Journal of China University of Mining and Technology最新文献_第7页

Mechanical characteristics and microcosmic mechanisms of granite under temperature loads 温度荷载作用下花岗岩的力学特性及微观机理

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60086-3

XU Xiao-li , GAO Feng , SHEN Xiao-ming , XIE He-ping

{"title":"Mechanical characteristics and microcosmic mechanisms of granite under temperature loads","authors":"XU Xiao-li , GAO Feng , SHEN Xiao-ming , XIE He-ping","doi":"10.1016/S1006-1266(08)60086-3","DOIUrl":"10.1016/S1006-1266(08)60086-3","url":null,"abstract":"<div><p>The relationships between mechanical characteristics of rock and microcosmic mechanism at high temperatures were investigated by MTS815, as well as the stress-strain behavior of granite under the action of temperatures ranging from room temperature to 1200 °C. Based on a micropore structure analyzer and SEM, the changes in rock porosity and micro structural morphology of sample fractures and brittle-plastic characteristics under high temperatures were analyzed. The results are as follows: 1) Mechanical characteristics do not show obvious variations before 800 °C; strength decreases suddenly after 800 °C and bearing capacity is almost lost at 1200 °C. 2) Rock porosity increases with rising temperatures; the threshold temperature is about 800 °C; at this temperature its effect is basically uniform with strength decreasing rapidly. 3) The failure type of granite is a brittle tensile fracture at temperatures below 800 °C which transforms into plasticity at temperatures higher than 800 °C and crystal formation takes place at this time. Chemical reactions take place at 1200 °C. Failure of granite under high temperature is a common result of thermal stress as indicated by an increase in the thermal expansion coefficient, transformation to crystal formation of minerals and structural chemical reactions.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 3","pages":"Pages 413-417"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60086-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79210043","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: 68

Application of GPS technology to build a mine-subsidence observation station GPS技术在矿山沉陷观测站建设中的应用

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60079-6

LÜ Wei-cai , CHENG Shi-guang , YANG Hai-sheng , LIU Da-peng

引用次数: 29

Effect of filler on the self-lubrication performance of graphite antimony composites 填料对石墨锑复合材料自润滑性能的影响

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60091-7

WANG Qi-li , HU Ya-fei , HE Min

引用次数: 3

Separation and analysis of aromatic hydrocarbons from two Chinese coals 两种中国煤中芳烃的分离与分析

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60089-9

DING Ming-jie , LI Wen-dian , XIE Rui-lun , ZONG Ying , CAI Ke-ying , PENG Yao-li , ZONG Zhi-min , XIE Rui-lun , WEI Xian-yong

{"title":"Separation and analysis of aromatic hydrocarbons from two Chinese coals","authors":"DING Ming-jie , LI Wen-dian , XIE Rui-lun , ZONG Ying , CAI Ke-ying , PENG Yao-li , ZONG Zhi-min , XIE Rui-lun , WEI Xian-yong","doi":"10.1016/S1006-1266(08)60089-9","DOIUrl":"10.1016/S1006-1266(08)60089-9","url":null,"abstract":"<div><p>Separation and analysis of aromatic hydrocarbons (AHs) from coals is of considerable significance for both fuel and non-fuel use of the coals. In present work two Chinese bituminous coals were selected for separation of AHs by ultrasonic extraction with CS<sub>2</sub> followed by column chromatography using hexane as eluent. A series of AHs were separated from the two coals and analyzed by GC/MS. FTIR was employed to characterize the raw coals and the extracted residues. The results of GC/MS analysis show that the separated AHs are mono- to tetracyclic arenes, among which the principle AHs are alkyl naphthalenes and phenanthrenes. Obvious differences in the composition and the structure of AHs exist between the two coals, i.e., the AHs from Tongting coal tend to be higher rings compared to those from Pingshuo coal both from the variety and from the abundance of the AHs. FTIR analysis shows that the raw and extracted coals are similar in terms of functional groups, suggesting that the composition and structure of CS<sub>2</sub> extract, especially the AHs, from coals can be used to interpret the coal structure to some extent.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 3","pages":"Pages 432-436"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60089-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82520650","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: 11

A mathematical model of the temperature in a coalfield fire area 煤田火区温度的数学模型

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60075-9

LU Guo-dong , ZHOU Xin-quan , JIANG Jie

{"title":"A mathematical model of the temperature in a coalfield fire area","authors":"LU Guo-dong , ZHOU Xin-quan , JIANG Jie","doi":"10.1016/S1006-1266(08)60075-9","DOIUrl":"10.1016/S1006-1266(08)60075-9","url":null,"abstract":"<div><p>The regular pattern of temperature change in a coalfield fire area while the fire is being extinguished was studied. To determine the extinguishing effect, a series of linear, logarithmic, polynomial or exponential mathematical regression models were constructed using the observed temperature data from the Xinjiang coalfield fire extinguishing project. The quadratic polynomial mathematical model had the best fit. A large coal fire oven was also used to simulate the coal fire extinguishing process. The same mathematical regression experiments were carried out on that observed data. The results verified that the quadratic polynomial mathematical model had the best fit. Therefore, a quadratic polynomial mathematical model is proposed to accurately model the temperature-time relationship in a coalfield fire area. An application to coalfield fire suppression shows that the deduced mathematical model can be used to predict the temperature conditions and to determine the effect of fire extinguishing, thereby helping to speed up the fire suppression process in the coalfield fire area.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 3","pages":"Pages 358-361"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60075-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84727327","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: 8

