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Journal of China University of Mining and Technology最新文献

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Numerical analysis of water inrush from working-face floor during mining 采动工作面底板突水数值分析
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60034-6
Qing-hua ZHU, Mei-mei FENG, Xian-biao MAO
{"title":"Numerical analysis of water inrush from working-face floor during mining","authors":"Qing-hua ZHU,&nbsp;Mei-mei FENG,&nbsp;Xian-biao MAO","doi":"10.1016/S1006-1266(08)60034-6","DOIUrl":"10.1016/S1006-1266(08)60034-6","url":null,"abstract":"<div><p>Confined water in the Ordovician limestone is one of the hidden troubles that threaten safe production of mines in north China. A numerical model of the key strata was developed. It included the structural characteristics and mechanical properties of the floor rock at the working face of a particular coal mine. The model was used to predict failure modes and to help establish rules for safe mining above the aquifer. The distribution of deformation, failure and seepage was simulated by using Dilian Mechsoft's Realistic Failure Process Analysis (RFPA2D) program. The stress distribution, the deformation and the flow vectors were also obtained. The results indicate that: 1) The original balance of the stress and seepage fields is disturbed due to coal mining; and 2) As the working face advances different deformation, or failure, appears in the surrounding rocks, the water-resisting strata in floor may be destroyed and the passage of water from the aquifer into the mine may occur. The combined action of mining stress and water pressure ultimately lead to water inrush from the floor.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 159-163"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60034-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88588510","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: 26
Suction characteristics of a thick material pump at high concentrations of coal slime 浓料泵在高浓度煤泥条件下的吸力特性
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60044-9
Xing-min MA , Qiao-zhi ZHAO , Shao-gang GAO , Miao WU
{"title":"Suction characteristics of a thick material pump at high concentrations of coal slime","authors":"Xing-min MA ,&nbsp;Qiao-zhi ZHAO ,&nbsp;Shao-gang GAO ,&nbsp;Miao WU","doi":"10.1016/S1006-1266(08)60044-9","DOIUrl":"10.1016/S1006-1266(08)60044-9","url":null,"abstract":"<div><p>A test system was designed to study the parameters affecting the volumetric efficiency of a thick-material pump for coal slime. The parameters studied included solid concentration, the slenderness ratio of the suction cylinder and the running speed of the hydraulic cylinder. In the experiment the concentrations of coal slime were 75.7%, 76.3%, 74.4%, 73.5%, 72.1% and 70.63%; the running speeds were 0.23, 0.18, 0.13, 0.10 and 0.08 m/s; and the slenderness ratios of the suction cylinder were 1.63, 2.26, 2.88, 3.50, 4.13, 4.78 and 5.38. The results show that the suction volumetric efficiency decreases gradually with an increase in material concentration. The critical concentration value is 72%; below 72% the suction volumetric efficiency is above 90%, otherwise it decreases rapidly. When the solid concentration reaches 76.3%, the suction volumetric efficiency is only 40%. When the running speed of the piston is less than or equal to 0.23 m/s, the suction volumetric efficiency increases with an increase in running speed.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 210-213"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60044-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91442526","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: 3
Kinetics of the leaching of TiO2 from Ti-bearing blast furnace slag 含钛高炉渣中TiO2浸出动力学研究
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60058-9
Xiaohong Liu, G. Gai, Yu-fen Yang, Z. Sui, Li Li, J. Fu
{"title":"Kinetics of the leaching of TiO2 from Ti-bearing blast furnace slag","authors":"Xiaohong Liu, G. Gai, Yu-fen Yang, Z. Sui, Li Li, J. Fu","doi":"10.1016/S1006-1266(08)60058-9","DOIUrl":"https://doi.org/10.1016/S1006-1266(08)60058-9","url":null,"abstract":"","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"53 1","pages":"275-278"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86908638","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: 42
Focal mechanism caused by fracture or burst of a coal pillar 煤柱破裂或爆裂引起的震源机制
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60033-4
Anye Cao, Lin-ming Dou, Guo-xiang Chen, S. Gong, Yu-gang Wang, Zhi-H. Li
