scholarly journals Contribution of geophysical methods to the detection of underground cavities in salt series. Development in different projects in Morocco (roads, rail, etc…)

2018 ◽  
Vol 149 ◽  
pp. 02083
Author(s):  
M.K. Tlemçani ◽  
L. Ait Brahim ◽  
A. El Mahsani ◽  
A. Labrihmi
Keyword(s):  
Geophysical Methods ◽  
Geophysical Survey ◽  
Salt Mine ◽  
Electrical Tomography ◽  
Geophysical Investigation ◽  
The Road ◽  
Road Project ◽  
Series Development ◽  
The Stability ◽  
Geotechnical Studies

As part of the geotechnical studies of a road project, a geophysical investigation by electrical tomography, microgravimetry, and boreholes, was carried out in order to locate if the areas can present or not a risks of ground instability along the road alignment. The road is located near a rock salt mine. This geophysical survey had demonstrated that the area may present major risks for the stability of the road platform. This risk is related to the existence of large expanses of saliferous rocks.The dissolution and exploitation of salt provoked underground voids under the future road. The results of this geophysical survey have allowed the designer office to propose more suitable solutions to solve this problem or even the possibility of shifting another site.

scholarly journals Estimation of geotechnical parameters on the basis of geophysical methods and geostatistics

2017 ◽  
Vol 6 (2) ◽  
pp. 70-79 ◽  
Author(s):  
Aleksander Brom ◽  
Adrianna Natonik
Keyword(s):  
Spatial Correlation ◽  
Correlation Functions ◽  
Cross Validation ◽  
Geophysical Methods ◽  
Geophysical Investigation ◽  
Geotechnical Parameters ◽  
Geostatistical Modelling ◽  
Interpolation Methods ◽  
Ordinary Cokriging ◽  
Geotechnical Studies

AbstractThe paper presents possible implementation of ordinary cokriging and geophysical investigation on humidity data acquired in geotechnical studies. The Author describes concept of geostatistics, terminology of geostatistical modelling, spatial correlation functions, principles of solving cokriging systems, advantages of (co-)kriging in comparison with other interpolation methods, obstacles in this type of attempt. Cross validation and discussion of results was performed with an indication of prospect of applying similar procedures in various researches..

scholarly journals Elecrical Tomography and VLF methods contribution to underground wastewater pipe construction

2007 ◽  
Vol 40 (4) ◽  
pp. 1749
Author(s):  
G. Vargemezis ◽  
E. Gerolymatos ◽  
A. Aggelopoulos
Keyword(s):  
Cross Section ◽  
Low Cost ◽  
Fault Zones ◽  
Geophysical Survey ◽  
Treated Wastewater ◽  
Electrical Tomography ◽  
Geophysical Investigation ◽  
Geological Cross Section ◽  
Fault Structures ◽  
Geological Formations

In the area of municipality ofKropia (Attica, Athens) the construction of a tunnel for the transportation of treated wastewater has been decided. The length of the tunnel is approximately 1400 m and it is designed to cross an area at a depth of maximum 100 meters. Geological and tectonic mapping showed the existence of limestone and fault systems zones that are crossing the geological formations. Thus, geophysical survey has been designed in order to provide information about the geological and tectonic status at the proposed area. The application of electrical tomography has been designed in addition with VLF electromagnetic method. The first one was expected to show the geological cross section at the axis designed while the VLF method could provide more detailed information about the fault structures zones at the area. Results of the geophysical survey showed lateral changes of the mechanical behavior of the limestone. In parallel, fault zones that are crossing the axis have been mapped. Considering that engineers need to know the nature of probable problems that they have to deal with, geophysical investigation can provide useful information in a low cost and quick application and contribute to the best decision as concern the final positioning of the tunnel and the penetrating method.

scholarly journals Preliminary geophysical investigation for road construction using integrated methods

2018 ◽  
Vol 65 (4) ◽  
pp. 199-206
Author(s):  
Joel Olayide Amosun ◽  
Gbenga Moses Olayanju ◽  
Oluseun Adetola Sanuade ◽  
Tokunbo Fagbemigun
Keyword(s):  
Geophysical Methods ◽  
Low Frequency ◽  
Road Construction ◽  
Electrode Spacing ◽  
Geophysical Investigation ◽  
Near Surface ◽  
The Road ◽  
Geophysical Surveys ◽  
Integrated Methods ◽  
Resistivity Meter

AbstractIntegrated geophysical methods have been used to investigate the competency of the subsoil. The geophysical surveys conducted involve very low-frequency electromagnetic (VLF-EM) and electrical resistivity (ER) methods (dipole-dipole). ABEM Wadi and Ohmega resistivity meter were used to acquire VLF-EM and ER data, respectively, along two traverses. Station interval of 5 m was used for the VLF-EM survey, while inter-electrode spacing for dipole–dipole was 10 m; the inter-dipole expansion factor (n) ranged from 1 to 5. KHFFILT software was used to generate VLF-EM profiles and pseudosection, while DIPRO software was used for ER. Results from the ER method revealed the pattern of resistivity variations within the study area. The low resistivity values (11–25 Ohm-m) observed at the southern part of the study area could be attributed to changes in clay contents and degree of weathering in the subsurface. The results from the VLF-EM investigation revealed the presence of near-surface linear geologic structures of varying lengths, depths and attitudes, which suggest probable conductive zones that are inimical to the foundation of the road subgrade.

