The determination of frequency domain soil parameters of horizontally layered structure by using dipole‐dipole array

Li, Zhongxin; Rao, Shaowei

doi:10.1002/jnm.2578

Cited by 4 publications

(4 citation statements)

References 18 publications

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“…This particular configuration consists of two pairs of electrodes: a current electrode (transmitter) and a potential electrode (receiver dictates that the distance between the current and potential electrodes is maintained at an equal distance (spacing = a) with each distance being an integer multiple of "a" (J. O. Coker et al, 2020;Li & Rao, 2019). By utilizing this setup, the researchers were able to accurately measure the nature and spatial distribution of soil pipes with high precision and accuracy.…”

Section: Dipole-dipole Methodsmentioning

confidence: 99%

Investigating the Susceptibility of Tunnel Erosion in Southern Nigeria using Integrated Geophysical Methods

I.U.,

G.Z.

2023

African Journal of Environment and Natural Science Research

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There has been a growing incidence of soil subsidence in various regions of Anambra State, located in southern Nigeria. These subsidence events primarily stem from the formation of natural tunnels or soil pipes within the subsurface. To delve deeper into this issue, the present study employed two geophysical techniques, namely the Very Low Frequency Electromagnetic (VLF-EM) method and the Electric Resistivity Method utilizing the Dipole-Dipole array. These methods were utilized to investigate the characteristics and spatial distribution of soil pipes at two specific sites: Awka Site 1 and Awka Site 2, both situated within Anambra State, Nigeria. Four profiles with transverse lengths of 100 m and 5 m spacing were surveyed. On each profile, the inphase and outphase were collected using the Abem Wadi Meter after a confirmed connection to the external satellite, while nine dipole-dipole profiles were carried on the same location. Four profiles with transverse lengths of 100 m and 5 m spacing were surveyed (Figures 3 and 4). The data analysis from the VLF-EM survey reveals that a significant portion (80%) of the low conducting zones observed in the pseudosection originates from the top of the profile, indicating a downward trend in the formation of soil piping. The VLF-EM result also inferred that the subsurface voids in the study areas extend vertically downward up to 10 meters, with an average horizontal extension exceeding 0.5 meters. This highlights the extensive spatial reach of the subsurface voids and emphasizes their potential impact on the surrounding environment. The dipole-dipole survey conducted in the study area identified six distinct structures, with the eroded formation being particularly noteworthy. This structure, characterized by resistivity ranging from 1200–30000 Ωm, plays a significant role in creating favorable conditions for soil piping. Furthermore, the presence of strong dispersive soils increases the likelihood of soil piping occurrences within this structure.

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Section: Dipole-dipole Methodsmentioning

confidence: 99%

Investigating the Susceptibility of Tunnel Erosion in Southern Nigeria using Integrated Geophysical Methods

I.U.,

G.Z.

2023

African Journal of Environment and Natural Science Research

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“…This particular configuration consists of two pairs of electrodes: a current electrode (transmitter) and a potential electrode (receiver). A dipole is formed by setting two electrodes closely together at one end, and convention dictates that the distance between the current and potential electrodes is maintained at an equal distance (spacing = a) with each distance being an integer multiple of "a" (J. O. Coker et al, 2020; Li and Rao, 2019) [20,25] . By utilizing this setup, the researchers were able to accurately measure the nature and spatial distribution of soil pipes with high precision and accuracy.…”

Section: Dipole-dipole Methodsmentioning

confidence: 99%

Uncovering soil piping vulnerability using direct current geophysical techniques in Awka, Anambra State, Nigeria