{"title":"Focal mechanism caused by fracture or burst of a coal pillar","authors":"Anye Cao, Lin-ming Dou, Guo-xiang Chen, S. Gong, Yu-gang Wang, Zhi-H. Li","doi":"10.1016/S1006-1266(08)60033-4","DOIUrl":"https://doi.org/10.1016/S1006-1266(08)60033-4","url":null,"abstract":"","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"53 1","pages":"153-158"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87615766","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: 12
Argillization mechanics of rock from the Xing'anling Group in the Beier depression of the Hailar basin 海拉尔盆地贝尔凹陷兴安岭群岩石泥化机理
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60050-4
Qin-fu LIU , Zheng FU , Bao-quan YANG
{"title":"Argillization mechanics of rock from the Xing'anling Group in the Beier depression of the Hailar basin","authors":"Qin-fu LIU ,&nbsp;Zheng FU ,&nbsp;Bao-quan YANG","doi":"10.1016/S1006-1266(08)60050-4","DOIUrl":"10.1016/S1006-1266(08)60050-4","url":null,"abstract":"<div><p>The reservoir of the Xing'anling Group in the Beier depression of the Hailar basin is loosely cemented with many tuffaceous grains. This causes argillization and collapse of the grain framework of the reservoir sandstones. A detailed study on the characteristics of rocks and minerals was carried out through polarized microscope, X-ray diffraction, X-ray fluorescence, SEM and energy spectrum analysis. The results indicate that the reason for argillization is the abundant pyroclastic, and especially tuffaceous, grains in the reservoir. The alkaline component is relatively high in some strata. These are easily altered to montmorillonite in diagenesis. Na<sup>+</sup> montmorillonite swells strongly when exposed to water. This is the fundamental reason for the reservoir's argillization and plugging.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 237-240"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60050-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80543718","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
Numerical analysis of grinding power consumption of a vertical planetary mill 立式行星磨机磨削功率消耗的数值分析
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60066-8
Xue-di HAO , Dong-mei ZHU , Zhi-rui BIAN , Xin WANG
{"title":"Numerical analysis of grinding power consumption of a vertical planetary mill","authors":"Xue-di HAO ,&nbsp;Dong-mei ZHU ,&nbsp;Zhi-rui BIAN ,&nbsp;Xin WANG","doi":"10.1016/S1006-1266(08)60066-8","DOIUrl":"10.1016/S1006-1266(08)60066-8","url":null,"abstract":"<div><p>Planetary wheel rolling on a coal-bed was simplified as rigid wheel rolling on the coal-bed with a rigid base when a Vertical planetary mill (VPM) is running. Based on our analysis, we conclude that the Bekker formulation for computing rolling resistance is not applicable to calculate directly the rolling resistance of the wheel. According to the principle of the Bekker apparatus, pressure-sinkage curves were obtained by tests on a piece of mono-axial consolidation apparatus used in soil-mechanics. The deformation modulus of the coal-bed was calculated using elastic mechanics. A finite element model of the planetary wheel coal-bed was built up by the use of a rigid and a Drucker-Prager material model in LS-DYNA. According to the simulation results, the wheel rolling resistance, the grinding power consumption and the motor power of the mill were calculated and the mistake in the initial design of the mill was modified. The simulation results agree well with the results of the semi-industrial tests.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 311-315"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60066-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82989466","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: 2
Ash melting behavior by Fourier transform infrared spectroscopy 用傅里叶变换红外光谱分析灰渣熔化行为
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60052-8
Han-xu Li, X. Qiu, Y. Tang
{"title":"Ash melting behavior by Fourier transform infrared spectroscopy","authors":"Han-xu Li, X. Qiu, Y. Tang","doi":"10.1016/S1006-1266(08)60052-8","DOIUrl":"https://doi.org/10.1016/S1006-1266(08)60052-8","url":null,"abstract":"","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"66 1","pages":"245-249"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74803558","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: 9
Multi-object optimization design for differential and grading toothed roll crusher using a genetic algorithm 基于遗传算法的差动分级齿辊破碎机多目标优化设计
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60067-X
La-la ZHAO, Zhong-bin WANG, Feng ZANG
