Journal of Mmij最新文献

{"title":"Analyzing the Impacts of Rainfall on Rock Slope Behavior in Une Mine and Evaluating the Effec-Tiveness of Countermeasure Methods","authors":"Noriyoshi Ozawa","doi":"10.2473/journalofmmij.134.208","DOIUrl":"https://doi.org/10.2473/journalofmmij.134.208","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"1554 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86504996","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}

{"title":"Limestone Mining and Slope Management at Mt. Buko","authors":"J. Yamatomi, T. Sugiyama, Kazunari Mikami, T. Wakisaka, U. Yamaguchi","doi":"10.2473/JOURNALOFMMIJ.134.161","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.161","url":null,"abstract":"the end of March 2017, the 36 years long cooperative operations mined out about 248 million tonnes of limestone. The mechanical behavior of the Mt. Buko ’ s rock slope has been monitored by several kinds of devices and methods since November 1994. In September 2007, a heavy rainfall of a typhoon caused unprecedentedly distinct but short-term movements in some part of the rock slope, which made the three mining companies intensify monitoring and prompt groundwater drainage from the rock slope. In order to reduce permeation of rain into limestone, paving works of roads on the rock slope are being carried out. Moreover, twenty three steel pipes (80 m long × 600 mm in diameter) were piled into the rock slope and retaining rock piles of total weight of some 2.4 million tonnes are being constructed to reinforce the sher resistance of invisible planes of weakness.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"89 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75713159","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}

{"title":"Relationship between the Groundwater Fluctuation and Deformation Behavior of Rock Slope at Mt. Buko","authors":"M. Kondo, Noriyoshi Ozawa, H. Aoyama, Kazufumi Yano","doi":"10.2473/JOURNALOFMMIJ.134.188","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.188","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81779899","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}

{"title":"Effect of Calcination Temperature on the Hydroxyl Radical Generation of Calcined Dolomite Suspension","authors":"K. Hoshiba, Josiane Ponou, Gjergj Dodbiba, H. Ito, Tasuku Sase, H. Matsui, T. Fujita","doi":"10.2473/JOURNALOFMMIJ.134.151","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.151","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82321624","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}

{"title":"Monitoring of the Surface Displacements of the Final Slope at Mt.Buko","authors":"Tsurugi Nakatani, Kota Fujimaki, Yusuke Hirasawa, Fumitaka Akiyama, Taisuke Miyayumi, Kyohei Tanaka","doi":"10.2473/JOURNALOFMMIJ.134.170","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.170","url":null,"abstract":"This study examines reliable methods to monitor and manage the stability of a limestone rock slope. The surface displacement of the rock slope of Mt. Buko has been measured over the past 20 years, employing several tools and methods including automated polar system (APS), global positioning system (GPS), and leveling. The rock slope of Mt. Buko will eventually reach gigantic proportions; it will be 800 m high × 5 km long at the end of mining operations. Monitoring work was often associated with data that oscillated irregularly due to negative influences from environmental factors such as temperature, atmospheric pressure, and humidity. However, APS measurements have provided the less fluctuation data by calculating differences in slope distance. The differences in slope distance are obtained by subtracting the slope distance at a reference point in the least displaced area from those at other points. GPS measurements have provided baseline analysis data by setting the reference point in the least area. The GPS data can be converted into slope distance and compared with APS data, and the result of this has shown there are no discrepancies between two types of data. Employing APS and GPS has enabled highly accurate monitoring that produced reliable data due to cross comparisons of each data source.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82020284","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}

{"title":"Monitoring of a Rock Slope Using Crack Displacement Measurements in an Observation Drift at the Une Mine","authors":"H. Aoyama, Kazufumi Yano, M. Kondo, Noriyoshi Ozawa, Tsurugi Nakatani","doi":"10.2473/JOURNALOFMMIJ.134.179","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.179","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74119766","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}

{"title":"Numerical Analysis on Air-Lift Pumping System for Mining Rare-Earth Rich Mud","authors":"Y. Shimizu, N. Hatakeyama, T. Masuyama","doi":"10.2473/JOURNALOFMMIJ.134.142","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.142","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"43 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77935926","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}

{"title":"Current Situation of Coal Industry in the World","authors":"S. Tomita, Shuhei Okabe","doi":"10.2473/JOURNALOFMMIJ.134.137","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.137","url":null,"abstract":"the world are changing due to fluctuations in coal prices, policies of governments of various countries, and so on.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83731864","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}

{"title":"Modeling of the Frictional Behavior at the Contact Surface between the Different Materials Constituting Methane Hydrate Production Well","authors":"Masayo Kakumoto, Y. Sakamoto, K. Miyazaki, K. Aoki, Akira Takiguchi, Aya Yasui, J. Mori","doi":"10.2473/JOURNALOFMMIJ.134.117","DOIUrl":"https://doi.org/10.2473/JOURNALOFMMIJ.134.117","url":null,"abstract":"117 http://doi.org/10.2473/journalofmmij.134.117 *2018 年 2 月 22 日受付 2018 年 7 月 13 日受理 1. 正会員 工博 国立研究開発法人産業技術総合研究所 創エネルギー研究部門 研究員 2. 正会員 工博 国立研究開発法人産業技術総合研究所 創エネルギー研究部門 メタンハイドレート地盤特性研究グループ長 3. 正会員 工博 国立研究開発法人産業技術総合研究所 地圏資源環境研究部門 主任研究員 Depressurization process is regarded as the most effective process for gas recovery method from the viewpoints of gas productivity and economic efficiency among in-situ dissociation processes of Methane Hydrate (MH) existing in marine sediments. However, it is supposed that consolidation and deformation of the stratum occurs due to MH dissociation and increase of effective stress in the stratum during operation of depressurization. Consolidation and deformation wreak negative friction on the production well. As a result, the production well may suffer large compressive or tensile stress. In the worst case, it may cause shear failure, tension failure and crushing. Therefore, in order to improve the accuracy for evaluation of stress distribution occurring on production well during depressurization, it is necessary to construct the numerical model enable to reproduce unsteady change of the relationship between shear stress and strain occurring on the contact surface between well and layer and introduce into geo-mechanical simulator. In this study, targeting three contact surface locating above depressurization interval such as 1) casingcement, 2) casing-layer and 3) cement-layer consisting of different material, we conducted push-out test in laboratory in order to evaluate the frictional behavior at these contact surface based on the relationship between displacement and axial load. From experimental observation, it was found that shear stress occurring on the contact surface linearly increased at the initial stage in the case of steel-cement specimen. On the other hand, for specimens consisting steel-clay and cement-clay, non-linear increase of shear stress was confirmed in the process leading to the shear strength. In addition, shear strength τmax for each contact surface increased depending on effective stress σ ', effective friction angle δ ' and effective cohesion c' as failure criteria was estimated based on τ max and σ '. Then, constitutive equation of variable compliance type was applied for reproduction of the relationship between displacement and shear stress observed in a series of push-out test. Through numerical simulation by introduction of this constitutive equation, we confirmed the validity of modeling of the frictional behavior.","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81641839","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}

{"title":"Solvent Extraction of Rhodium from Chloride Solutions added Tin(II) with Amine Extractants","authors":"A. Ishikawa, Takeshi Tanishige, Asaka Tai, Tasuma Suzuki, Masakazu Niinae","doi":"10.2473/journalofmmij.134.131","DOIUrl":"https://doi.org/10.2473/journalofmmij.134.131","url":null,"abstract":"","PeriodicalId":16502,"journal":{"name":"Journal of Mmij","volume":"52 5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77375638","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}