Surface and subsurface analysis based on the geological structure and electrical resistivity Data in Gorontalo Outer Ring Road (GORR), Huidu Utara

AbstractIn deep tunnels with hydro-geological conditions, it is paramount to investigate the geological structure of the region before excavating a tunnel; otherwise, unanticipated accidents may cause serious damage and delay the project. The purpose of this study is to investigate the geological properties ahead of a tunnel face using electrical resistivity tomography (ERT) and tunnel seismic prediction (TSP) methods. During construction of the Nosoud Tunnel located in western Iran, ERT and TSP 303 methods were employed to predict geological conditions ahead of the tunnel face. In this article, the results of applying these methods are discussed. In this case, we have compared the results of the ERT method with those of the TSP 303 method. This work utilizes seismic methods and electrical tomography as two geophysical techniques are able to detect rock properties ahead of a tunnel face. This study shows that although the results of these two methods are in good agreement with each other, the results of TSP 303 are more accurate and higher quality. Also, we believe that using another geophysical method, in addition to TSP 303, could be helpful in making decisions in support of excavation, especially in complicated geological conditions.

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Safety Indicators for Heterogeneous Non Lane Based Traffic-A Case Study at Outer Ring Road-Delhi

Indian Journal of Science and Technology ◽

10.17485/ijst/2018/v11i10/103552 ◽

2018 ◽

Vol 11 (10) ◽

pp. 1-11

Author(s):

M. Bhargav Naidu ◽

Rishi Singh Chhabra ◽

◽

Keyword(s):

Outer Ring ◽

Ring Road ◽

Lane Based

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Concentration Measurement of Lithium Bromide Aqueous Solution by Electrical Resistivity

Volume 5: Energy Systems Analysis, Thermodynamics and Sustainability; NanoEngineering for Energy; Engineering to Address Climate Change, Parts A and B ◽

10.1115/imece2010-37350 ◽

2010 ◽

Author(s):

Jian Sun ◽

Lin Fu ◽

Shigang Zhang ◽

Wei Hou

Keyword(s):

Aqueous Solution ◽

Electrical Resistivity ◽

Lithium Bromide ◽

Measurement Methods ◽

Concentration Measurement ◽

Low Grade ◽

Saving Energy ◽

Resistivity Data ◽

Absorption Chillers ◽

Low Grade Heat

Absorption chillers have currently become an important device in saving energy because of its effectiveness in utilizing low grade heat. Lithium bromide is widely used as absorbent in this system. But there were few outstanding concentration measurement methods in practice before. In this paper, complete electrical resistivity data of lithium bromide aqueous solution for concentration measurement was given. The electrical resistivity of lithium bromide aqueous solution was measured at concentrations of 35–70 wt% of lithium bromide and temperatures of 10–100°C. Results of this work can meet the requirement of concentration measurement of lithium bromide in absorption chillers without extracting samples.

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CONTRIBUTION OF DEEP ELECTRICAL RESISTIVITY TOMOGRAPHY TECHNIQUE TO HYDROGEOLOGICAL STUDIES: CASES FROM AREAS IN KAVALA (NORTH GREECE)

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.11387 ◽

2017 ◽

Vol 43 (4) ◽

pp. 1962

Author(s):

G. Vargemezis ◽

P. Tsourlos ◽

I. Mertzanides

Keyword(s):

Electrical Resistivity ◽

Electrical Resistivity Tomography ◽

Geological Structure ◽

Resistivity Tomography ◽

Near Surface ◽

Resistivity Method ◽

Area Of Interest ◽

Vertical Electric Sounding ◽

Hydrogeological Studies ◽

2D And 3D

The most common geophysical method widely used in hydrogeological surveys concerning deep investigations (150-300m of depth) is the resistivity method and particularly the Vertical Electric Sounding (VES) using the Schlumberger array. VES interpretations assume 1D geoelectrical structure yet it is obvious that such an interpretation assumption is not valid in many cases where 2D and 3D geological features exist. In such cases the application of geoelectrical techniques which can provide both vertical and lateral information concerning the resistivity variations is required. Techniques such as the electrical resistivity tomography, mostly used for the 2D and 3D geoelectrical mapping of near surface applications can be adapted to be used for larger investigation depths provided that modified equipment (viz. cables) is used. In the present paper, the application of deep electrical resistivity tomography (ERT) techniques is applied. ERT array of 21 electrodes, at a distance of 50 meters between them (total length 1000 meters) has been used in several studied areas located in the prefecture of Kavala (North Greece). In several cases near surface structure has been compared with VLF data. The aim of the survey was to study in detail the geological-hydrogeological structure the area of interest in order to suggest the best location for the construction of hydrowells with the most promising results. The 2D images of the geological structure down to the depth of at least 200 meters allowed the better understanding of the behaviour of layered geological formations, since in several cases resistivity values have been calibrated with data from pre-existing boreholes.

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Characterization and Delineation of Gypsum Karst Geohazards Using 2D Electrical Resistivity Tomography in Culberson County, Texas, USA

Journal of Environmental and Engineering Geophysics ◽

10.2113/jeeg22.4.411 ◽

2017 ◽

Vol 22 (4) ◽

pp. 411-420

Author(s):

Adam F. Majzoub ◽

Kevin W. Stafford ◽

Wesley A. Brown ◽

Jon T. Ehrhart

Keyword(s):

Electrical Resistivity ◽

Electrical Resistivity Tomography ◽

Chihuahuan Desert ◽

Two Dimensional ◽

Resistivity Tomography ◽

Delaware Basin ◽

Earth Resistivity ◽

Array Configuration ◽

Resistivity Data ◽

Karst Landforms

The Delaware Basin of W Texas and SE New Mexico is the western subdivision of the Permian Basin and a northern extension of the Chihuahuan Desert. The major evaporite unit within the Delaware Basin is the Castile Formation, which consists of gypsum/anhydrite and is highly susceptible to dissolution and karstification. Manifestations of karst within the Castile outcrop are abundant and include sinkholes, subsidence features and caves, both epigene and hypogene in origin. Land reconnaissance surveys conducted during 2015 and 2016 documented abundant karst landforms near major thoroughfares in Culberson County, Texas. Two dimensional (2D) electrical resistivity surveys were conducted at four sites to characterize and delineate karst related hazards, both laterally and vertically, associated with the road. The electrical resistivity data were collected with a multi-electrode earth resistivity meter using a dipole-dipole array configuration. The resistivity data were then processed using EarthImager2D to produce inverted profile sections of each site. Two-dimensional electrical resistivity tomography was shown to be an effective non-invasive method in detecting solution conduits, soil filled voids, and fractured bedrock in the shallow subsurface in addition to those directly observed on the surface.

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