{"title":"Multi-object optimization design for differential and grading toothed roll crusher using a genetic algorithm","authors":"La-la ZHAO,&nbsp;Zhong-bin WANG,&nbsp;Feng ZANG","doi":"10.1016/S1006-1266(08)60067-X","DOIUrl":"10.1016/S1006-1266(08)60067-X","url":null,"abstract":"<div><p>Our differential and grading toothed roll crusher blends the advantages of a toothed roll crusher and a jaw crusher and possesses characteristics of great crushing, high breaking efficiency, multi-sieving and has, for the moment, made up for the shortcomings of the toothed roll crusher. The moving jaw of the crusher is a crank-rocker mechanism. For optimizing the dynamic performance and improving the cracking capability of the crusher, a mathematical model was established to optimize the transmission angle <em>γ</em> and to minimize the travel characteristic value <em>m</em> of the moving jaw. Genetic algorithm is used to optimize the crusher crank-rocker mechanism for multi-object design and an optimum result is obtained. According to the implementation, it is shown that the performance of the crusher and the cracking capability of the moving jaw have been improved.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 316-320"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60067-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73145253","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: 6
Development of 30Cr06A, a high strength cast steel and its welding ability 研制了30Cr06A，一种高强度铸钢及其焊接能力
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60063-2
You-jin GAO
{"title":"Development of 30Cr06A, a high strength cast steel and its welding ability","authors":"You-jin GAO","doi":"10.1016/S1006-1266(08)60063-2","DOIUrl":"10.1016/S1006-1266(08)60063-2","url":null,"abstract":"<div><p>High performance hydraulic supports have a high requirement in strength, toughness and welding ability of socket material. Targeting this problem, we analyzed the properties of the high strength socket material 30Cr06, used in high performance hydraulic supports both at home and abroad and developed a new kind of high strength cast steel 30Cr06A, by making use of an orthogonal experiment, which provided the design conditions for its optimal composition. The result shows that the strength and toughness of the newly developed high strength cast steel 30Cr06A is much better than that of 30Cr06. Theoretical calculations, mechanical property tests and hardness distribution tests of welded joints were carried out for a study of the welding ability of the new material, which is proved to be very good. Therefore, this 30Cr06A material has been successfully used in the socket of high performance hydraulic support.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 296-299"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60063-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73921415","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: 3
Numerical analysis of gas emission rule from a goaf of tailing roadway 尾砂巷道采空区瓦斯涌出规律数值分析
Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60035-8
Zong-xiang LI , Zhi-an HUANG , Ai-ran ZHANG , Jian-guo SONG
{"title":"Numerical analysis of gas emission rule from a goaf of tailing roadway","authors":"Zong-xiang LI ,&nbsp;Zhi-an HUANG ,&nbsp;Ai-ran ZHANG ,&nbsp;Jian-guo SONG","doi":"10.1016/S1006-1266(08)60035-8","DOIUrl":"10.1016/S1006-1266(08)60035-8","url":null,"abstract":"<div><p>Targeting the problem of large amounts of gas emission from the goaf of the No.14201 working face in the Shaqu coal mine of Huajin Coking Coal Co. Ltd., we used a negative exponential function to describe the attenuation process of gas emission in goaf (the stable source) based on the principle of field flow. Equations of two-component flow (gas and air) and seepage-diffusion in a heterogeneous goaf flow field are solved by means of numerical simulation and fluid mechanics principles of air movement and gas distribution during gas emission from goaf. The results indicate that the air diversion volume has a negative, exponential relation with the volume of gas emitted from goaf to the working face and is clearly inversely related to gas concentration. We calculated the minimum amount of air diversion and distributed air volume in the tailing roadway required for safe production.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 164-167"},"PeriodicalIF":0.0,"publicationDate":"2008-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60035-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72616585","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: 1
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