DA Smith's tunnel drilling services include coring and rotary drilling at any angle inside tunnels and the installation of geotechnical instrumentation, including extensometers, stress cells, piezometers, and datalogger systems. Coring diameters include B, N, H, P, and 5.6-inch-diameter, including oriented core. DA Smith works with multiple recognized geophysical vendors to provide downhole optical, acoustic, and other geophysical or structural logging services and interpretation.
DA Smith's skid-mounted drills can be transported readily by wheeled equipment or rail in most tunnels, and our track-mounted drills are self-tramming inside larger tunnels. DA Smith's permissible drills are MSHA certified and can operate in gassy environments. Services can be scaled to satisfy a wide range of tunnel projects.
Tunnel drilling services include:
- Core drilling for geotechnical characterization
- Directional wireline coring along tunnel alignments
- Oriented core
- Rotary drilling
- Downhole deviation surveys
- Downhole geophysical and structural logging with subcontracted firms
- Utility and drain holes
- Monitoring wells
- Water hammer drilling for sensitive sites where air hammer drilling is prohibited
- Geotechnical sampling and testing
- Installation of geotechnical instrumentation and data logging systems
- In situ stress measurements in rock and concrete
