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Technique

Geophysical Methods

A vibrator or hammer sends surface waves into the ground. Sensors (geophones) detect how those waves travel. The speed of the waves changes depending on soil stiffness. Faster waves = stiffer ground | Slower waves = softer ground. Software turns the wave data into a velocity profile of the subsurface

  • Soil Nails
  • Self-Drilling Anchors
  • Stressed Anchors
  • Rock Bolts
  • Strand Anchors
  • Auger Drilling
  • Rotary Drilling
  • Percussion Drilling
  • Jet Drilling
  • Diamond Drilling
  • Walkover Survey
  • Test Holes
  • Surveys
  • Soil Material Recovery
  • Logging and Profiling
  • Laboratory Testing
  • In-situ Tests
  • Geophysical Methods
  • Desk Study
  • Contiguous Pile Wall
  • Mixed-in-place Slurry Wall (MIPW)
  • Secant Pile Wall
  • Soldier Pile Wall
  • Sheet Pile Wall
  • Mechanically Stabilize Earth Wall (MSE)
  • Displacement Piling
  • Driven Cast In-Situ Piles (DCIS)
  • Open Hole Auger Piling
  • Cased Auger Piling
  • Limited Access Piling
  • Micro Piling
  • Odex / Symmetrix Piling
  • Oscillator Piling
  • Driven Precast Piling
  • Percussion Piling
  • Underpinning
  • Marine Piling
  • Tubular Piling
  • Sheet Piling
  • Post Ramming
  • Ductile Iron Piles
  • Rota Piles (DTH Air Driven Hammer)
  • Spot Bolting
  • Deep Foundations
  • Lateral Support
  • Geotechnical Investigations
  • Slope Stability
  • Retaining Structures
  • Tunnels
  • Materials
  • Soil Improvement
  • NHBRC Certification – Foundation
  • Site verification and process control
  • Rockfall Mitigation Systems
  • Erosion Protection
  • Gabion Walls
  • Landslide Mitigation Systems
  • Dynamic Compaction
  • Consolidation Grouting
  • Compaction Grouting
  • Jet Grouting
  • Soil Mixing
  • Rigid Inclusions
  • Stone Columns
  • Vibro Compaction
  • Impact Compaction
  • Dry-Mix Applications
  • Wet-Mix Applications
  • Dynamic Load Testing
  • Integrity Testing
  • Pull-out Testing
  • Static Load testing

Geophysical Methods

technique

A vibrator or hammer sends surface waves into the ground. Sensors (geophones) detect how those waves travel. The speed of the waves changes depending on soil stiffness. Faster waves = stiffer ground | Slower waves = softer ground. Software turns the wave data into a velocity profile of the subsurface

Where this technique is applied

  • Shear wave velocity (Vs)
  • Soil Stiffness
  • Layer Thickness
  • Overall Ground Profile
  • Lithology changes (clay vs sand vs rock)
  • Water table depth and groundwater flow
  • Karst, cavities, sinkholes
  • Contamination plumes
  • Weathered vs fresh rock
  • Faults and fractures
  • Depth to bedrock for construction
  • Groundwater and salinity changes
  • Contamination plumes (leachate, hydrocarbons, industrial waste)
  • Buried metals & utilities (pipes, tanks)
  • Karst / void detection in some cases
  • Agricultural soil mapping
  • Salinization in irrigation areas
  • Buried utilities (pipes, cables)
  • Voids, sinkholes, karst
  • Rebar and features inside concrete
  • Foundations, slabs, buried structures
  • Pavement thicknesses
  • Archaeological features (walls, graves, tunnels)
  • Water table in dry ground
  • Soil layering & backfill changes

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