With hundreds of geotechnical engineers, soils technicians, and drillers on staff, Tetra Tech is a leader in geotechnical engineering in North America. We use state-of-practice techniques and test procedures to investigate, analyze, and develop geotechnical engineering recommendations and designs for simple and complex groundwater, soil, and rock challenges.

Our services include:

Investigation

• Onshore and offshore site investigations using cone penetration test (CPT), standard penetration test (SPT), large penetration test (LPT), dynamic cone penetration test (DCPT), and rotary sonic
• Hydrogeological investigations and permeability testing
• Geologic hazard identification
• Avalanche and rockfall evaluations
• Granular resource evaluations
• Geotechnical laboratory testing
• Borrow material investigation and evaluations
• Geotechnical instrumentation
• Geomechanical assessment of caprock formation strength (using high-pressure triaxial test)
• Air photo interpretation
• Ground reconnaissance and terrain assessment and surficial geology mapping
• Geophysical investigations (onshore, offshore, and downhole)
• GIS mapping and analysis of LiDAR and satellite imagery
• Rock mass classification and property assessment

Analysis

• Permafrost engineering and geothermal analysis
• Seismic hazard evaluations and earthquake engineering
• Sedimentation control studies
• Engineering risk assessment
• Slope stability analysis
• Dewatering and seepage analysis
• Corridor route evaluations for roads, railways, and pipelines
• Site geotechnical feasibility analysis
• Dam safety geotechnical review
• Acid rock drainage and metal leaching prediction and assessment
• Liquefaction triggering assessment
• Earthquake-induced lateral spreading assessments
• Settlement estimation
• Numerical modelling (FLAC, UDEC, PLAXIS, and GEMCOM)
• Free-field seismic and soil-structure interaction analysis

Design

• Foundation designs (deep, shallow, and dynamic)
• Rock cut and tunnel design
• Assessment and design of earth- and rock-fill dams
• Slope remediation and reclamation design
• Design of road, railway, and airstrip embankments
• Soil-pipe-interaction design guidance for pipelines and hydrocarbon well casings
• Waste facilities design
• Erosion protection for stabilization measures
• Geotechnical design of mechanically stabilized earth (MSE), gravity, and cantilever retaining walls and shoring systems
• Blast design and overbreak and underbreak mapping and evaluation
• Ground improvement design
• Trenchless technology