Integration of 2D geoelectrical resistivity imaging and boreholes as rapid tools for geotechnical characterization of construction sites: A case study of New Akhmim city, Sohag, Egypt

Abudeif, A.M.; Mohammed, Mohammed A.; Fat-Helbary, R. E.; El-Khashab, H.M.; Masoud, Marwa M.

doi:10.1016/j.jafrearsci.2019.103734

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…ERT offers continuous profiling of the earth medium and characterisation of soil constituents, vadose zone, thicknesses of strata/overburden covers, bedrock topography and structures for sustainable groundwater exploitation (Daily et al 1991;Arora and Ahmed 2011;Arora et al 2016;Uhlemann et al 2017;Amaya et al 2018;Costall et al 2018;Hojat et al 2020;McLachlan et al 2020), as well as information about soil properties pertinent to engineering studies (Abu-Zied 1994;Ganerød et al 2006;Robineau et al 2007;Wisén et al 2008;Osazuwa and Chii 2009;Ngan-Tillard et al 2010;Maslakowski et al 2014;Mao et al 2015;Maurits et al 2017;Abudeifa et al 2019;Akingboye et al 2020), particularly in complex geological areas. The technique also plays important roles in geology and other large-scale site characterisation (Nguyen et al 2005;Dahlin et al 2007;Bery and Saad 2012;Binley et al 2015;Bernardinetti et al 2018;Dahlin and Loke 2018;Gourdol et al 2018;Mita et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Akingboye

Osazuwa

2021

NRIAG Journal of Astronomy and Geophysics

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Noninvasive geoelectrical subsurface characterisation provides screening of the earth medium to resolve complexity in subsurface geology caused by inhomogeneity of the overburden strata and bedrock architectures. The subsurface geological, hydrogeophysical and engineering conditions of Etioro-Akoko, southwestern Nigeria, were investigated using electrical resistivity tomography (ERT). This was aimed at unravelling the hydrogeodynamic and litho-structural complexity that are responsible for low groundwater yield in wells/boreholes and foundation failures. Field 2D resistivity data sets of the study area were inverted and used to produce geotomographic models for detailed insights into the complex subsurface geological setting. Results of the 2D resistivity inverted models showed three to four distinct layers; the topsoil, weathered layer, partially weathered/fractured bedrock and fresh bedrock. Bedrock structures occasioned by fracturing and deep weathering of the bedrock were delineated with resistivities and thicknesses ranging from 40 to 950 Ωm and 10-25 m, respectively. The fracture systems; F1, F2, F3, F4 and F5 in NW-SE, NNW-SSE, NE-SW and ENE-WSW orientations act as the major groundwater collecting centres in the area. The orientations and geometries of these geologic features are the manifestations of structural deformation of the underlying geology. Fourteen hand-dug well and four borehole points were proposed based on the ERT results. Conversely, the localised bedrock structures and oscillating bedrock topography were suggestive of potential threats to the foundations of engineering structures in the studied area. Reinforcement of concrete foundations at certain sites where ERT suggested that the underlying strata were not capable of bearing loads was recommended as well. This study has offered a detailed understanding of the subsurface geological disposition for sustainable groundwater development and siting of durable civil engineering structures in the studied area and other areas with typical complex geological settings.

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Section: Introductionmentioning

confidence: 99%

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Akingboye

Osazuwa

2021

NRIAG Journal of Astronomy and Geophysics

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“…(1) e layout of the borehole stations: as shown in Figure 9(a), a CHK7.2 (B) type rock borehole detector developed by Xuzhou Whitton Company was adopted [17][18][19]. During the observation, the list of the required instruments is provided in Table 7.…”

Section: Detection Scheme Of the Surrounding Rock Structurementioning

confidence: 99%

Research on the Deformation and Control Technology of Surrounding Rock in Entry Retaining along the Gob Side

