Journal of China University of Mining and Technology最新文献

RC beam strengthened with pre-stressed CFP under the secondary load 二次荷载作用下预应力CFP加固RC梁

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60305-3

Bang-yun LONG, Guang-lin YUAN, Dan-yu ZHU

引用次数: 2

Application of remote-sensing-image fusion to the monitoring of mining induced subsidence 遥感图像融合在开采沉陷监测中的应用

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60289-8

Liang-jun LI , Yan-bin WU

{"title":"Application of remote-sensing-image fusion to the monitoring of mining induced subsidence","authors":"Liang-jun LI , Yan-bin WU","doi":"10.1016/S1006-1266(08)60289-8","DOIUrl":"10.1016/S1006-1266(08)60289-8","url":null,"abstract":"<div><p>We discuss remote-sensing-image fusion based on a multi-band wavelet and RGB feature fusion method. The fused data can be used to monitor the dynamic evolution of mining induced subsidence. High resolution panchromatic image data and multi-spectral image data were first decomposed with a multi-ary wavelet method. Then the high frequency components of the high resolution image were fused with the features from the R, G, B bands of the multi-spectral image to form a new high frequency component. Then the newly formed high frequency component and the low frequency component were inversely transformed using a multi-ary wavelet method. Finally, color images were formed from the newly formed R, G, B bands. In our experiment we used images with a resolution of 10 m (SPOT), and TM30 images, of the Huainan mining area. These images were fused with a trinary wavelet method. In addition, we used four indexes—entropy, average gradient, wavelet energy and spectral distortion—to assess the new method. The result indicates that this new method can improve the clarity and resolution of the images and also preserves the information from the original images. Using the fused images for monitoring mining induced subsidence achieves a good effect.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 531-536"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60289-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79166286","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

CFD simulation of spontaneous coal combustion in irregular patterns of goaf with multiple points of leaking air 多漏风点采空区不规则形态煤自燃CFD模拟

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60284-9

Zong-xiang LI

{"title":"CFD simulation of spontaneous coal combustion in irregular patterns of goaf with multiple points of leaking air","authors":"Zong-xiang LI","doi":"10.1016/S1006-1266(08)60284-9","DOIUrl":"10.1016/S1006-1266(08)60284-9","url":null,"abstract":"<div><p>Based on the non-linear air leakage seepage equation for an anisotropic porous medium, on the seepage diffusion equation of multicomponent gas and on the seepage synthetic heat transfer equation of a porous medium, the numerical model for field flow problems of irregular patterns of a goaf with multiple points of leaking air is established and simultaneously solved by the upwind mode finite element method (G3 computer program). According to the complexity of irregular patterns of a goaf with multiple points of leaking air, the flow pattern in a large area of such a goaf and the variation in gases of methane, oxygen and CO and in temperature are theoretically described. In the calculation, the goaf is regarded as a caving anisotropic medium and the coupling effect of methane effusion on spontaneous combustion is considered. The simulation results agree well with practical experience. In addition, the spontaneous combustion process is also simulated, indicating that 1) the spontaneous combustion often takes place near the area where fresh air leaks in and 2) the fire sources can be classified into static and dynamic zones. Therefore, in practical fire preventing and extinguishing, we should clearly distinguish the upstream air leaking points from the downstream ones in order to take proper measures for leakage stopping.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 504-508, 515"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60284-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81640718","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: 23

Using particle swarm optimization algorithm in an artificial neural network to forecast the strength of paste filling material 利用人工神经网络中的粒子群优化算法对膏体填充材料的强度进行预测

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60292-8

Qing-liang CHANG, Hua-qiang ZHOU, Chao-jiong HOU

引用次数: 17

Evolution of a hydrodynamic field and its effect on hydrocarbon accumulation in the Biyang depression, Henan province 河南泌阳坳陷水动力场演化及其对油气成藏的影响

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60302-8

Yong FU , Qing-hong DONG , Zhen-rui BAI , Wan-jun WANG

{"title":"Evolution of a hydrodynamic field and its effect on hydrocarbon accumulation in the Biyang depression, Henan province","authors":"Yong FU , Qing-hong DONG , Zhen-rui BAI , Wan-jun WANG","doi":"10.1016/S1006-1266(08)60302-8","DOIUrl":"10.1016/S1006-1266(08)60302-8","url":null,"abstract":"<div><p>The hydro-geologic stages in the Biyang Depression, Henan Province, were defined and factors controlling the evolution of the hydrodynamic field in this area were analyzed. The evolution of the paleo-hydrodynamic field was studied by using the method of sedimentary-water-head and the changing patterns of the present hydrodynamic field as determined from measured pressure data. The results show that the evolution of the hydrodynamic field is one of inheritance and that it controls hydrocarbon accumulation. The deposition center in the southeast of the depression is always a high-value zone for water-head and a dynamic-source zone of the hydrodynamic field. The slope zone in the northwest of the depression is always a low-value zone for water-head and is the main discharge area for groundwater; this is the hydrocarbon accumulation zone. Hydrocarbon accumulation is controlled by the hydrodynamic field. The reservoir shows a ring-shaped horizontal pattern. Accumulation occurs in a pressure equilibrium zone at the frontal surface between sedimentary water and infiltrating water. The hydrocarbon accumulations occur in two vertically different discharge units, Eh<sub>3</sub><sup>1</sup> and Eh<sub>3</sub><sup>2</sup> under the action of overpressure.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 599-605"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60302-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85414855","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

