Journal of China University of Mining and Technology最新文献_第4页

Gas seepage equation of deep mined coal seams and its application 深部煤层瓦斯渗流方程及其应用

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60280-1

Guo-zhong HU, Hong-tu WANG, Hai-xiang TAN, Xiao-gang FAN, Zhi-gang YUAN

{"title":"Gas seepage equation of deep mined coal seams and its application","authors":"Guo-zhong HU, Hong-tu WANG, Hai-xiang TAN, Xiao-gang FAN, Zhi-gang YUAN","doi":"10.1016/S1006-1266(08)60280-1","DOIUrl":"10.1016/S1006-1266(08)60280-1","url":null,"abstract":"<div><p>In order to obtain a gas seepage law of deep mined coal seams, according to the properties of coalbed methane seepage in in-situ stress and geothermal temperature fields, the gas seepage equation of deep mined coal seams with the Klinkenberg effect was obtained by confirming the coalbed methane permeability in in-situ stress and geothermal temperature fields. Aimed at the condition in which the coal seams have or do not have an outcrop and outlet on the ground, the application of the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields on the gas pressure calculation of deep mined coal seams was investigated. The comparison between calculated and measured results indicates that the calculation method of gas pressure, based on the gas seepage equation of deep mined coal seams in in-situ stress and geothermal temperature fields can accurately be identical with the measured values and theoretically perfect the calculation method of gas pressure of deep mined coal seams.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 483-487"},"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)60280-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77262924","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: 16

Characteristics of a magnetic fluid seal and its motion in an axial variable seal gap 磁流体密封特性及其在轴向可变密封间隙中的运动

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60308-9

Ji-guo QIAN, Zhi-yi YANG

引用次数: 9

FEM analyses of stress and deformation of a flexible inner pressure bolt 柔性内压螺栓的应力与变形有限元分析

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60299-0

Zhong-he CHEN , Wei-qiang WANG , Le-wen ZHANG

{"title":"FEM analyses of stress and deformation of a flexible inner pressure bolt","authors":"Zhong-he CHEN , Wei-qiang WANG , Le-wen ZHANG","doi":"10.1016/S1006-1266(08)60299-0","DOIUrl":"10.1016/S1006-1266(08)60299-0","url":null,"abstract":"<div><p>The flexible inner pressure bolt is a new kind and new structural bolt (anchor rod). A number of structural improvements and performance test have been carried out. The bolt has superior compatibility to the soft crag and the large distortion tunnel with its flexibility. In order to study its stress, deformation and interaction mechanism thoroughly, a number of large distortion calculations and analyses have been carried out on the bolt by FEM (finite element method), especially with the ANSYS software, based on the updated Lagrangian law. The results show that the maximum stress of the inner wall of the bolt is consistent with an elastic analytic solution. The maximum stress on the body occurs in the vicinity of the enhancement material. The link enhancement of the body seems to be quite essential. The experimental results indicate that the maximum injection pressure in the bolt is 2.5 MPa without link enhancement and 8.3 MPa with the enhancement. This link enhancement effect is highly significant. These results provide some basis for the design, application and anchoring stress analysis of the bolt.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 584-587, 593"},"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)60299-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84886727","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

Quick determination of gas pressure before uncovering coal in cross-cuts and shafts 在横切和竖井开煤前快速测定瓦斯压力

Journal of China University of Mining and Technology Pub Date : 2008-12-01 DOI: 10.1016/S1006-1266(08)60282-5

Cheng-lin JIANG, Chen WANG, Xiao-wei LI, Yu-jia CHEN, Qing-xue XIE, Ying LIU, Jun TANG, Fei-long YANG, Fa-kai WANG, Su-hua DENG, Chaojie ZHANG, Song-li CHENG, Shu-wen LV