Meng

Hui

et al. 2020

Advances in Civil Engineering

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This paper studies and introduces the successful case of gob-side entry retaining technology and the typical mining pressure law in Luan mining area, which is the main mining coal seam in Qinshui coalfield. Qinshui coalfield has an estimated coal reserve of 300 billion tons, accounting for 9.58% of the total national coal reserve in China, especially anthracite, chemical coal, and coking coal. The methods of field investigation, theoretical analysis, physical experiment, and industrial test are adopted. Through the field investigation, theoretical analysis, physical experiments, and industrial test, the following conclusions have been drawn in this study: (1) A thorough engineering geological investigation was conducted on the entry retaining along the gob side on noncoal pillar mining working face, which covers multiple periods of mining process including the roadway excavation period, primary mining period, primary mining stability period, and secondary mining influence period. A series of analysis and tests were conducted such as core sampling, rock mechanics property testing, borehole detection, and flexible formwork support evaluation, which laid a foundation for identifying the mining pressure law of gob-side entry retaining by using noncoal pillar mining. (2) The mining pressure law was studied through the collection of the field measurements taken from the entry retaining along the gob side on noncoal pillar mining working face. The keys to achieve the roadway surrounding rock stability through noncoal pillar mining are obtained. According to the study, the stability control of retained roadway surrounding rock mainly depends on the stability of top coal, coal side, and shoulder angle coal. (3) In this study, a roadway reinforcement scheme is proposed to improve the surrounding rock control technology for gob-side entry retaining by noncoal pillar mining, whose effectiveness has been verified by a series of industrial test. Therefore, the wide adoption of the noncoal pillar mining method in Number #3 coal mine can significantly relieve the predicament of coal pressing under a large number of buildings in Luan mining area, which provides insightful guidance to the coal-free pillar mining in the whole Luan mining area.

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“…Geotechnical investigations such as boring, drilling, Dutch cone penetrating test (CPT), standard penetrating test (SPT) and several laboratory tests (including Atterberg limits, moisture contents, quick undrained triaxial and Oedometer consolidation tests) are designed within a site to understand the engineering characteristics and bearing capacity of the subsurface geomaterials in the site [8]. The information from both geoelectrical and geotechnical investigations of subsurface geomaterials can be used to determine the kind of building design, foundation type, settlement rate and subsoil bearing capacity for a particular site prior to building construction work [9,10]. Therefore, the study is aimed at using a combination of geoelectrical resistivity survey and geotechnical investigation results to obtain a plausible interpretation of the lithology of the subsurface at shallow depths.…”

Section: Introductionmentioning

confidence: 99%

Geoelectrical and Geotechnical Investigations for Development of Superstructures at Nkpologwu Proposed Judiciary Site, Anambra Basin, Southeastern Nigeria

Egwuonwu

Okwonna

Okpala³

2022

PSIJ

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Geophysical and Geotechnical surveys were integrally carried out at a proposed Judiciary site for civil development of superstructures in Nkpologwu, Anambra Basin, Southeastern Nigeria. Nkpologwu falls within 7 ̊06̍ '40” E to 7 ̊08 ' 42” E longitudes and 5 ̊56' 76” N to 5 ̊57' 78” N latitudes at about 320 m above the mean sea level. The study is aimed at interpreting the lithology of the subsurface at shallow depths in order to accentuate the competence of soil formations at the foundation depths of the site. Vertical Electrical Sounding (VES) data were acquired in the geophysical survey while various geotechnical tests were carried out to ascertain the bearing capacity of the site’s subsoil. The registered data from the VES survey were processed with WINGLET software hence, geoelectric models of at least four layers were obtained. Characterized by apparent resistivity values in the range of about 1524 to 96,561 Ωm. Geotechnical results showed values of 10.4% to 12.4% OMC, 1.95 to 2.01g/cm3 MDD, 30.0 to 39.0% CBR, 21.0 to 30.5% particle size distribution, <12% PI and <35% LL Atterberg limit for soil samples within foundation depths at the site. Combined interpretation of the surveys showed that at foundation depths at the site were predominantly sand, laterite and sandstones delineated and these were found to meet the required standard of the Federal Ministry of works and housing for construction of superstructures. Therefore, the study provides the knowledge of the lithology and soil competence at foundation depths for future civil construction works at the site.

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Integration of 2D geoelectrical resistivity imaging and boreholes as rapid tools for geotechnical characterization of construction sites: A case study of New Akhmim city, Sohag, Egypt

Cited by 8 publications

References 23 publications

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Subsurface geological, hydrogeophysical and engineering characterisation of Etioro-Akoko, southwestern Nigeria, using electrical resistivity tomography

Research on the Deformation and Control Technology of Surrounding Rock in Entry Retaining along the Gob Side

Geoelectrical and Geotechnical Investigations for Development of Superstructures at Nkpologwu Proposed Judiciary Site, Anambra Basin, Southeastern Nigeria

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