Collier’s experience in support of tunneling projects includes surface and subsurface geologic and geophysical investigations, as well as full-circumference tunnel mapping. Collier is experienced in geologic characterization for Geotechnical Data Report (GDR) preparation, integrating results from outcrop mapping, surface geophysical investigations, borehole geophysical logging, and cross-hole seismic surveys. 

Collier Experience

• Geologic descriptions of core from land and marine drilling operations
• Full-circumference mapping of shafts, tunnels, and pup-chambers
• Surface monitoring of tunnel boring machine (TMB) vibrations
• Monitoring of vibrations and air-pressures induced by blasting of shafts and tunnels
• Cross-hole seismic tomography along tunnel alignment 
• Borehole geophysical logging with full waveform sonic for rock moduli
• In-situ stress testing of rock

 

Collier’s thorough documentation of its tunnel investigations helps to mitigate environmental and legal concerns, as well as contributes to efficient tunnel design and operations. 

Our sector leader, Mario Carnevale, P.G. and Doug Laymon, P.G. are geophysicists with extensive experience in tunneling investigations. We understand what data you need and can help you plan a survey that will significantly increase your understanding of your site and produce a better result for your client.