IU,

2023

IJMRGE

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In recent times, there have been increasing reports of soil subsidence occurring in various parts of Anambra State, Nigeria. The formation of soil pipes in the subsurface, which has been reported by many researchers globally, is the chief cause of these subsidence incidents. Thus, this research aims to use Direct Current (DC) geophysical techniques to delineate the spatial distribution, pattern, and characteristics of these soil pipes at two sites: Awka Site 1 and Awka Site 2 both in Awka South LGA of Anambra state, Nigeria. Two electrodes array configurations - the dipole-dipole array for analyzing the Electrical Resistivity Tomography (ERT) and the Schlumberger array for analyzing the Vertical Electrical Sounding (VES) - were employed. Nine ERT profiles and eighteen soundings were carried out. The results from the ERT survey divided the subsurface into six distinct structures. The high-resistivity 3000-30000Ωm, the eroded structure with dry pore spaces, which mainly occur at the top of the profile, was interpreted as having the right conditions for the formation of soil pipes. The result from the VES survey revealed two to five different geo-electrical sections and fourteen distinctive sounding curves that are characterized by the vertical changes in the subsurface. The weathered soil with resistivity ranging from 1200-30000Ωm, which aggregates very close to the surface 0-5m of the study areas, was interpreted as having the best soil formations that allow the building of soil pipes. The 2D and 3D iso-resistivity maps obtained from the data of the VES show that soil pipes follow the NW-SE direction. This coincides with the stress direction, fluid migration paths, and sloppy terrains of the study areas.

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“…In order to show the performance of ant colony optimization algorithm in soil parameter inversion, we consider comparing it with other global optimization algorithms such as simulated annealing (SA), genetic algorithm (GA), and particle swarm optimization (PSO) which have been applied to soil inversion in other literatures. [11][12][13] From the perspective of global search capability and convergence efficiency, the comparison results are shown in Table 7. It can be clearly seen that ant colony optimization algorithm greatly improves the computational efficiency while ensuring to find the global optimal solution.…”

Section: Case Amentioning

confidence: 99%

“…Global optimization algorithms are increasingly applied to parameter inversion of multi‐layer soil models. In Reference 11, simulated annealing algorithm is adopted to the inversion of soil parameters in frequency domain, and is verified by synthetic data. Reference 12 compares genetic algorithm with simulated annealing in terms of parameter convergence.…”

Section: Introductionmentioning

confidence: 99%

Inversion of one‐dimensional parameters of horizontal multi‐layer soil model based on dynamic state electromagnetic field theory and ant colony optimization algorithm

Wang

2023

Int J Numerical Modelling

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Building a reliable soil model is a prerequisite for accurately calculating the ground potential distribution of the grounding grid. Research shows that the soil electrical parameters are frequency‐dependent, so frequency domain inversion of soil parameters should consider the soil inhomogeneity and the frequency characteristic of parameters. A method for retrieving parameters of horizontal multilayer soil model is proposed. The theoretical formula of apparent complex resistivity with considering dynamic state electromagnetic field theory is derived from Green's function. Discrete dynamic state complex image method is introduced to solve the infinite integral in Green's function. Ant colony optimization algorithm is applied to optimize the inversion process of soil parameters. In the first stage, applicability of this method is confirmed by interpreting field data under DC field. DC parameters including DC resistivity, thickness and number of layer are determined. The performance of different optimization algorithms in terms of computational efficiency is compared at this stage. In the second stage, soil resistivity and relative dielectric constant are retrieved by inverting frequency domain experimental data. Different representations based on quasi‐static electromagnetic field and dynamic state electromagnetic field theories are taken into account. The frequency characteristic of soil parameters is concluded by discussing the inversion results. In the study of parameter inversion of horizontal multi‐layer soil model, our method has shown strong performance in computational efficiency and accuracy of inversion results.

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The determination of frequency domain soil parameters of horizontally layered structure by using dipole‐dipole array

Cited by 4 publications

References 18 publications

Investigating the Susceptibility of Tunnel Erosion in Southern Nigeria using Integrated Geophysical Methods

Investigating the Susceptibility of Tunnel Erosion in Southern Nigeria using Integrated Geophysical Methods

Uncovering soil piping vulnerability using direct current geophysical techniques in Awka, Anambra State, Nigeria

Inversion of one‐dimensional parameters of horizontal multi‐layer soil model based on dynamic state electromagnetic field theory and ant colony optimization algorithm

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