2D resistivity imaging survey for siting water-supply tube wells in metamorphic terrains: A case study of CMRI campus, Dhanbad, India

2006 ◽  
Vol 25 (12) ◽  
pp. 1458-1460 ◽  
Author(s):  
K. K. K. Singh ◽  
Amarjeet K. Singh ◽  
K. B. Singh ◽  
A. Sinha
Keyword(s):  
Water Supply ◽  
Resistivity Imaging ◽  
Tube Wells ◽  
2D Resistivity Imaging ◽  
2D Resistivity ◽  
Supply Tube

An Attempt to Image Um El-Adam Cavity Structure in the Karst Terrain at Hit Area, Western Iraq

2020 ◽  
Vol 54 (1A) ◽  
pp. 44-54
Author(s):  
Ali Abed
Keyword(s):  
3D Model ◽  
3D Models ◽  
Electrode Spacing ◽  
Karst Terrain ◽  
Resistivity Imaging ◽  
Cavity Structure ◽  
2D Resistivity Imaging ◽  
2D And 3D ◽  
2D Resistivity

Um El-Adam cavity is one of the well-known cavities inside gypsum rocks in the Hit region, western Iraq, where this was chosen as a case study to evaluate 3D resistivity imaging technique detection and imaging of this type of cavity in complicated lithology. 3D view fulfilled by collating four 2D resistivity-imaging lines. The 2D resistivity imaging survey was carried out by Dipole-Dipole array with (n) factor and electrode spacing (a) of 6 and 2m, respectively. Both conventional inversion methods obtained the 2D and 3D models: standard least-squares and robust constrain options. The two options were able to define clearly the cave, but the second was more accurate, the dimensions of the cave in the inverse model closer to the actual dimensions. Horizontal slices displayed the final 3D model to reveal a 3D resistivity distribution with depth. The effect of Um El-Adam cavity appears after 1.5 m on the model slices, which is represented by increasing resistivity contrast compared to surrounding sediments. At the seventh and eighth slices, it was found that the size of the cavity exceeded compared with the actual dimensions. The results of this study indicated the high potential of this method for the detection and delineation of subterranean caves.

scholarly journals Exploration of Geotechnical Engineering Investigation under Complex Topographical and Geological Conditions

2019 ◽  
Vol 2 (4) ◽  
pp. 20
Author(s):  
Yan Gao ◽  
Guihe Liang ◽  
Yanyong Zhou
Keyword(s):  
Water Supply ◽  
Inner Mongolia ◽  
Geotechnical Engineering ◽  
Tube Wells ◽  
Geological Conditions ◽  
Engineering Investigation ◽  
Supply Tube

This paper will explore the geotechnical engineering investigation technology under the complex topographical and geological conditions, and introduce how to construct the water supply tube wells faster and better under the complex topographical and geological conditions by taking Inner Mongolia as an example, so as to provide reference for the relevant professionals

Optimisation of electrode arrays used in 2D resistivity imaging surveys

2007 ◽  
Vol 2007 (1) ◽  
pp. 1-4 ◽  
Author(s):  
M. H. Loke ◽  
Fouzan A. Alfouzan ◽  
M. N. M. Nawawi
Keyword(s):  
Electrode Arrays ◽  
Resistivity Imaging ◽  
2D Resistivity Imaging ◽  
2D Resistivity

scholarly journals Geophysical Assessment of Subsurface Conditions at Proposed Building Sites: Implications for Foundation Failure and Building Collapse

2018 ◽  
Vol 64 (3) ◽  
pp. 8-20
Author(s):  
Stephen Oluwafemi Ariyo ◽  
Julius Ogunmola Fatoba ◽  
Olateju O. Bayewu ◽  
Kamaldeen Olakunle Omosanya ◽  
Muhedeen Ajibola Lawal
Keyword(s):  
Geological Mapping ◽  
Geophysical Investigation ◽  
Building Collapse ◽  
Resistivity Imaging ◽  
Geotechnical Investigations ◽  
Weathered Layer ◽  
Electrical Sounding ◽  
2D Resistivity Imaging ◽  
2D Resistivity ◽  
Wenner Array

Abstract Building collapse has been a recurrent environmental hazard in Nigeria in the last two decades. This is a corollary of inadequate foundation investigation prior to construction, poor government policies, and general lack of awareness on the importance of geophysical and geotechnical investigations. In this study, geological mapping and detailed geophysical investigation using Electrical Resistivity Imaging (ERI) and Vertical Electrical Sounding (VES) were carried out to understand the suitability of proposed building sites at the main campus of the Olabisi Onabanjo University (OOU), Ago-Iwoye, Nigeria for construction. Both Wenner array and dipole-dipole were used for profiling and Schlumberger for sounding. Four transverses and VES were used in each of the three areas investigated. Our results show that the subsurface of the study areas is underlain by Precambrian basement rock of Nigeria. Rocks in the study area include banded gneiss, porphyroblastic gneiss, biotite-hornblende granite and quartzite schist. The sounding stations across the three areas and 2D resistivity imaging revealed three principal geoelectric layers, the topsoil, the weathered layer and the fractured/fresh basement with varied resistivity values for each layers. At the VES stations, the three geoelectric layers have resistivity values of 62 to 1182 Ωm, 3.2 to 1360Ωm and 87 to 4680 Ωm. On the 2D resistivity imaging profiles, the resistivity of the three layers varies from 2 to 1182 Ωm, 30to 1360 Ωm, and 40 to 2904 Ωm for the topsoil, the weathered basement, and fractured/fresh bedrock. Our work demonstrates that some of the proposed sites are structurally incompetent for engineering or foundation purposes. Excavation of the topsoil and reinforcement are required to sustain the proposed structures.

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