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Experimental analysis on bolt interference during advanced water detection with the mine transient electromagnetic method 被引量:2
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作者 Xiong-Wu HU Ping-Song ZHANG +1 位作者 Jia-Ping YAN Pei-Gen LI 《Journal of Coal Science & Engineering(China)》 2013年第3期407-413,共7页
During advanced water detection using the transient electromagnetic method, the exploration effect for water-rich area is often poor due to the interference of bolts that are distributed in different positions in work... During advanced water detection using the transient electromagnetic method, the exploration effect for water-rich area is often poor due to the interference of bolts that are distributed in different positions in working face. Thus, the study on the interference characteristics of bolts in different states has important directive significance for improving the acquisition quality and data processing method in water detection. Based on the analysis of the distribution laws of magnetic field excited by small multi-turn coincident loop in full space of homogeneity, the test on the interference of bolts has been designed in the mine. Through drilling 18 holes around the overlapping coil in the working face, mass data are collected in order with the posi- tion change and the exposed bolt length. The results of comprehensive data analysis show that the transient electromagnetic field is strongly interfered as the distance between the bolt and the center of the coil is less than 3 m, and the interference varies greatly as the distance varies. On the other hand, the field induced by the bolts can be ignored as the distance exceeds 3 m. The findings can help to improve data acquisition and correction during advanced water detection when using the transient electromagnetic method. 展开更多
关键词 mine transient electromagnet advanced detection mine testing ground bolt interference attribute
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Prediction Technology of Buried Water-Bearing Structures in Coal Mines Using Transient Electromagnetic Method 被引量:21
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作者 JIANG Zhi-hai YUE Jian-hua LIU Shu-cai 《Journal of China University of Mining and Technology》 EI 2007年第2期164-167,共4页
Buried water-conducting and water-bearing structures in front of the driving head may easily lead to water bursts in coal mines. Therefore,it is very important for the safety of production to make an accurate and time... Buried water-conducting and water-bearing structures in front of the driving head may easily lead to water bursts in coal mines. Therefore,it is very important for the safety of production to make an accurate and timely forecast about water bursts. Based on the smoke ring effect of transient electromagnetic fields,the principle of transient electro-magnetic method used in detecting buried water-bearing structures in coal mines in advance,is discussed. Small multi-turn loop configurations used in coal mines are proposed and a field procedure of semicircular sector scanning is presented. The application of this method in one coal mine indicates that the technology has many advantages compared with others. The method is inexpensive,highly accurate and efficient. Suggestions are presented for future solutions to some remaining problems. 展开更多
关键词 mine transient electromagnetic method advance detection water-bearing structure small multi-turn loop sector scanning
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Research on application of transient electromagnetic technology in coal mine 被引量:3
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作者 王玉和 李伟 程久龙 《Journal of Coal Science & Engineering(China)》 2007年第3期310-313,共4页
Studied the principle of transient electromagnetic method in coalmine and solved the computation of the whole time apparent resistivity and the relation between apparent resistivity and exploration depth and so on. St... Studied the principle of transient electromagnetic method in coalmine and solved the computation of the whole time apparent resistivity and the relation between apparent resistivity and exploration depth and so on. Studied the work method of transient electromagnetic method in coalmine and obtained reasonable arrangement way. Studied data processing and explanation method of transient electromagnetic method and obtained high quality electric section. Finally the purpose to detect water-bearing body and water-bearing structure in front of roadway in advance, and detect the water-bearing property of the roof and floor rock layer of coal face were realized by use of transient electromagnetic method. 展开更多
关键词 mine transient electromagnetic method whole time apparent resistivity roadway advanced detection the roof and floor of coalface water-bearing property detection
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Three-dimensional numerical modeling of fullspace transient electromagnetic responses of water in goaf 被引量:21
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作者 Chang Jiang-Hao Yu Jing-Cun. Liu Zhi-Xin 《Applied Geophysics》 SCIE CSCD 2016年第3期539-552,581,582,共16页
The full-space transient electromagnetic response of water-filled goaves in coal mines were numerically modeled. Traditional numerical modeling methods cannot be used to simulate the underground full-space transient e... The full-space transient electromagnetic response of water-filled goaves in coal mines were numerically modeled. Traditional numerical modeling methods cannot be used to simulate the underground full-space transient electromagnetic field. We used multiple transmitting loops instead of the traditional single transmitting loop to load the transmitting loop into Cartesian grids. We improved the method for calculating the z-component of the magnetic field based on the characteristics of full space. Then, we established the full- space 3D geoelectrical model using geological data for coalmines. In addition, the transient electromagnetic responses of water-filled goaves of variable shape at different locations were simulated by using the finite-difference time-domain (FDTD) method. Moreover, we evaluated the apparent resistivity results. The numerical modeling results suggested that the resistivity differences between the coal seam and its roof and floor greatly affect the distribution of apparent resistivity, resulting in nearly circular contours with the roadway head at the center. The actual distribution of apparent resistivity for different geoelectrical models of water in goaves was consistent with the models. However, when the goal water was located in one side, a false low-resistivity anomaly would appear on the other side owing to the full-space effect but the response was much weaker. Finally, the modeling results were subsequently confirmed by drilling, suggesting that the proposed method was effective. 展开更多
关键词 GOAF WATER mine transient electromagnetic method fullspace finite-difference time-domain method
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Detection technology and application of electromagnetic method for hidden danger of water gushing at coal face 被引量:2
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作者 SHI Xian-xin YAN Shu +1 位作者 CHEN Ming-sheng FU Jun-mei 《Journal of Coal Science & Engineering(China)》 2009年第2期197-205,共9页
The principles, methods, technologies and application effects of several electromagnetic methods for the detection of the hidden danger of water gushing at the coal face were introduced. Also, emphasis was laid on exp... The principles, methods, technologies and application effects of several electromagnetic methods for the detection of the hidden danger of water gushing at the coal face were introduced. Also, emphasis was laid on expounding the methods, principles and effects of down-hole detections by electric transmission tomography and transient electromagnetic method. The potential of point power supplied in the underground homogeneous semi-space, as well as the response to a low-resistivity abnormal body in the homogeneous semi-space, was simulated by adopting 3-D finite element method to interpret the basic theory of the electric transmission tomography. The results of actual measurement show that the mine electromagnetic method is sensitive to water-bearing low-resistivity bodies and can play a unique role in detecting the hidden danger of water gushing at the coal face. 展开更多
关键词 hidden trouble of water gushing electric transmission tomography mine transient electromagnetic method coal face high-density resistivity method 3-D finite element simulation
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