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Base Models:
CS-1 (Crosshole Seismic) with P-SV Source
click here for enlarged view [+]
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Scroll down to see a list of Key Features and Models available for the
Crosshole Seismic/Downhole Seismic and P-SV Source Systems.
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.
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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.
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
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Applicable On:
- Soil & Rock for Seismic and Vibrating Machine Foundation Design
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Test For:
- Image Voids, Solution Caverns, Washouts with Tomography
- Locate Faults, Fractures
- Seimic Shear & Compressional Wave Velocities
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Meets ASTM:
- D4428
- D4428M-07
- D7400 (DS)
Meets ACI:
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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
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