also necessary to consider the flow in a parallel-plate. In this study, first, a method to determine the rheological coefficients by the least squares method from measurement results of the rotational viscometer using the function provided in a spreadsheet is shown and a method to quantitatively select the rheological model using Akaike's information criterion is also shown. Next, after the exact solutions of flows in a circular pipe and in a parallel-plate is summarized, an approximate expression of wall shear stress is derived and the error analysis is performed, and its effectiveness is confirmed by using past experimental data. In addition, a method of calculating the rheological coefficients by the least squares method from measurement results of flows in a circular pipe and in a parallel-plate using spreadsheet is shown and this method is practiced by using the experimental data of the flow in pipes.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"13 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83361262","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 : 2019-02-28DOI: 10.2473/JOURNALOFMMIJ.135.8
K. Ohkubo, Hiroki Takahashi, M. Taguchi
CO 2 electrochemical reduction. Cyclic voltammetry of the Pt oxide electrode in a CO 2 -saturated H 2 SO 4 solution showed a definite anodic peak at 0.6-0.8 V vs. SHE, which was not observed in an Ar-deaerated electrolyte. Thus, it was determined that the anodic peak could be related to the re-oxidation of the reduction product of CO 2 during cathodic polarization. The activity of the Pt oxide electrode for CO 2 reduction was much higher than that of the Pt electrode. It was concluded that the residual oxygen, which was hardly detected in the Pt electrode, improved the activity for CO 2 electrochemical reduction on the Pt oxide electrode. Gas chromatography-mass spectrometry of the electrolytic solution after CO 2 reduction revealed that the reduction product was mainly CH 3 OH. These results should be very useful for developing a new electrochemical reduction system for converting CO 2 into CH 3 OH.
{"title":"Electrocatalytic Activity of Pt Oxide Electrode for CO2 Reduction","authors":"K. Ohkubo, Hiroki Takahashi, M. Taguchi","doi":"10.2473/JOURNALOFMMIJ.135.8","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.8","url":null,"abstract":"CO 2 electrochemical reduction. Cyclic voltammetry of the Pt oxide electrode in a CO 2 -saturated H 2 SO 4 solution showed a definite anodic peak at 0.6-0.8 V vs. SHE, which was not observed in an Ar-deaerated electrolyte. Thus, it was determined that the anodic peak could be related to the re-oxidation of the reduction product of CO 2 during cathodic polarization. The activity of the Pt oxide electrode for CO 2 reduction was much higher than that of the Pt electrode. It was concluded that the residual oxygen, which was hardly detected in the Pt electrode, improved the activity for CO 2 electrochemical reduction on the Pt oxide electrode. Gas chromatography-mass spectrometry of the electrolytic solution after CO 2 reduction revealed that the reduction product was mainly CH 3 OH. These results should be very useful for developing a new electrochemical reduction system for converting CO 2 into CH 3 OH.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82031566","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 : 2019-01-31DOI: 10.2473/JOURNALOFMMIJ.135.1
T. Fujiwara, H. Okawa, Takahiro Kato, K. Sugawara
{"title":"Desorption of Carbon Dioxide from Monoethanolamine Solution Using Ultrasound and Calcium Chloride","authors":"T. Fujiwara, H. Okawa, Takahiro Kato, K. Sugawara","doi":"10.2473/JOURNALOFMMIJ.135.1","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.135.1","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"280 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80129689","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 : 2018-12-31DOI: 10.2473/JOURNALOFMMIJ.134.222
Y. Obara, T. Yoshinaga, M. Hamachi
{"title":"Measurement Accuracy and Case Studies of Monitoring System for Rock Slope Using Drone","authors":"Y. Obara, T. Yoshinaga, M. Hamachi","doi":"10.2473/JOURNALOFMMIJ.134.222","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.222","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89844359","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 : 2018-11-30DOI: 10.2473/JOURNALOFMMIJ.134.159
U. Yamaguchi
{"title":"Rock Slope Monitoring, over 20 years long","authors":"U. Yamaguchi","doi":"10.2473/JOURNALOFMMIJ.134.159","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.159","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"294 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85550950","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 : 2018-11-30DOI: 10.2473/JOURNALOFMMIJ.134.198
M. Kondo, H. Aoyama, Noriyoshi Ozawa, Kazufumi Yano
the rock slope of the Une Mine is now in a stable condition. In addition, a simulation study on the prediction of groundwater behavior by multiple regression analysis suggests that the groundwater level will be well-controlled, even at heavier rainfalls than those recorded in the past.
{"title":"Countermeasures Against Rainfalls: Towards Stabilizing the Slope at the Une Mine","authors":"M. Kondo, H. Aoyama, Noriyoshi Ozawa, Kazufumi Yano","doi":"10.2473/JOURNALOFMMIJ.134.198","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.198","url":null,"abstract":"the rock slope of the Une Mine is now in a stable condition. In addition, a simulation study on the prediction of groundwater behavior by multiple regression analysis suggests that the groundwater level will be well-controlled, even at heavier rainfalls than those recorded in the past.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91160513","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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