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Simulation research and application on response characteristics of detecting water-filled goaf by transient electromagnetic method

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International Journal of Coal Science & Technology 2022年第2期9卷 167-192页

作者： Tingye Qi Fan Zhang Xiaoming Pei Guorui Feng Huiru Wei College of Mining Engineering Taiyuan University of TechnologyTaiyuan 030024China Research Center of Green Mining Engineering Technology in Shanxi Province Taiyuan 030024China

Water inrush disasters poses a great threat to the safe exploitation of coal *** solve this problem,the transient electromagnetic method(TEM)was proposed to accurately detect the water accumulation in the *** electromagnetic response characteristics of diferent water-flled goaves were studied by electromagnetic feld theory,numerical simulation and feld *** the models of 100%water accumulation,50%water accumulation,0%water accumulation,100%water accumulation with collapsed rock,50%water accumulation with collapsed rock and 0%water accumulation with collapsed rock goaf,the characteristics of induced voltage attenuation curves were ***,the relationship between the attenuation voltage value and area of the transmitting coil,the depth of the goaf,the background resistivity,and the delay time were also *** results illustrate that the attenuation curve of induced voltage presented a regular exponential decay form in the 0%water accumulation model but existed abnormal exaltation for voltage in water-flled *** the linear ftting curve,it can be seen that the abnormal intensity of the induced voltage becomes stronger as the distance between the measuring point and the center of the target ***,the abnormal amplitude of the induced voltage increases with the rise of the water accumulation and collapsed rock will weakly reduce the low-resistivity anomalous efect on the water-accumulated *** addition,the response value of the attenuation voltage increased as the area of the transmitting coil increases,but decreased with increasing delay time and increasing background resistivity and depth of the target *** feld detection results of the Majiliang coal mine also confrmed the theoretical analysis and the numerical simulation.

关键词： transient electromagnetic method Water-accumulated goaf Forward and inverse simulation Attenuation curve of induced voltage

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Application of transient electromagnetic method with Multi-Radiation Field Sources in Deep Edge Mineral Resources Exploration

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Acta Geologica Sinica(English Edition) 2021年第S1期95卷 99-101页

作者： ZENG Youqiang ZENG Gaofu HUANG Lishan LI Xiu GUO Jianlei WANG Jianchao China Nonferrous Metal(Guilin)Geology and Mining Company Limited GuilinGuangxi 541004China School of Geology Engineering and Geomatics Chang’an UniversityXi’an 710000China Xi’an Research Institute of China Coal Technology&Engineering Group Xi’an 710077China

In recent years,in order to meet the practical needs of deep edge mine detection with large depth and high precision,transient electromagnetic method(TEM)near emission source detection mode has become an international... 详细信息

关键词： multiple radiation field sources exploration of deep mineral resources transient electromagnetic method

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Experiment in metal disturbance during advanced detection using a transient electromagnetic method in coal mines

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Mining Science and Technology 2010年第6期20卷 861-863页

作者： JIANG Zhihai YUE Jianhua YU Jingcun School of Resources and Geoscience China University of Mining & Technology Xuzhou 221008 China State Key Laboratory of Geomechanics and Deep Underground Engineering China University of Mining & Technology Xuzhou 221008 China

Tunneling machines, or excavators, are large and good conductors and affect the reliability of data gathering and interpretation in advanced detection using transient electromagnetic methods. In our experiment, we used a coincident-loop and central loop type of configuration, where the coil plane l） vertical to and 2） parallel to the working face. A SIROTEM instrument at different locations was used to observe the transient electromagnetic responses of the excavator and to analyze the response amplitudes. The result shows that the tunneling machine affects the advanced detection data and is related to the way the coil is coupled. When the excavator is 6 m from the observatory, the interference of tunneling machine can be ignored.

关键词： transient electromagnetic method advanced detection metal disturbance driving face

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Mapping coalmine goaf using transient electromagnetic method and high density resistivity method in Ordos City, China

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Geodesy and Geodynamics 2016年第5期7卷 340-347页

作者： Guiju Wu Guangliang Yang Hongbo Tan The Key Laboratory of Earthquake Geodesy Institute of Seismology China Earthquake Administration

The research about subsurface characteristics by using transient electromagnetic method（TEM） and high density resistivity method（HDRM） were already conducted in Ordos. The objective of this research is to detect coalmine goaf areas based on rock resistivity. The data processing using wavelet transform, three point smoothing, RES2 DINV and Maxwell processing software to obtain 2D resistivity structure. The results showed that the layers with maximum resistivity values（30e33 U m on Line 1, 30e31 U m on Line 2, 32e40 U m on Line3） are founded at station 1e7, and 14e20 on Line 1,13e18 on Line 2, and 8e13 and 16e20 on Line 3 which is predicted as goaf layer, and the minimum resistivity values（20e26 U m of TEM, 45e75 U m of HDRM） at the other layers. This resistivity difference was caused by the geology and characteristics of the study area which is located close by the cleugh with rich coal, so the goaf area distinguishable with aquifer layer and coal seam. The results were also significant accidents and serious destruction of ecological environment.

