Borehole Pressure Cells
Borehole Pressure Cells have a long term track record of stress monitoring in both elastic and viscoelastic rock.
Borehole Pressure Cells have a long term track record of stress monitoring in both elastic and viscoelastic rock. Product development is largely the result of research done by the U.S. Bureau of Mines (Panek & Stock 1964, and Smith 1972).
Cells are available in two basic configurations, a miniature flatjack version (BPC) and a cylindrical pressure cell (CPC). Due to the flat design, the BPC responds primarily to the stress in the plane perpendicular to the cell, and is only slightly affected by stress in the same plane. Two BPC’s mounted at right angles to each other in the same borehole therefore will monitor the principal stresses in the plane perpendicular to the borehole. Biaxial stress measurement will require three BPC’s in the same borehole.
While not appropriate for anisotropic stress conditions, the CPC will measure the average change in the principal stresses in the plane perpendicular to the borehole.
|Range||0 – 10,000 PSI (0 – 70 Mpa)|
|Sensitivity with Gauge Readout||40 PSI (300 kPa)|
|Accuracy with Gauge Readout||1%|
|Dimensions||508 (L) x 50 (W) x 9.53 (D) mm|
Borehole Pressure Cells are commonly used to monitor stress in elastic and viscoelastic rock.
|Borehole Pressure Cell with Vibrating Wire Transducer||BPC001-VW|
|OPTIONAL: Borehole Pressure Cell Encapsulation||BPC001-E|
|1/8” diameter High Pressure SS Tube||BPC001-T|
|NON-ENCAPSULATED||Head Adapter with Orientation Handle||BPC300|
|NON-ENCAPSULATED||1.5 m Rod||BPC310|
|ENCAPSULATED||1.5 m Rod||BPC210|
I’m very happy with the quality of the instrumentation and technical support from RST, as always. They worked with us from the initial stages of the project to ensure that we were fully prepared and equipped to use the RSTAR network for the first time. They delivered everything within the tight project time frame to ensure that there were no delays on site, and the submersible tilt meters looked like new even after over twelve months of being submerged in Thames water!
-Richard Lipscombe, BEng (Hons), Director & Principle Consultant - RL Geotechnical Ltd