scholarly journals GEOPHYSICAL SURVEY AT THE OMALOS PLATEAU, CHANIA, CRETE

2004 ◽  
Vol 36 (3) ◽  
pp. 1204
Author(s):  
Α. Βαφείδης ◽  
Μ. Μανούτσογλου ◽  
H. Hamdan ◽  
Ν. Ανδρονικίδης ◽  
Μ. Κουκαδάκη ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Seismic Refraction ◽  
Geophysical Methods ◽  
Geophysical Survey ◽  
Electrical Tomography ◽  
Preliminary Results ◽  
The Third ◽  
High Electrical Resistivity ◽  
Electrical Mapping ◽  
Karstic Features

This paper discusses the preliminary results of a geophysical survey that was carried out at the Omalos plateau in Chania, Crete. The geophysical survey included measurements of electrical tomography, electrical mapping, seismic refraction, georadar, VLF and gravity. The aim of this survey is to compare the results from different geophysical methods used in imaging dolines and karstic features. The processing of the measurements indicates three geoelectrical layers. The first layer of extremely high electrical resistivity is attributed to alluvial - dilluvial deposits. The second layer of very low electrical resistivity reflects mainly the presence of marls. Finally, the third geoelectrical layer outlines the carbonate bedrock, whose relief appears highly irregular. The comparison of all geophysical methods leads to the same results, concerning the detection of dolines and karstic anomalies at the Omalos plateau.

scholarly journals Geophysical survey to the Petrified Forest of Sigri in Lesvos Island (North Aegean)

2001 ◽  
Vol 34 (4) ◽  
pp. 1285
Author(s):  
Γ. ΒΑΡΓΕΜΕΖΗΣ ◽  
Η. ΦΙΚΟΣ ◽  
Ι. ΜΕΡΤΖΑΝΙΔΗΣ ◽  
Ε. ΖΑΝΑΝΙΡΙ ◽  
Ζ. ΡΟΥΜΕΛΙΩΤΗ ◽  
...  
Keyword(s):  
Volcanic Activity ◽  
Ground Penetrating Radar ◽  
Volcanic Ash ◽  
Volcanic Rocks ◽  
Geophysical Methods ◽  
Geophysical Survey ◽  
Fossil Plants ◽  
Electrical Tomography ◽  
Ground Penetrating ◽  
Petrified Forest

Remains of fossil plants, which form the famous «Petrified forest of Lesvos», have been found in many localities on the western part of Lesvos Island. The fossilized forest of Lesvos was developed during Late Oligocene to Lower - Middle Miocene, due to the intense volcanic activity in the area (Velitzelos and Zouros, 1997). The products of the volcanic activity had covered the vegetation of the area and the fossilization process took place due to favorable conditions. The fossilized plants in Lesvos are silicified remnants of a sub-tropical forest that existed on the northwest part of the island 20-15 million years ago. In the present study the results of the geophysical survey that has been applied to several locations of the petrified forest are presented. Electrical tomography, magnetic mapping and Ground Penetrating Radar methods of geophysical prospecting have been applied. The surrounding material, which is formed mainly by volcanic ash, contains also volcanic rocks in that size that it could be detected as petrified trunk. So, the effectiveness of the geophysical methods in such an environment has been tested in selected areas where petrified trunks were semi-uncovered. Lied trunks have been successfully detected by the electric tomography in several cases, since the resistivity of the fossilized material is much higher that the resistivity of the volcanic ash. The horizontal mapping of the total magnetic field in the same cases of lied trunks has been also successful since it was combined with the electric tomography and the anomaly were located in the same place and shape. Detection of petrified trunks looks to be uncertain in cases of standing trunks. That, because anomaly of the same pattern could be produced by an intrusion of a rock which the magnetic susceptibility is lower than this of the fossilized material. The same problem has been noticed also to the GPR (Ground Penetrating Radar) data. Several positions to be excavated have been proposed.

scholarly journals APPLICATION OF GEOPHYSICAL METHODS TO THE STUDY OF THE MECHANISM OF SPRINGS

2007 ◽  
Vol 40 (2) ◽  
pp. 605
Author(s):  
G. Vargemezis ◽  
P. Tsourlos ◽  
K. Stamoulis
Keyword(s):  
Water Supply ◽  
Geophysical Methods ◽  
Underground Water ◽  
Geophysical Investigation ◽  
Valley Fill ◽  
Water Flows ◽  
Public Corporation ◽  
Spring System ◽  
The Stability ◽  
Small Valley

The application of geophysical investigation to the study of the mechanism of a spring system is discussed. The springs are located within the Southern minefield of the Power Public Corporation in Ptolemais (Greece) in a small valley which is supposed to be filled with the excavation products of the mine. Thus, the aim is to protect the stability of the future valley fill from the water circulation at its floor. The scope of the survey is to study the mechanism of the spring in order to pump the underground water and minimize the water supply of the main source. A number of wells have been constructed along a line that was considered to cross the path of the underground water in order to pump the water but they failed. Geophysical investigation has been decided in order to contribute to the solution of the problem. Electrical tomographies have been conducted in an effort to detect the underground path where the underground water flows towards the springs. The results of the application of geoelectrical tomography and VLF methods showed a faulting system where the underground water is flowing and finally forms the springs.

