Geotechnical Overview
As a critical component of the Design Study Report, a geotechnical overview must be prepared to synthesize existing geological and environmental data. This overview ensures that potential structural risks are identified early in the design phase, providing a foundation for safe and efficient infrastructure development.
Required Data Review
The geotechnical overview must include a comprehensive review of readily available information, including but not limited to the following resources:
- WVDOH Geotechnical Unit: Analysis of any existing boring logs or historical soil data available for the site.
- WVGES Interactive Coal Maps: A review of the WVGES Coal Maps to identify potential conflicts with historical or active mining operations.
- WVDEP TAGIS Applications: Examination of the WVDEP TAGIS system to locate permits for mining, quarrying, oil, and gas operations nearby.
- LiDAR Hillshade Mapping: Utilization of LiDAR data to identify possible scarps or geological anomalies. Access is available via WVDEP GIS Services.
Minimum Reporting Requirements
At a minimum, the overview—typically reported on approximately one page—shall include the following technical details based on a mandatory site visit by a geotechnical engineer:
| Category | Required Technical Detail |
|---|---|
| Geological Context | Geologic age of near-surface bedrock; group or formation names of the strata. |
| Structural Orientation | General strike bearing and dip angle of the rock units. |
| Material Types | Identification of prevalent surface soil and rock types. |
| Slope Design | Recommended rock cut and fill slope ratios for roadway cut slopes and bridge approach fills. |
Geohazard Assessment
The engineer must provide a detailed discussion regarding potential geohazards that could impact the project’s longevity or safety. This includes naming specific rock units, seams, or soil types associated with:
- Mining & Karst: Identification of voids, sinkholes, or subsidence risks.
- Landslides: Analysis of slope stability and historical movement in the area.
- Rockfalls: Evaluation of high-risk rock faces and potential mitigation needs.
Mandatory Action: All geotechnical overviews must be corroborated by an on-site inspection conducted by the geotechnical engineer or an authorized representative.
Contact WVDOT Communications:WVDOTCommunications@wv.gov
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