Side abutment pressure distribution by field measurement 现场测得侧支台压力分布

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60288-6

Lian-guo WANG , Yang SONG , Xing-hua HE , Jian ZHANG

{"title":"Side abutment pressure distribution by field measurement","authors":"Lian-guo WANG , Yang SONG , Xing-hua HE , Jian ZHANG","doi":"10.1016/S1006-1266(08)60288-6","DOIUrl":"10.1016/S1006-1266(08)60288-6","url":null,"abstract":"<div><p>Given the 7<sub>1</sub>23 working face in the Qidong Coal Mine of the Wanbei Mining Group, nine dynamic roof monitors were installed in the crossheading to measure the amount and velocity of roof convergence in different positions and at different times and three steel bored stress sensors were installed in the return airway to measure rock stress at depth. On the basis of this arrangement, the rule of change of the distribution of the side abutment pressure with the advance of the working face and movement of overlying strata was studied. The rule of change and the stability of rock stress at depth were measured. Secondly, the affected area and stability time of the side abutment pressure were also studied. The results show that: 1) During working, the face advanced distance was from 157 m to 99 m, the process was not effected by mining induced pressure. When the distance was 82 m, the position of peak stress was 5 m away from the coal wall. When the distance was 37 m, the position of peak stress away from the coal wall was about 15 m to 20 m and finally reached a steady state; 2) the time and the range of the peak of side rock pressure obtained from stress sensors were consistent with the results from the dynamic roof monitors; 3) the position of the peak pressure was 25 m away from the coal wall.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 527-530"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60288-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86148995","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: 10

Biotribological behavior of ultra high molecular weight polyethylene composites containing bovine bone hydroxyapatite 含牛骨羟基磷灰石的超高分子量聚乙烯复合材料的生物摩擦学行为

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60303-X

Jin-long LIU, Yuan-yuan ZHU, Qing-liang WANG, Shi-rong GE

{"title":"Biotribological behavior of ultra high molecular weight polyethylene composites containing bovine bone hydroxyapatite","authors":"Jin-long LIU, Yuan-yuan ZHU, Qing-liang WANG, Shi-rong GE","doi":"10.1016/S1006-1266(08)60303-X","DOIUrl":"10.1016/S1006-1266(08)60303-X","url":null,"abstract":"<div><p>Wear particles of ultrahigh molecular weight polyethylene (UHMWPE) are the main cause of long-term failure of total joint replacements. Therefore, increasing its wear resistance or bioactivity will be very useful in order to obtain high quality artificial joints. In our study, UHMWPE composites filled with the bovine bone hydroxyapatite (BHA) were prepared by the method of compression moulding. A ball-on-disc wear test was carried out with a Universal Micro-Tribometer to investigate the friction and wear behavior of a Si<sub>3</sub>N<sub>4</sub> ceramic ball, cross-sliding against the UHMWPE/BHA composites with human plasma lubrication. At the same time, the profiles of the worn grooves on the UHMWPE/BHA surface were scanned. The experimental results indicate that the addition of BHA to UHMWPE had a significant effect on the biotribological behavior of UHMWPE cross-sliding against the Si<sub>3</sub>N<sub>4</sub> ceramic ball. The addition of BHA powder enhanced the hardness and modulus of elasticity of these composites and decreased the friction coefficients and wear rates under conditions of human plasma lubrication. When the added amount of BHA powders was up to 20%∼30%, UHMWPE/BHA composites demonstrated the designed performance of the mechanical properties and biotribological behavior.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 606-612"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60303-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88687408","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: 39

Degradation of microcystin-RR in water by chlorine dioxide 二氧化氯降解水中微囊藻毒素的研究

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60306-5

Ying JI, Jun-li HUANG, Jiao FU, Ming-song WU, Chong-wei CUI

{"title":"Degradation of microcystin-RR in water by chlorine dioxide","authors":"Ying JI, Jun-li HUANG, Jiao FU, Ming-song WU, Chong-wei CUI","doi":"10.1016/S1006-1266(08)60306-5","DOIUrl":"10.1016/S1006-1266(08)60306-5","url":null,"abstract":"<div><p>Due to the potent hepatotoxicity and tumor-promoting activity of microcystins, a successful removal of these toxins during drinking water treatment processes is of increasing concern. The oxidation kinetics of MC-RR by chlorine dioxide (ClO<sub>2</sub>) was studied with HPLC and characterization of the reaction products was performed with UV-spectrometry, TOC and LC-MS. Our experimental results show that the oxidation process is a second order overall and a first order with respect to ClO<sub>2</sub> and MC-RR. The activation energy of MC-RR degradation by ClO<sub>2</sub> is 53.07 kJ/mol. The rate constant <em>k</em> of the action can be increased by increasing temperature and decreasing pH value and ranged from 6.11×10<sup>2</sup> L/(mol·min) to 5.29×10<sup>2</sup> L/(mol·min) at pH from 3.44 to 10.41 at 10 °C. Reaction products were determined to be organic and volatile, because they could be almost removed from aqueous solution by heating for 15 min at 60 °C. In addition, the main oxidation products have <em>m</em>/<em>z</em> values of 1072 and are identified as di-hydroxy isomers of MC-RR.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 623-628"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60306-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73468065","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

