SERVICES

Caisson Video Inspection

Subsurface Geotech's custom built cameras are unique in the industry. Our video inspections can be performed under water or in the dry. We will verify the quality of the rock socket and confirm the caisson is free of debris.


Ground, Structure, and Tunnel Monitoring Instrumentation

Subsurface Geotech offers a full range of geotechnical instrumentation, including both installation and remote monitoring capabilities. These instruments provide vital real time information on soil/ structural movement, groundwater pressures, vibration, stress/strain, and more.

  • Inclinometers
  • Shape Accelerometers
  • Extensometers
  • Piezometers
  • Settlement Points
  • Vibration Monitoring
  • Strain Gauges
  • Tilt Monitors
  • Joint/Crack Meters
  • Deflection/Movement
  • Temperature Sensors

Settlement Cells


SQUID quantitatively measures the soft material or sediment that may be covering the bearing strata, at the bottom surface of the caisson. The SQUID test consists of mounting the device on a Kelly Bar, and lowering it to the bottom of the bearing strata to measure force and displacement at the bottom of the caisson, quantitatively assessing the sediment thickness of the excavation bottom.

SQUID Inspection


PDA Testing

The Pile Driving Analyzer (PDA) system is the most widely employed system for dynamic load testing and pile driving monitoring in the world. High Strain Dynamic Load Tests, also called PDA tests, assess the capacity of several piles in a single day through a nondestructive technique. Pile Driving Analyzer systems also evaluate shaft integrity, driving stresses and hammer energy when monitoring pile installation.


The Crosshole Sonic Logging (CSL) method is used to evaluate the quality of the concrete of deep foundations. Testing is performed with a Cross-Hole Analyzer (CHA) manufactured by Pile Dynamics Inc. During the test a transmitter is lowered down one of the tubes and sends a high frequency signal to a receiver inserted in another tube. The transmitter and receiver move down each pair of tubes, scanning the entire length of the shaft for imperfections and voids in the concrete.

CSL Testing


QVE & Inspection

On-site technical representation during foundation and embankment construction to confirm that all components of work are carried out in general conformance with the requirements of the contract documents and drawings.

PIT Testing

The Pile Integrity Tester (PIT) is used to determine that a pile or shaft is free of major cracks and voids, prior to construction of the superstructure. It may be used on most concrete or wood foundations. The PIT may also be used to test piles integral in the structure, such as those supporting existing bridges or towers, and may assess their length.

Crane Pad Design

Proper ground conditions are essential to assist with safe set up and operation of cranes. Subsurface Geotech will design a crane pad for any site conditions to withstand the loads and pressures imposed by the lifting equipment

Plate Load Test

A plate load test is performed in the field to determine the ultimate bearing capacity of soil and the expected settlement under said loading conditions.

Thermo Integrity Profiling

Evaluation of the entire cross-section and the entire length of the deep foundation element measuring heat generated by curing cement to assess the quality of drilled shafts/bored piles, augered cast in place (ACIP)/continuous flight auger (CFA) or drilled displacement piles, slurry walls, barrettes, soil nails, and jet grouted columns.

Helical Pile Load Testing

Dynamic, non-destructive load testing of helical piles and micro-piles. This provides an alternative to static testing and is designed to activate a large range of test loads.