Gregg Drilling offers a number of specialized tests for geotechnical investigations. All are combined with standard rotary drilling techniques to implement the equipment. These tests include:
- SPT Energy Calibration/Hammer Calibration
- Vane Shear Testing (VST)
- Pressuremeter Testing (PMT)
Gregg also offers Dilatometer testing (DMT) and Seismic DMT which can be advanced with the CPT equipment or direct push methods.
Gregg operates the TEXAM Pressuremeter manufactured by RocTest. The TEXAM PMT is deployed in a pre-drilled borehole. The PMT probe is filled with water in uniform increments and an insitu stress-strain curve is obtained by plotting the injected volume against pressure.
Vane Shear Testing
Gregg operates the Geonor H-10 vane system. The Geonor H-10 uses an up-hole motor to turn the downhole vane for the test. Vane shear testing provides an in-situ measurement of undrained shear strength. The system uses different vane sizes for downhole testing. Vane Selection is based upon the expected strength of the soils being tested.
Dilatometer & Seismic DMT Testing
Gregg deploys a seismic dilatometer (SDMT) made by Studio Marchetti in Italy. The probe is capable of conducting dilatometer and seismic testing down to 50m, or approx. 150ft in depth.
For additional information on the Dilatometer, please see our equipment page.
We’re ready for you
With over 35 years experience drilling in California and surrounding states, Gregg Drilling can handle any size project. We hope to demonstrate our value through quality equipment, knowledgeable and experienced personnel and our exceptional safety standards.