关键词： transient electromagnetic method High density resistivity method Coalmine goaf areas Geotechnical Electrical

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One-dimensional constrained inversion of electrical source transient electromagnetic method

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Earthquake Research Advances 2021年第S1期1卷 41-44页

作者： Guoru Nai Zhuoliang Xie Xianjie Chen Wei Liu School of Geophysics Chengdu University of TechnologyChengduSichuanChina

The damped least squares inversion principle is applied to the transient electromagnetic one-dimensional inversion of electrical sources,and a new model is obtained by continuously iterating the initial model,thereby fitting the observed transient electromagnetic response,and performing one-dimensional inversion through induced electromotive force *** this paper,in the damped least squares inversion,constraints are added to the Jacobian matrix,and simultaneous constraint equations and conventional inversion equations are *** weighting the constraint parameters,the difference between adjacent resistivities and layer thicknesses is ***,K-type and H-type theoretical models were used to verify the reliability of the algorithm,and compared with the conventional transient electromagnetic damping least squares inversion.

关键词： transient electromagnetic method Damped least squares Constrained inversion

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Cone-shaped source characteristics and inductance effect of transient electromagnetic method

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Applied Geophysics 2017年第1期14卷 165-174,192页

作者：杨海燕李锋平岳建华郭福生刘旭华张华东华理工大学省部共建核资源与环境国家重点实验室培育基地江西南昌330013 东华理工大学放射性地质与勘探技术国防重点学科实验室南昌330013 中国矿业大学资源与地球科学学院江苏徐州221116

Small multi-turn coil devices are used with the transient electromagnetic method （TEM） in areas with limited space, particularly in underground environments such as coal mines roadways and engineering tunnels, and for detecting shallow geological targets in environmental and engineering fields. However, the equipment involved has strong mutual inductance coupling, which causes a lengthy turn-off time and a deep “blind zone”. This study proposes a new transmitter device with a conical-shape source and derives the radius formula of each coil and the mutual inductance coefficient of the cone. According to primary field characteristics, results of the two fields created, calculation of the conical-shaped source in a uniform medium using theoretical analysis, and a comparison of the inductance of the new device with that of the multi-turn coil, show that inductance of the multi-turn coil is nine times greater than that of the conical source with the same equivalent magnetic moment of 926.1 A·m2. This indicates that the new source leads to a much shallower “blind zone.” Furthermore, increasing the bottom radius and turn of the cone creates a larger mutual inductance but increasing the cone height results in a lower mutual inductance. Using the superposition principle, the primary and secondary magnetic fields for a conical source in a homogeneous medium are calculated; results indicate that the magnetic behavior of the cone is the same as that of the multi-turn coils, but the transient responses of the secondary field and the total field are more stronger than those of the multi-turn coils. To study the transient response characteristics using a cone-shaped source in a layered earth, a numerical filtering algorithm is then developed using the fast Hankel transform and the improved cosine transform, again using the superposition principle. During development, an average apparent resistivity inverted from the induced electromotive force using each coil is defined to represe

关键词： transient electromagnetic method Cone-shaped source Apparent resistivity Mutual inductance “Smoke ring” inversion

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Discussion on the application prospect of the transient electromagnetic method based on the dual launcher and mine advanced detection

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World Journal of Condensed Matter Physics 2024年第1期14卷 21-33页

作者： Zhen Yang Huizhou Liu Shengqing Wang Yu Cao Ya Dong Chenghu Niu Weiwen Song Guoxin Xie State Grid Energy Hefeng Coal Power Co. Ltd. Tacheng Prefecture and Bukeseer County Xinjiang China Anhui Huizhou Geology Security Institute Co. Ltd. Hefei China

