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August 21, 2014

NDE Users Seminar
September 30-
October 2, 2014
Register Now!

NDT System Add-On — Crosshole / Downhole Seismic

USA Sales: 571.379.5334          International Sales: Click here for Map

Crosshole/Downhole Seismic

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Base Model:
CS/DS-1 Model

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Scroll down to see a list of Available Models and Key Features for the Crosshole Seismic / Downhole Seismic test method.

Save money! Contact Olson Instruments when adding on to an existing system, or purchasing multiple systems as some of the components are common to other test methods.

 

Crosshole/Downhole Seismic (CS/DS) investigations provide information on dynamic soil and rock properties.


The Crosshole Seismic (CS) system and method determine shear and compressional wave velocity versus depth profiles. From these measurements, parameters, such as Poisson’s ratios and moduli, can be easily determined. In addition, the material damping can be determined from CS tests. These dynamic soil and rock properties are often utilized for earthquake design analyses necessary for certain structures, liquefaction potential studies, site development, and dynamic machine foundation design. The most complete version of this downhole system, as manufactured by Olson Instruments, is comprised of a borehole source capable of generating shear and compressional waves and a pair of matching three component triaxial geophone receivers. These instruments are lowered to the same depth in boreholes set at ~ 10 ft (3 m) apart in a line. The instruments are coupled to the side of the grouted borehole inclinometer casing, allowing for the detection of shear and compressional waves as they pass between the receivers.

The Downhold Seismic (DS) investigations are similar to CS investigations, but require only one borehole to provide shear and compressional velocity wave profiles. The DS method uses a hammer source at the surface to impact a wood plank and generate shear and compressional waves. This is typically accomplished by coupling a plank to the ground near the borehole and then impacting the plank in the vertical and horizontal directions. The energy from these impacts is then received by a pair of matching three component geophone receivers, which have been lowered downhole and are spaced 5 to 10 ft (1.5 to 3 m) apart.

Freedom Data PC Platform Required, Sold Separately
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Training


Hands-on training is available for all of our Nondestructive Testing Methods at our Wheat Ridge, Colorado (USA) location, which is a suburb located appromately 15 minutes northwest of downtown Denver. Training may be available at your location by one of our agents upon special arrangement.

For complete details about the Crosshole Seismic / Downhole Seismic system available as an add-on test for the Freedom Data PC platform, call toll free 1-888-423-1214 or email:

details@olsoninstruments.com

 
 

Applicable On:

  • Soil & Rock for Seismic and Vibrating Machine Foundation Design
 
 

Test For:

  • Image Voids, Solution Caverns, Washouts with Tomography
  • Locate Faults, Fractures
  • Seimic Shear & Compressional Wave Velocities
 

Meets ASTM:

  • D4428
  • D4428M-07
  • D7400 (DS)

Meets ACI:

  • N/A





 


 
All of Olson Instruments have been researched, tested, and used on-site daily by our sister company, Olson Engineering, world reknowned for NDT consulting. The OE Website is loaded with Tech Brief and project photos using the equipment shown on this website. Purchase our products to “do-it-yourself”, or hire an Olson Engineering Nondestructive Testing professional for your next project