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- MASW (2)
- <p>Karst -- Missouri -- Case studies<br />Acoustic surface waves<br />Electrical impedance tomography</p> (1)
- <p>Pavements -- Testing<br />Geophysical surveys -- Missouri<br />Ground penetrating radar<br />Nondestructive testing<br />Ultrasonic waves</p> (1)
- Center for Data Sciences (1)
- Degradation susceptibility (1)
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- Department of Geological and Mining Engineering and Sciences (1)
- ERT data acquistion (1)
- ERT data interpretation (1)
- ERT data processing (1)
- Electrical resistivity (1)
- Electrical resistivity tomography (1)
- GPR (1)
- Ground Penetrating Radar (GPR) (1)
- Ground Penetration Radar (1)
- Mapping (1)
- Missouri Department of Transportation (MoDOT) (1)
- Multichannel analysis of surface wave (1)
- NDVI (1)
- Non-destructive geophysical tool (NDT) (1)
- Pavement (1)
- Permafrost (1)
- Permittivity (1)
- Phase shift (1)
- Portable seismic property analyzer (PSPA) (1)
- Rebarscope (1)
- Reinforced concrete -- Imaging -- Research<br />Ground penetrating radar<br />Geophysical instruments (1)
- Remote sensing (1)
- Shallow subsurface Geophysics (1)
- Site characterization (1)
- Steel Rebars (1)
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Articles 1 - 6 of 6
Full-Text Articles in Geological Engineering
Utilizing Vegetation Indices As A Proxy To Characterize The Stability Of A Railway Embankment In A Permafrost Region, Priscilla Addison, Pasi T. Lautala, Thomas Oommen
Utilizing Vegetation Indices As A Proxy To Characterize The Stability Of A Railway Embankment In A Permafrost Region, Priscilla Addison, Pasi T. Lautala, Thomas Oommen
Michigan Tech Publications
Degrading permafrost conditions around the world are posing stability issues for infrastructure constructed on them. Railway lines have exceptionally low tolerances for differential settlements associated with permafrost degradation due to the potential for train derailments. Railway owners with tracks in permafrost regions therefore make it a priority to identify potential settlement locations so that proper maintenance or embankment stabilization measures can be applied to ensure smooth and safe operations. The extensive discontinuous permafrost zone along the Hudson Bay Railway (HBR) in Northern Manitoba, Canada, has been experiencing accelerated deterioration, resulting in differential settlements that necessitate continuous annual maintenance to avoid …
Assessment Of Highway Condition Using Combined Geophysical Surveys, Abdallah Alhadi Dera
Assessment Of Highway Condition Using Combined Geophysical Surveys, Abdallah Alhadi Dera
Doctoral Dissertations
"Four pavement sections were investigated using ground penetrating radar (GPR) and Ultrasonic Surface Wave (USW). The objective of this research was to compare the effectiveness of two non-destructive geophysical tools, GPR and the PSPA, in assessing the condition of the pavements, composed of different construction materials. The GPR data were acquired using a 1.5 GHz antenna along five traverses spaced at two ft. intervals approximately 1000 ft. long. On the other hand, the PSPA data were acquired at the stations spaced at 1000 ft. along the five GPR traverses. Core samples were collected at each site to constrain the interpretation …
Integrated Geophysical Approach Using Electrical Resistivity Tomography And Multichannel Analysis Of Surface Wave In Assessing Wilson Spring Development, Ibrahim E. Ahmed
Integrated Geophysical Approach Using Electrical Resistivity Tomography And Multichannel Analysis Of Surface Wave In Assessing Wilson Spring Development, Ibrahim E. Ahmed
Doctoral Dissertations
"This research investigated fractured zones leading to preferential flow paths of Wilson Spring. In this context, electrical resistivity tomography (ERT) data and multi-channel analyses of surface waves (MASW) data were acquired at studied site with the purpose of mapping a variable depth to top of bedrock and geological structures.
Interpretation of the boreholes, MASW, and ERT data indicated that a depth to top of rock does vary significantly at the studied site due to many solution-widened fractures. Multiple near-vertical solution-widened fractures were mapped in the studied site based on the interpretation of the ERT data. The mapped solution-widened fractures appear …
Geophysical Imaging Of Karst Features In Missouri, Jeremiah Chukwunonso Obi
Geophysical Imaging Of Karst Features In Missouri, Jeremiah Chukwunonso Obi
Doctoral Dissertations
"Automated electrical resistivity tomography (ERT) supported with multichannel analysis of surface waves (MASW) and boring data were used to map karst related features in Missouri in order to understand karst processes better in Missouri. Previous works on karst in Missouri were mostly surficial mapping of bedrock outcrops and joints, which are not enough to define the internal structure of karst system, since most critical processes in karst occur underground. To understand these processes better, the density, placement and pattern of karst related features like solution-widened joints and voids, as well as top of bedrock were mapped. In the course of …
Identifying Shallow Subsurface Stratigraphy And Voids Using Dispersive Characteristics Of Electromagnetic And Surface Waves, Payman Hajiani
Identifying Shallow Subsurface Stratigraphy And Voids Using Dispersive Characteristics Of Electromagnetic And Surface Waves, Payman Hajiani
Doctoral Dissertations
"This dissertation presents the results of three manuscripts on spectral analysis of electromagnetic and seismic surface waves to detect subsurface stratigraphy and voids. In the first manuscript, a new technique was developed by utilizing spectral analysis of surface waves to detect subsurface openings. This technique applied the concept of group delay to evaluate the effects of subsurface voids on the phase shift domain. Seismic data sets were acquired at different sites where the shape, size, and depth of the void varied. In all surveys, the time delay technique precisely identified the locations of the subsurface openings. The second manuscript presents …
Imaging Reinforced Concrete: A Comparative Study Of Ground Penetration Radar And Rebarscope, Abhishek Kodi
Imaging Reinforced Concrete: A Comparative Study Of Ground Penetration Radar And Rebarscope, Abhishek Kodi
Masters Theses
"Geophysical techniques have been playing a very vital role in subsurface imaging in the recent past. Technology has been making it both reliable and convenient to utilize non-destructive geophysics techniques like Ground Penetration Radar, Induction current based Rebarscope, Seismic methods, ERT, etc. The applications range from shallow subsurface investigation of Bridge decks to old tunnels, mapping of rabars in a pre-existing construction and analyzing the concrete strength.
The thesis constitutes of a comparative study and analysis of a Ground Penetration Radar system and a Rebarscope. Individual parameters obtained directly from the study and obtained indirectly from the study shall be …