Land subsidence induced by groundwater extraction and building damage level assessment — a case study of Datun, China 地下水开采诱发地面沉降及建筑物破坏程度评价——以大屯为例

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60293-X

Qi-yan FENG , Gang-jun LIU , Lei MENG , Er-jiang FU , Hai-rong ZHANG , Ke-fei ZHANG

{"title":"Land subsidence induced by groundwater extraction and building damage level assessment — a case study of Datun, China","authors":"Qi-yan FENG , Gang-jun LIU , Lei MENG , Er-jiang FU , Hai-rong ZHANG , Ke-fei ZHANG","doi":"10.1016/S1006-1266(08)60293-X","DOIUrl":"10.1016/S1006-1266(08)60293-X","url":null,"abstract":"<div><p>As in many parts of the world, long-term excessive extraction of groundwater has caused significant land-surface subsidence in the residential areas of Datun coal mining district in East China. The recorded maximum level of subsidence in the area since 1976 to 2006 is 863 mm, and the area with an accumulative subsidence more than 200 mm has reached 33.1 km<sup>2</sup> by the end of 2006. Over ten cases of building crack due to ground subsidence have already been observed. Spatial variation in ground subsidence often leads to a corresponding pattern of ground deformation. Buildings and underground infrastructures have been under a higher risk of damage in locations with greater differential ground deformation. Governmental guideline in China classifies building damages into four different levels, based on the observable measures such as the width of wall crack, the degree of door and window deformation, the degree of wall inclination and the degree of structural destruction. Building damage level (BDL) is estimated by means of ground deformation analysis in terms of variations in slope gradient and curvature. Ground deformation analysis in terms of variations in slope gradient has shown that the areas of BDL III and BDL II sites account for about 0.013 km<sup>2</sup> and 0.284 km<sup>2</sup> respectively in 2006, and the predicted areas of BDL (define this first) III and II sites will be about 0.029 km<sup>2</sup> and 0.423 km<sup>2</sup>respectively by 2010. The situation is getting worse as subsidence continues. That calls for effective strategies for subsidence mitigation and damage reduction, in terms of sustainable groundwater extraction, enhanced monitoring and the establishment of early warning systems.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 556-560"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60293-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75769950","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

Prospecting for coal in China with remote sensing 中国煤炭遥感勘探

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60290-4

Ke-long TAN , Yu-qing WAN , Sun-xin SUN , Gui-bao BAO , Jing-shui KUANG

{"title":"Prospecting for coal in China with remote sensing","authors":"Ke-long TAN , Yu-qing WAN , Sun-xin SUN , Gui-bao BAO , Jing-shui KUANG","doi":"10.1016/S1006-1266(08)60290-4","DOIUrl":"10.1016/S1006-1266(08)60290-4","url":null,"abstract":"<div><p>With the rapid development of China's economy, coal resources are increasingly in great demand. As a result, the remaining coal reserves diminish gradually with large-scale exploitation of coal resources. Easily-found mines which used to be identified from outcrops or were buried under shallow overburden are decreasing, especially in the prosperous eastern regions of China, which experience coal shortages. Currently the main targets of coal prospecting are concealed and unidentified underground coal bodies, making it more and more difficult for coal prospecting. It is therefore important to explore coal prospecting by taking advantage of modern remote sensing and geographic information system technologies. Given a theoretical basis for coal prospecting by remote sensing, we demonstrate the methodologies and existing problems systematically by summarizing past practices of coal prospecting with remote sensing. We propose a new theory of coal prospecting with remote sensing. In uncovered areas, coal resources can be prospected for by direct interpretation. In coal bearing strata of developed areas covered by thin Quaternary strata or vegetation, prospecting for coal can be carried out by indirect interpretation of geomorphology and vegetation. For deeply buried underground deposits, coal prospecting can rely on tectonic structures, interpretation and analysis of new tectonic clues and regularity of coal formation and preservation controlled by tectonic structures. By applying newly hyper-spectral, multi-polarization, multi-angle, multi-temporal and multi-resolution remote sensing data and carrying out integrated analysis of geographic attributes, ground attributes, geophysical exploration results, geochemical exploration results, geological drilling results and remote sensing data by GIS tools, coal geology resources and mineralogical regularities can be explored and coal resource information can be acquired with some confidence.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 537-545, 550"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S1006-1266(08)60290-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72587585","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: 7