A virtual test of screening technology based on the AGEIA PhysX 基于AGEIA PhysX的筛选技术虚拟测试

Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60064-4

Ai-min LI, Rui-ling LV, Chu-sheng LIU

引用次数: 8

Reconstruction of paleo river systems and distribution of sedimentary facies of Shanxi and lower Shihezi formations in southern Ordos basin 鄂尔多斯盆地南部山西组和下石河子组古水系重建及沉积相分布

Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60051-6

Chao-yong WANG , Ze-cheng WANG , Ji-lin WANG , Yuan BAO , Xiu-mei HU

{"title":"Reconstruction of paleo river systems and distribution of sedimentary facies of Shanxi and lower Shihezi formations in southern Ordos basin","authors":"Chao-yong WANG , Ze-cheng WANG , Ji-lin WANG , Yuan BAO , Xiu-mei HU","doi":"10.1016/S1006-1266(08)60051-6","DOIUrl":"10.1016/S1006-1266(08)60051-6","url":null,"abstract":"<div><p>The study area is located in the south of Huanxian county, in Yan'an and Puxian counties and to the north of Xi'an. The Shanxi and lower Shihezi formations are important gas-bearing formations. Given our analysis of the direction of rivers, the contents of stable heavy minerals and of feldspar of palaeo river systems, the study area is divided into six palaeodrainage patterns corresponding to six feldspar regions and six sedimentary facies regions. On this basis, the distribution of sedimentary facies was also analyzed. During the Shanxi stage, a delta front was deposited in the Huanxian region and delta plains and fronts were deposited in the Pingliang, Chunhua-Yaoxian and Hancheng-Chengcheng regions. In the Yan'an-Daning region, only a delta front was developed. The distribution of sedimentary facies in the earlier Shihezi stage originated from the Shanxi stage. A delta front was developed in the Huanxian region while a delta plain and front developed in the Pingliang-Zhenyuan region during the same time. Lakes originated only in the Zhenyuan-Huanxian-Huachi-Zhengning and Daning-Jixian zones. This analytical method shows that different palaeodrainage patterns can be effectively distinguished in order to forecast sedimentary facies.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 241-244"},"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)60051-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89164292","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: 11

Location of high seismic activity zones and seismic hazard assessment in Zabrze Bielszowice coal mine using passive tomography Zabrze Bielszowice煤矿地震高活动区定位及地震危险性评价

Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60038-3

A LURKA

引用次数: 44

Synthesis and properties of physically crosslinked poly (vinyl alcohol) hydrogels 物理交联聚乙烯醇水凝胶的合成及性能研究

Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60057-7

Ru-yin MA, Dang-sheng XIONG

引用次数: 29

Particle characteristics and rheological constitutive relations of high concentration red mud 高浓度赤泥颗粒特性及流变本构关系

Journal of China University of Mining and Technology Pub Date : 2008-06-01 DOI: 10.1016/S1006-1266(08)60056-5

Xing WANG , Yuan-yuan QU , Wei-wei HU , Jie CHEN , Xue-yi ZHAO , Miao WU

{"title":"Particle characteristics and rheological constitutive relations of high concentration red mud","authors":"Xing WANG , Yuan-yuan QU , Wei-wei HU , Jie CHEN , Xue-yi ZHAO , Miao WU","doi":"10.1016/S1006-1266(08)60056-5","DOIUrl":"10.1016/S1006-1266(08)60056-5","url":null,"abstract":"<div><p>Red mud has relatively small solid particles (<em>d</em><sub>50</sub>=13.02 μm) and will flow in paste form under high pressure during pipeline transport. Red mud belongs to a two-phase flow of materials with high viscosity and a high concentration of non-sedimentation, homogeneous solid-liquids. It is difficult to test its rheological properties under atmospheric pressure. Measurements such as rotational viscometry can not reflect the real state of the material when it is flowing in a pipe. Tested rheological parameters are somewhat higher than the actual values. In our investigation, grain shape, distinctive modality and grain size distribution of red mud were tested. Based on the principle of tube measurement, rheological experiments on red mud at different concentrations were carried out by using our independently developed tube-type pressure rheology test facility, and obtained constitutive equations. We conclude that red mud behaves as non-Newtonian pseudo-plastic fluid in pipe flows. Its consistency and power-law indices vary considerably with different concentrations.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 2","pages":"Pages 266-270"},"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)60056-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89537408","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