Journal of Environmental and Engineering Geophysics最新文献_第10页

A Study on the Characteristics of Electromagnetic Radiation during Deformation and Failure of Different Materials Under Uniaxial Compression 不同材料单轴压缩变形破坏过程中的电磁辐射特性研究

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/JEEG19-044

Qifei Wang, Chengwu Li, Beijing Xie, Yuechao Zhao, Dihao Ai

{"title":"A Study on the Characteristics of Electromagnetic Radiation during Deformation and Failure of Different Materials Under Uniaxial Compression","authors":"Qifei Wang, Chengwu Li, Beijing Xie, Yuechao Zhao, Dihao Ai","doi":"10.2113/JEEG19-044","DOIUrl":"https://doi.org/10.2113/JEEG19-044","url":null,"abstract":"The detection of electromagnetic radiation (EMR) during the fracture of solid materials such as rocks and coal has been widely used in seismic exploration and mine dynamic disaster prediction. As described in this paper, we conduct uniaxial compression tests on coal, cement, and glass materials to determine the characteristic EMR differences among materials. A band-stop filter based on the Fourier transform and the wavelet packet transform method are used to conduct signal denoising and analysis. Basic analyses of the pulse-time characteristics, energy distribution, cumulative energy, and waveform characteristics of EMR are conducted. The research results show that there is a strong corresponding relation between the loading time, loading stress and EMR energy. A large number of EMR events are released in rapid succession during the main rupture of coal and cement, while the EMR events are evenly distributed throughout the whole loading process of glass. For the same material, the maximum EMR amplitude increases with an increasing peak value of the stress. The EMR pulse waveform of coal and cement agrees well with predictions based on the theoretical formula of the electromagnetic dipole oscillation EMR generation mechanism. The paper provides further theoretical basis for understanding the mechanism of EMR, with great significance for improving coal mining safety.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"59 1","pages":"139-152"},"PeriodicalIF":1.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89829912","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

A Weighting Function-Based Method for Resistivity Inversion in Subsurface Investigations 基于加权函数的地下电阻率反演方法

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/jeeg19-029

Nie Lichao, Ma Zhao, Bin Liu, Xu Zhenhao, Zhou Wei, Wang Chengkun, J. Shao, Yin Xin

{"title":"A Weighting Function-Based Method for Resistivity Inversion in Subsurface Investigations","authors":"Nie Lichao, Ma Zhao, Bin Liu, Xu Zhenhao, Zhou Wei, Wang Chengkun, J. Shao, Yin Xin","doi":"10.2113/jeeg19-029","DOIUrl":"https://doi.org/10.2113/jeeg19-029","url":null,"abstract":"There is a high demand for high detection accuracy and resolution with respect to anomalous bodies due to the increased development of underground spaces. This study focused on the weighted inversion of observed data from individual array type electrical resistivity tomography (ERT), and developed an improved method of applying a data weighing function to the geoelectrical inversion procedure. In this method, the weighting factor as an observed data weighting term was introduced into the objective function. For individual arrays, the sensitivity decreases with increasing electrode interval. Therefore, the Jacobian matrices were computed for the observed data of individual arrays to determine the value of the weighting factor, and the weighting factor was calculated automatically during inversion. In this work, 2D combined inversion of ERT data from four-electrode Alfa-type arrays is examined. The effectiveness of the weighted inversion method was demonstrated using various synthetic and real data examples. The results indicated that the inversion method based on observed data weighted function could improve the contribution of observed data with depth information to the objective function. It has been proven that the combined weighted inversion method could be a feasible tool for improving the accuracies of positioning and resolution while imaging deep anomalous bodies in the subsurface.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"2677 1","pages":"129-138"},"PeriodicalIF":1.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90590633","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Using an Azimuth Electromagnetic Wave Imaging Method to Detect and Characterize Coal-seam Interfaces and Low-resistivity Anomalies 用方位角电磁波成像方法探测和表征煤层界面及低阻异常