The dual transmitter implements the equivalent anti-magnetic flux transient electromagnetic method, which can effectively reduce the scope of the transient electromagnetic detection blind area. However, this method is rarely reported in the detection of pipelines in urban geophysical exploration and the application of coal mines. Based on this, this paper realizes the equivalent anti-magnetic flux transient electromagnetic method based on the dual launcher. The suppression effect of this method on the blind area is analyzed by physical simulation. And the detection experiment of underground pipelines is carried out outdoors. The results show that the dual launcher can significantly reduce the turn-off time, thereby effectively reducing the impact of the blind area on the detection results, and the pipeline detection results verify the device’s effectiveness. Finally, based on the ground experimental results, the application prospect of mine advanced detection is discussed. Compared with other detection fields, the formation of blind areas is mainly caused by the equipment. If the dual launcher can be used to reduce the blind area, the accuracy of advanced detection can be improved more effectively. The above research results are of great significance for improving the detection accuracy of the underground transient electromagnetic method.

关键词： A Dual Launcher Physical Simulation transient electromagnetic method Mine Geophysical Prospecting Detection Blind Area Application Prospect

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Forward simulation of coal fire model by transient electromagnetic method with electrical source

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Global Geology 2021年第4期24卷 239-248页

作者： ZENG Fanjie SONG Shuanlin WANG Zhejiang College of Geo-Exploration Science and Technology Jilin UniversityChangchun 130026China State Key Laboratory of Coal Mine Safety Technology Shenyang Research Institute of China Coal Technology&Engineering GroupShenyang 113122China

Uncontrolled coal fires are natural disasters that may cause mineral loss and environmental *** traditional loop source transient electromagnetic method can effectively detect the low-resistivity region of coal fires,but its detection efficiency is not so good for high-resistivity *** view of this limitation,a technique based on electrical source transient electromagnetics is proposed in this paper to detect high-resistivity regions in the spontaneous combustion process of *** the complex geometry of the coal fire area,an unstructured tetrahedral grid is used in this study to realize the spatial discretization of the model,and solve the electromagnetic field based on a vector finite element *** analysis is used to investigate methods for detecting coal fires and the characteristics of effective anomalies are further examined to provide guidance for practical detection.

关键词： electrical source transient electromagnetic method coal spontaneous combustion non-structural finite element algorithm

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transient electromagnetic detection method in water-sealed underground storage caverns

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Underground Space 2016年第1期1卷 44-61页

作者： Fang Lin Shougen Chen Guowei Ma MOE Key Laboratory of Transportation Tunnel Engineering Southwest Jiaotong UniversityChengdu 610031SichuanChina School of Civil Environmental and Mining EngineeringThe University of Western AustraliaPerth 6009Western AustraliaAustralia

Taking advantage of the water sensitivity of the transient electromagnetic method(TEM),this study assesses the effectiveness of the water curtain system for underground LPG storage caverns during the excavation *** also detects fracture water flow during the excavation process in light of the practice of two pilot large underground LPG storage caverns in *** maps of apparent resistivity derived from TEM measurements before and after water-filling during the excavation process have been discussed to improve the quality of the water curtain *** is the first case to apply TEM to detect the quality of the water curtain system during the construction of underground LPG storage cavern projects,and it is found to be practical,more visualized and worth popularizing.

关键词： LPG storage transient electromagnetic method Underground caverns Water curtain system Fracture flow

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Detection and monitoring of water-filled voids using transient electromagnetic method:a case study in Shanxi,China

Detection and monitoring of water-filled voids using transie...

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中国科学院地质与地球物理研究所2013年度（第13届）学术年会

作者： G.Q.Xue J.L.Cheng N.N.Zhou W.Y.Chen H.Li Key Laboratory of Mineral Resources Institute of Geology and GeophysicsChinese Academy of Sciences State Key Laboratory of Coal Resources & Safe Mining China University of Mining & Technology(Beijing)

Shanxi Province is a major coal base for the rapid development in China,but heavy production of coal resources has left abundant water-filled voids,creating significant geologic hazards around coal *** is necessary to quickly investigate the position and distribution of voids with effective geophysical *** feasibility of transient electromagnetic(TEM)method in detecting and monitoring water-filled voids is analyzed using 3D finite-element numerical simulation results as well as a case study in this *** case study was mainly to analyze and monitor the conditions around the site of a power transfer station under construction in the west of Shanxi province where many water-filled,minedout voids ***-loop TEM sounding was carried out three times from January 2010 to April 2011 around the building *** low resistivity abnormal area had been repeatedly located and the survey results showed that the area of voids increased with time,which indicated that the ground at the site was in an unstable and dangerous *** surveys provided more detailed geological information to the government for further safety arrangement and building re-design.

关键词： transient electromagnetic method Mined-out void Building stability Monitoring

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