Journal of Mmij最新文献_第8页

Achievement for Pilot Test of Excavating and Ore Lifting Conducted for Seafloor Polymetallic Sulphides 海底多金属硫化物开采提矿中试成果

Journal of Mmij Pub Date : 2019-06-30 DOI: 10.2473/JOURNALOFMMIJ.135.42

Norihiro Yamaji, N. Okamoto, S. Shiokawa, S. Kawano, Hironobu Sakurai

引用次数: 10

Effect of Testing Method Type and Specimen Size on Mode I Fracture Toughness of Kimachi Sandstone 试验方法类型和试样尺寸对木町砂岩I型断裂韧性的影响

Journal of Mmij Pub Date : 2019-05-31 DOI: 10.2473/JOURNALOFMMIJ.135.33

M. Kataoka, Y. Obara, Leona Vavro, K. Souček, Sang-Ho Cho, Sang-Sun Jeong

{"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}

引用次数: 5

Toward the development of local energy sources 发展地方能源

Journal of Mmij Pub Date : 2019-04-30 DOI: 10.2473/JOURNALOFMMIJ.135.31

J. Kodama

引用次数: 0

Mechanical Behavior and Permeability of Simulated Rock with Single Fracture under Brittle and Ductile Conditions 脆性和延性条件下单裂隙模拟岩石力学行为与渗透性

Journal of Mmij Pub Date : 2019-03-31 DOI: 10.2473/JOURNALOFMMIJ.135.25

Sho Takeyama, K. Sakaguchi, N. Watanabe, N. Tsuchiya

引用次数: 0

Spreadsheet Solutions for Rheological Properties and Viscoplastic Fluid Flow in Circular Pipes and in Parallel-plates 流变特性和粘塑性流体在圆管和平行板中的流动的电子表格解决方案

Journal of Mmij Pub Date : 2019-02-28 DOI: 10.2473/JOURNALOFMMIJ.135.15

N. Hatakeyama, Y. Shimizu, T. Masuyama

{"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}

引用次数: 0

Electrocatalytic Activity of Pt Oxide Electrode for CO2 Reduction 氧化铂电极对CO2还原的电催化活性

Journal of Mmij Pub Date : 2019-02-28 DOI: 10.2473/JOURNALOFMMIJ.135.8

K. Ohkubo, Hiroki Takahashi, M. Taguchi

引用次数: 0

Desorption of Carbon Dioxide from Monoethanolamine Solution Using Ultrasound and Calcium Chloride 超声和氯化钙解吸单乙醇胺溶液中的二氧化碳

Journal of Mmij Pub Date : 2019-01-31 DOI: 10.2473/JOURNALOFMMIJ.135.1

T. Fujiwara, H. Okawa, Takahiro Kato, K. Sugawara

引用次数: 3

Measurement Accuracy and Case Studies of Monitoring System for Rock Slope Using Drone 岩质边坡无人机监测系统测量精度及实例研究

Journal of Mmij Pub Date : 2018-12-31 DOI: 10.2473/JOURNALOFMMIJ.134.222

Y. Obara, T. Yoshinaga, M. Hamachi