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/JEEG19-041

Gang Chen, Yiren Fan, Quanxin Li

{"title":"Using an Azimuth Electromagnetic Wave Imaging Method to Detect and Characterize Coal-seam Interfaces and Low-resistivity Anomalies","authors":"Gang Chen, Yiren Fan, Quanxin Li","doi":"10.2113/JEEG19-041","DOIUrl":"https://doi.org/10.2113/JEEG19-041","url":null,"abstract":"It has been found that the traditionally used electromagnetic wave instruments have limitations in detection depths, as well as a lack of directionality. Therefore, those types of instruments cannot meet the needs of geo-steering applications. However, azimuth electromagnetic wave instruments have shown the ability to quickly acquire effective geo-steering information using a tilt coil design method, which can potentially provide accurate guidance for decision-making in drilling direction adjustments. In this study, a design method for an azimuth electromagnetic wave detection instrument for underground coal mining was proposed. The relationships between the structural parameters of the instrument and installation angles of the coils and the response signals were obtained in this study using simulations. Then, by choosing reasonable instrument spacings, coil installation angles, and transmitting frequencies, the detection performances of the instrument were successfully improved. Also, the basic parameter selections of the proposed logging-while-drilling azimuth electromagnetic wave logging instrument were determined to be suitable for underground coal-mining purposes. It was also found that the symmetric compensation of the instrument was sensitive to the interface responses, and the anti-symmetric compensation was sensitive to the anisotropic responses. In addition, a method of detecting the interface positions and azimuth of coal-seam interfaces using azimuth electromagnetic waves, as well as the potential for the application of the instrument for the detection of low-resistivity anomalies in coal goafs, were effectively demonstrated. The results of this study provided theoretical references for future coal-seam boundary detections and explorations, and also added insight into the development processes of coal-seam bedding.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"33 1","pages":"75-87"},"PeriodicalIF":1.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89298038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Joint Inversion of Magnetotelluric Impedance and Tipper Data in 3D Axial Anisotropic Media 三维轴向各向异性介质中大地电磁阻抗和倾斜数据联合反演

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/JEEG19-022

Wei Luo, Kunpeng Wang, Hui Cao, Changsheng Duan, Tao Wang, Xingxiang Jian

引用次数: 1

Ground Penetrating Radar Attenuation Expressions in Shallow Groundwater Research 浅层地下水探地雷达衰减表达式研究

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/JEEG19-039

M. C. Paz, F. Alcalá, L. Ribeiro

{"title":"Ground Penetrating Radar Attenuation Expressions in Shallow Groundwater Research","authors":"M. C. Paz, F. Alcalá, L. Ribeiro","doi":"10.2113/JEEG19-039","DOIUrl":"https://doi.org/10.2113/JEEG19-039","url":null,"abstract":"The electromagnetic-wave attenuation coefficient determines the overall resolution and effective penetration depth of ground penetrating radar (GPR) surveys. Despite this relevance to the design of proper GPR surveys, the attenuation expressions are rarely used in the applied shallow groundwater research (SGR) literature. This work examines the status of the attenuation expressions in SGR. For this, 73 GPR case studies (in 47 papers), including some information concerning the attenuation variables and parameters, were selected to build a database. From these, 18 cases (in 10 papers) provided attenuation expressions and only 11 cases (in 4 papers) used those expressions. Two types of expressions were identified, physically based global ones that try to solve a broad (but not complete) range of environmental and field technical conditions, and non-global ones adapted for specific geological environments and resolution needed. The database analysis showed that both global and non-global expressions were used exclusively in low-loss media to report an attenuation range of 0.1–21.5 dB m−1 by using common antenna frequencies in the 25–900 MHz range. The range of the attenuation expressions validity in SGR is biased because no surveys in variable-loss heterogeneous media and wider antenna frequency intervals could be compiled. The attenuation database generated seeks to improve the design of GPR surveys in SGR.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"25 1","pages":"153-160"},"PeriodicalIF":1.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87688143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