Lessons from the ROAD Project for Future Deployment of CCS

2019 ◽  
Author(s):  
Andy Read ◽  
Chris Gittins ◽  
Jan Uilenreef ◽  
Tom Jonker ◽  
Filip Neele ◽  
...  
Keyword(s):  
The Road ◽  
Road Project

Application of geophysical methods for the investigation of the large gravitational mass movement of Séchilienne, France

2005 ◽  
Vol 42 (4) ◽  
pp. 1105-1115 ◽  
Author(s):  
O Meric ◽  
S Garambois ◽  
D Jongmans ◽  
M Wathelet ◽  
J L Chatelain ◽  
...  
Keyword(s):  
Rock Mass ◽  
Mass Movement ◽  
Seismic Refraction ◽  
Geophysical Methods ◽  
Time Lapse ◽  
Gravitational Mass ◽  
Electrical Tomography ◽  
Refraction Tomography ◽  
Geophysical Surveys ◽  
Geophysical Techniques

Several geophysical techniques (electromagnetic profiling, electrical tomography, seismic refraction tomography, and spontaneous potential and seismic noise measurement) were applied in the investigation of the large gravitational mass movement of Séchilienne. France. The aim of this study was to test the ability of these methods to characterize and delineate the rock mass affected by this complex movement in mica schists, whose lateral and vertical limits are still uncertain. A major observation of this study is that all the zones strongly deformed (previously and at present) by the movement are characterized by high electrical resistivity values (>3 kΩ·m), in contrast to the undisturbed mass, which exhibits resistivity values between a few hundred and 1 kΩ·m. As shown by the surface observations and the seismic results, this resistivity increase is due to a high degree of fracturing associated with the creation of air-filled voids inside the mass. Other geophysical techniques were tested along a horizontal transect through the movement, and an outstanding coherency appeared between the geophysical anomalies and the displacement rate curve. These preliminary results illustrate the benefits of combined geophysical techniques for characterizing the rock mass involved in the movement. Results also suggest that monitoring the evolution of the rock mass movement with time-lapse geophysical surveys could be beneficial.Key words: gravitational movement, geophysical methods, Séchilienne.

The use of geophysical prospecting for imaging active faults in the Roer Graben, Belgium

Geophysics ◽  
2001 ◽  
Vol 66 (1) ◽  
pp. 78-89 ◽  
Author(s):  
Donat Demanet ◽  
François Renardy ◽  
Kris Vanneste ◽  
Denis Jongmans ◽  
Thierry Camelbeeck ◽  
...  
Keyword(s):  
High Resolution ◽  
Physical Properties ◽  
Fault Zone ◽  
Geophysical Methods ◽  
Depth Range ◽  
Electrical Tomography ◽  
Reflection Seismic ◽  
Refraction Seismic ◽  
Geophysical Surveys ◽  
Geophysical Techniques

As part of a paleoseismological investigation along the Bree fault scarp (western border of the Roer Graben), various geophysical methods [electrical profiling, electromagnetic (EM) profiling, refraction seismic tests, electrical tomography, ground‐penetrating radar (GPR), and high‐resolution reflection seismic profiles] were used to locate and image an active fault zone in a depth range between a few decimeters to a few tens of meters. These geophysical investigations, in parallel with geomorphological and geological analyses, helped in the decision to locate trench excavations exposing the fault surfaces. The results could then be checked with the observations in four trenches excavated across the scarp. Geophysical methods pointed out anomalies at all sites of the fault position. The contrast of physical properties (electrical resistivity and permittivity, seismic velocity) observed between the two fault blocks is a result of a differences in the lithology of the juxtaposed soil layers and of a change in the water table depth across the fault. Extremely fast techniques like electrical and EM profiling or seismic refraction profiles localized the fault position within an accuracy of a few meters. In a second step, more detailed methods (electrical tomography and GPR) more precisely imaged the fault zone and revealed some structures that were observed in the trenches. Finally, one high‐resolution reflection seismic profile imaged the displacement of the fault at depths as large as 120 m and filled the gap between classical seismic reflection profiles and the shallow geophysical techniques. Like all geophysical surveys, the quality of the data is strongly dependent on the geologic environment and on the contrast of the physical properties between the juxtaposed formations. The combined use of various geophysical techniques is thus recommended for fault mapping, particularly for a preliminary investigation when the geological context is poorly defined.

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