Chapter
Aug 30, 2024
Geophysics: Non-Invasive Techniques to Characterize Subsurface Geologic Conditions and Potential Hazards along Proposed Pipeline Alignments
Publication: Pipelines 2024
ABSTRACT
Geophysical testing can provide important geotechnical and geologic information along proposed pipeline alignments, trenchless crossings, such as a river or creek, or along any location where more information regarding subsurface conditions is needed. Geophysical testing results in continuous profiles of the subsurface that can “connect the dots” between geotechnical borings in areas where the subsurface geology is highly variable and/or hazards may be present. The most common geophysical methods for such work include seismic testing (refraction and MASW), electrical resistivity tomography (ERT), and ground penetrating radar (GPR). Some specific applications include bedrock mapping, hazard investigations (voids and failing soils), stratigraphic analysis, rock rippability, karst investigations, and hydrogeologic investigations. Pyramid Geophysics has utilized ERT to examine geologic conditions in karst environment to identify voids and solution channels along a proposed horizontal directional drill (HDD) alignment in Nashville, TN. Specifically, the geophysical results were incorporated into a geotechnical model using GIS data to present locations where the proposed HDD may encounter air-filled voids and significant weathering/dissolution within a limestone formation. Pyramid has also used a combination of seismic MASW testing and ERT to examine bedrock depth and integrity (e.g., fractures, weathered zones) along sections of alignment both on land and across rivers in submerged environments in Central North Carolina. Correlations were made between seismic velocity thresholds, electrical resistivity levels, and geotechnical boring refusal depths to provide continuous geologic profiles along an alignment exhibiting significant topographic and geologic variability. This paper will provide background on these various geophysical methods and case studies, showing the benefit of combining geophysical investigations with traditional geotechnical approaches.
Get full access to this chapter
View all available purchase options and get full access to this chapter.
Information & Authors
Information
Published In
History
Published online: Aug 30, 2024
Permissions
Request permissions for this article.
Authors
Affiliations
1Senior Geophysicist, Pyramid Geophysics, Greensboro, NC. Email: [email protected]
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.
View Options
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Get Access
Access content
Please select your options to get access
Log in/Register
Log in via your institution (Shibboleth)
ASCE Members:
Please log in to see member pricing
Purchase
Save for later Item saved, go to cart Information on ASCE Library Cards
ASCE Library Cards let you download journal articles, proceedings papers, and available book chapters across the entire ASCE Library platform. ASCE Library Cards remain active for 24 months or until all downloads are used. Note: This content will be debited as one download at time of checkout.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.
Terms of Use: ASCE Library Cards are for individual, personal use only. Reselling, republishing, or forwarding the materials to libraries or reading rooms is prohibited.