A Theoretical Study of Underground Magnetic Resonance Sounding for the Advanced Detection of Water Influxes in Tunnels 地下磁共振测深超前探测隧道涌水的理论研究

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/JEEG19-021

Yue Zhao, Jun Lin, Chuandong Jiang, Xiaofeng Yi

{"title":"A Theoretical Study of Underground Magnetic Resonance Sounding for the Advanced Detection of Water Influxes in Tunnels","authors":"Yue Zhao, Jun Lin, Chuandong Jiang, Xiaofeng Yi","doi":"10.2113/JEEG19-021","DOIUrl":"https://doi.org/10.2113/JEEG19-021","url":null,"abstract":"Based on surface magnetic resonance sounding (MRS), a relationship is proposed to express the MRS response signal with a vertical coil for the MRS method for a whole underground space model. Firstly, the declination and inclination characteristics of the Earth's magnetic field and the coil normal angle are studied by deriving the angle rotation matrix. Surprisingly, the results indicate that the MRS signal can be effectively improved by changing the normal direction of the coil perpendicular to that of the Earth's magnetic field. The advanced detection distance of the underground MRS method is closely related to the exciting pulse moment and the receiving sensitivity. Hence, a larger pulse moment and high receiving sensitivity correspond to a longer advanced detection distance. However, the limited transmitting moment will reduce the advanced detection distance. In the research coincident loop with the coil 2 m by 2 m square is employed. In order to overcome the noises with 1 nV and 100 nV level, the turns of loop should be 100 turns and 400 turns, respectively. Finally, the numerical simulation results verify the feasibility of underground whole MRS theory and resolution analysis method for the advanced detection of water-inrush disasters in mines and tunnels.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"25 1","pages":"37-46"},"PeriodicalIF":1.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81127730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Site Characterization of Soil-rock Mixture Sedimentary Stratum Based on HVSR Analysis in the Chinese Loess Plateau 基于HVSR分析的中国黄土高原土石混合沉积层场地特征

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/JEEG19-060

Ruyun Tian, Ma Liwei, Xiaohua Zhou, Wang Junqiu, Jun Lin, Dong-sheng Li

{"title":"Site Characterization of Soil-rock Mixture Sedimentary Stratum Based on HVSR Analysis in the Chinese Loess Plateau","authors":"Ruyun Tian, Ma Liwei, Xiaohua Zhou, Wang Junqiu, Jun Lin, Dong-sheng Li","doi":"10.2113/JEEG19-060","DOIUrl":"https://doi.org/10.2113/JEEG19-060","url":null,"abstract":"The soil-rock mixture sedimentary stratum is a compound with complex and loose topography, of which the structure is difficult to detect by the ordinary geophysical method. There is a need for a convenient, efficient and effective geophysical method to detect site effects in this area. This paper is an application of the S wave velocity profile inversion for the soil-rock mixture sedimentary stratum, using HVSR (Horizontal to Vertical Spectral Ratio) analysis of ambient noise by some three-component observations in the Chinese Loess Plateau. We carried out the measurement using three nested circular arrays and data recording systems with a spectrum expansion circuit. Inversion of the HVSR curves was performed by a three-layer model. Results of geological observation reveal that the upper part of the sedimentary stratum is Quaternary strata containing a large amount of humus and loess, the middle layer part is the stratum of the loose gravel and the under part is completely weathered granite with homogeneous lithology and fewer rocks. Interpretation results are consistent with previous drilling data, providing a valid geophysical basis for evaluating the stability of the soil erosion and designing a reasonable water and soil erosion control scheme.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"13 1","pages":"101-109"},"PeriodicalIF":1.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79224115","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

2D High-Resolution Crosswell Seismic Traveltime Tomography 二维高分辨率井间地震走时层析成像

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2020-03-01 DOI: 10.2113/JEEG19-003

