As an important geophysical tool,high density electrical technique infers the underground geological structures by processing and inverting the apparent resistivity data.Currently,the false anomalies have been frequen...As an important geophysical tool,high density electrical technique infers the underground geological structures by processing and inverting the apparent resistivity data.Currently,the false anomalies have been frequently occurred in the graph of apparent resistivity pseudo-section or inverted geoelectrical section obtained from high-density electrical technique,and are difficult to remove.In this study,the authors explain the mechanism of the false anomalies and put forward the horizontal differential field method to identify the false anomalies.Based on the analysis of modeling results,this method is applied in the surveying data in Xinlei Quarry of Jiuquan,and the results confirm the effectiveness of the horizontal differential field method.展开更多
<div style="text-align:justify;"> Rainfall infiltration is a porous medium flow problem with variable saturation. Based on the theoretical analysis of the flow field, electrical conductivity of rocks, ...<div style="text-align:justify;"> Rainfall infiltration is a porous medium flow problem with variable saturation. Based on the theoretical analysis of the flow field, electrical conductivity of rocks, the electrical field, the paper simulates the coupling relationship between the water saturation in soil and the apparent resistivity distribution. It combines the Richards equation, the Archie formula and the Laplace equation. The experiment simulates the potential field data by the Wenner setting in electrical exploration on a two-layer geologic model with continuous rainfall during 5 days, which shows that the effective saturation in soil is increasing with the rainfall time, while the apparent resistivity is decreasing. This can provide a theoretical basis for the analyzing the rainfall infiltration and porosity of the soil by using high-density electrical method in the future. </div>展开更多
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 c...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.展开更多
The principles,methods,technologies and application effects of several electromagneticmethods for the detection of the hidden danger of water gushing at the coalface were introduced.Also,emphasis was laid on expoundin...The principles,methods,technologies and application effects of several electromagneticmethods for the detection of the hidden danger of water gushing at the coalface were introduced.Also,emphasis was laid on expounding the methods,principles andeffects of down-hole detections by electric transmission tomography and transient electromagneticmethod.The potential of point power supplied in the underground homogeneoussemi-space,as well as the response to a low-resistivity abnormal body in file hemogeneoussemi-space,was simulated by adopting 3-D finite element method to interpretthe basic theory of the electric transmission tomography.The results of actual measurementshow that the mine electromagnetic method is sensitive to water-bearinglow-resistivity bodies and can play a unique role in detecting the hidden danger of watergushing at the coal face.展开更多
某些垃圾填埋场由于相关资料严重缺失,给污染物的治理工作带来了困难。为了解决老垃圾填埋场的污染物治理问题,将高密度电法和探地雷达法相结合,对某村老垃圾填埋场进行了全方位探查,取得了以下成果:1)成功识别出垃圾与原位土层的界线,...某些垃圾填埋场由于相关资料严重缺失,给污染物的治理工作带来了困难。为了解决老垃圾填埋场的污染物治理问题,将高密度电法和探地雷达法相结合,对某村老垃圾填埋场进行了全方位探查,取得了以下成果:1)成功识别出垃圾与原位土层的界线,得到了垃圾层的范围和厚度,并以此为基础计算出回填方量为132454 m ^(3),为污染物的清除和治理提供了重要的参考;2)依据电阻率的分布,划分出填埋物的种类主要为建筑垃圾、生活垃圾或者粪便;3)识别出垃圾渗液的污染范围,圈定需要隔绝污染和回收清洁土壤的位置。本次研究结果为今后的垃圾治理工作提供了重要的参考。展开更多
文摘As an important geophysical tool,high density electrical technique infers the underground geological structures by processing and inverting the apparent resistivity data.Currently,the false anomalies have been frequently occurred in the graph of apparent resistivity pseudo-section or inverted geoelectrical section obtained from high-density electrical technique,and are difficult to remove.In this study,the authors explain the mechanism of the false anomalies and put forward the horizontal differential field method to identify the false anomalies.Based on the analysis of modeling results,this method is applied in the surveying data in Xinlei Quarry of Jiuquan,and the results confirm the effectiveness of the horizontal differential field method.
文摘<div style="text-align:justify;"> Rainfall infiltration is a porous medium flow problem with variable saturation. Based on the theoretical analysis of the flow field, electrical conductivity of rocks, the electrical field, the paper simulates the coupling relationship between the water saturation in soil and the apparent resistivity distribution. It combines the Richards equation, the Archie formula and the Laplace equation. The experiment simulates the potential field data by the Wenner setting in electrical exploration on a two-layer geologic model with continuous rainfall during 5 days, which shows that the effective saturation in soil is increasing with the rainfall time, while the apparent resistivity is decreasing. This can provide a theoretical basis for the analyzing the rainfall infiltration and porosity of the soil by using high-density electrical method in the future. </div>
基金supported by the Institute of Seismology Foundation, China Earthquake Administration (201326126)
文摘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.
基金Supported by the National Basic Research of China(2006CB202207)the National Natural Science Foundation of China(40674060)
文摘The principles,methods,technologies and application effects of several electromagneticmethods for the detection of the hidden danger of water gushing at the coalface were introduced.Also,emphasis was laid on expounding the methods,principles andeffects of down-hole detections by electric transmission tomography and transient electromagneticmethod.The potential of point power supplied in the underground homogeneoussemi-space,as well as the response to a low-resistivity abnormal body in file hemogeneoussemi-space,was simulated by adopting 3-D finite element method to interpretthe basic theory of the electric transmission tomography.The results of actual measurementshow that the mine electromagnetic method is sensitive to water-bearinglow-resistivity bodies and can play a unique role in detecting the hidden danger of watergushing at the coal face.
文摘某些垃圾填埋场由于相关资料严重缺失,给污染物的治理工作带来了困难。为了解决老垃圾填埋场的污染物治理问题,将高密度电法和探地雷达法相结合,对某村老垃圾填埋场进行了全方位探查,取得了以下成果:1)成功识别出垃圾与原位土层的界线,得到了垃圾层的范围和厚度,并以此为基础计算出回填方量为132454 m ^(3),为污染物的清除和治理提供了重要的参考;2)依据电阻率的分布,划分出填埋物的种类主要为建筑垃圾、生活垃圾或者粪便;3)识别出垃圾渗液的污染范围,圈定需要隔绝污染和回收清洁土壤的位置。本次研究结果为今后的垃圾治理工作提供了重要的参考。