{"title":"Quick determination of gas pressure before uncovering coal in cross-cuts and shafts","authors":"Cheng-lin JIANG, Chen WANG, Xiao-wei LI, Yu-jia CHEN, Qing-xue XIE, Ying LIU, Jun TANG, Fei-long YANG, Fa-kai WANG, Su-hua DENG, Chaojie ZHANG, Song-li CHENG, Shu-wen LV","doi":"10.1016/S1006-1266(08)60282-5","DOIUrl":"https://doi.org/10.1016/S1006-1266(08)60282-5","url":null,"abstract":"<div><p>The determination of gas pressure before uncovering coal in cross-cuts and in shafts is one of the important steps in predicting coal and gas outbursts. However, the time spent for testing gas pressure is, at present, very long, seriously affecting the application of outburst prediction techniques in opening coal seams in cross-cuts and shafts. In order to reduce the time needed in gas pressure tests and to improve the accuracy of tests, we analyzed the process of gas pressure tests and examined the effect of the length of boreholes in coal seams in tests. The result shows that 1) the shorter the borehole, the easier the real pressure value of gas can be obtained and 2) the main factors affecting the time spent in gas pressure tests are the length of the borehole in coal seams, the gas emission time after the borehole has been formed and the quality of the borehole-sealing. The longer the length of the borehole, the longer the gas emission time and the larger the pressure-relief circle formed around the borehole, the longer the time needed for pressure tests. By controlling the length of the borehole in a test case in the Huainan mining area, and adopting a quick sealing technique using a sticky liquid method, the sealing quality was clearly improved and the gas emission time as well as the amount of gas discharged greatly decreased. Before the method described, the time required for the gas pressure to increase during the pressure test process, was more than 10 days. With our new method the required time is only 5 hours. In addition, the accuracy of the gas pressure test is greatly improved.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 4","pages":"Pages 494-499"},"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)60282-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91733413","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: 15

Research on fault mode and diagnosis of methane sensor 甲烷传感器故障模式与诊断研究

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60081-4

WANG Qi-jun , CHENG Jiu-long

引用次数: 8

Vacuum chamber suppression of gas-explosion propagation in a tunnel 真空室对隧道瓦斯爆炸传播的抑制

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60071-1

JIANG Shu-guang, WU Zheng-yan, LI Qing-hua, HE Xin-jian, SHAO Hao, QIN Jun-hui, WANG Lan-yun, HU Li-ming, LIN Bai-quan

引用次数: 22

Electro-rheological properties of montmorillonite particles coated with titania in methyl silicone oil 二氧化钛包覆蒙脱土颗粒在甲基硅油中的电流变特性

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60088-7

ZHANG Xu-ping, XU Ling-li, WANG Qing-liang

引用次数: 4

A management information system for mine railway transportation equipment 矿山铁路运输设备管理信息系统

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60078-4

LI Mei-yu , HAN Ke-qi , ZHANG Xiao-yong , LI Xiao-lin , ZHAI Yong-jun , YU Wei-hu

引用次数: 6

On the optimization of froth flotation by the use of an artificial neural network 基于人工神经网络的泡沫浮选优化研究

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60087-5

AL-THYABAT S

{"title":"On the optimization of froth flotation by the use of an artificial neural network","authors":"AL-THYABAT S","doi":"10.1016/S1006-1266(08)60087-5","DOIUrl":"10.1016/S1006-1266(08)60087-5","url":null,"abstract":"<div><p>A multi layered, feed forward Artificial Neural Network (ANN) was used to study the effect of feed mean size, collector dosage and impeller speed on flotation recovery and grade. The results of 30 flotation experiments conducted on Jordanian siliceous phosphate were used for training the network while another 10 experiments were used for validation. Simulation results showed that a four layer network with a [9 11 5 9 2] architecture was the one that gave the least mean squared error (MSE). Using this ANN to optimize the flotation process showed that the optimum flotation parameters were 321.28 μm for the feed mean size, 0.7354 kg/TOF for the collector dosage and 1225.25 RPM for the impeller speed. Studying the effect of these parameters on flotation recovery and grade was done by analysis of variance, ANOVA. The results showed that grade was more sensitive to changes in flotation parameters than was recovery. They also showed that changes in collector dosage had a more significant effect on flotation grade and recovery than did changes in feed mean size or impeller speed.</p></div>","PeriodicalId":15315,"journal":{"name":"Journal of China University of Mining and Technology","volume":"18 3","pages":"Pages 418-426"},"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)60087-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90300548","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: 47

Wear fault diagnosis of an emulsion pump crank bearing 乳化液泵曲柄轴承磨损故障诊断

Journal of China University of Mining and Technology Pub Date : 2008-09-01 DOI: 10.1016/S1006-1266(08)60097-8

HAN Xiao-ming , DU Chang-long , ZHANG Yong-zhong , TIE Zhan-xu

引用次数: 6