Chuan Li, Jianxin Liu, Jianping Liao, Jianping Liao, A. Hursthouse

{"title":"2D High-Resolution Crosswell Seismic Traveltime Tomography","authors":"Chuan Li, Jianxin Liu, Jianping Liao, Jianping Liao, A. Hursthouse","doi":"10.2113/JEEG19-003","DOIUrl":"https://doi.org/10.2113/JEEG19-003","url":null,"abstract":"This paper presents a method for combining the hybrid eikonal solver and the prior velocity information to obtain high-resolution crosswell imaging. The hybrid eikonal solver in this technique can ensure rapid and reliable forward modeling of traveltime field in an unsmoothed velocity model. We also utilize the sonic well logging curve to properly develop an initial reference velocity model, and use the sonic well logging data as the prior information for the inversion part, which can restrict the problem of non-uniqueness. The results of the numerical experiment of traveltime in multi-layer media showed that the hybrid eikonal solver was more accurate than the finite difference method. The case study of an oil field in eastern China demonstrated that our method can derive a high-resolution reconstruction of the subsurface structure by inverting the primary traveltime datasets. These results suggest that even though the eikonal equation is a high frequency approximation to the wavefield, the hybrid eikonal solver can provide an accurate traveltime field in the forward modelling step of seismic crosswell tomography, which is critical to ensure high-resolution invert imaging in a highly heterogeneous environment.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"31 1","pages":"47-53"},"PeriodicalIF":1.0,"publicationDate":"2020-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84146791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Introduction to the JEEG Special Issue on Geophysics for Urban Underground Space Studies JEEG《城市地下空间地球物理学研究》特刊简介

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2019-12-23 DOI: 10.2113/JEEG24.4.V

Lanbo Liu, R. Qian

引用次数: 0

Integrated ERT, Seismic, and Electrical Resistivity Imaging for Geological Prospecting on Metro Line R3 in Qingdao, China 青岛地铁R3线ERT、地震、电阻率综合地质勘探

IF 1 4区工程技术

Journal of Environmental and Engineering Geophysics Pub Date : 2019-12-23 DOI: 10.2113/JEEG24.04.537

Nie Lichao, Ma Zhao, Wang Chengkun, Rentai Liu, Liu Zhengyu, Zhou Wei, Jian Li, S. Ju

{"title":"Integrated ERT, Seismic, and Electrical Resistivity Imaging for Geological Prospecting on Metro Line R3 in Qingdao, China","authors":"Nie Lichao, Ma Zhao, Wang Chengkun, Rentai Liu, Liu Zhengyu, Zhou Wei, Jian Li, S. Ju","doi":"10.2113/JEEG24.04.537","DOIUrl":"https://doi.org/10.2113/JEEG24.04.537","url":null,"abstract":"Metros are mass rapid-transit systems that have helped solve commuting problems for residents of metropolises throughout the world. However, adverse geological structures, leading to problem such as water inrush and mud gushing, pose a major threat to metro construction. Geophysical survey techniques provide quick and relatively inexpensive ways to detect adverse geological structures ahead of the tunnel face. Left line of the R3 metro tunnel in Qingdao, China will pass an aquifer sand layer under the Wolong River. To map the geological conditions below the river, we proposed a comprehensive prospecting method that would combine the merits of surface electrical resistivity imaging (S-ERT), seismic ahead prospecting, and tunnel-face and borehole electrical resistivity imaging (TBERI). The prospecting scheme was effectively revealed in a numerical model analysis, in which the stratum distribution was reconstructed using S-ERT. Field tests validated the synthetic results. The ahead prospecting scheme was able to reconstruct the distribution of an aquifer sand layer. Based on the results obtained, we believe that, the proposed scheme could play an important role in metro tunnel construction.","PeriodicalId":15748,"journal":{"name":"Journal of Environmental and Engineering Geophysics","volume":"87 1","pages":"537-547"},"PeriodicalIF":1.0,"publicationDate":"2019-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90838451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4