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Non-encapsulated (left) and Encapsulated (right) Borehole Pressure Cells
Non-encapsulated (left) and Encapsulated (right) Borehole Pressure Cells
Close-up of Non-encapsulated (left) and Encapsulated (right) Borehole Pressure Cells Close-up of Borehole Pressure Cell Gauge Readout

BOREHOLE PRESSURE CELL

CATEGORY > Load + Stress + Pressure Sensors

BOREHOLE PRESSURE CELL

DESCRIPTION

Borehole Pressure Cells have a long term track record of stress monitoring in both elastic and viscoelastic rock. While typically classified as a soft inclusion, the cell may be filled with mercury to gain stiffness for use as a rigid inclusion in low modulus 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.

QUICK SPECS

Low cost.


Stainless or copper construction.


Simplicity of operation.


Remote readout available.


Field rugged and reliable.


Data logger compatible.

APPLICATIONS

Monitor stress in elastic and viscoelastic rock.

BENEFITS

Increase Productivity


High Accuracy


High Reliability

DESCRIPTION

Borehole Pressure Cells have a long term track record of stress monitoring in both elastic and viscoelastic rock. While typically classified as a soft inclusion, the cell may be filled with mercury to gain stiffness for use as a rigid inclusion in low modulus 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.

QUICK SPECS

Low cost.


Stainless or copper construction.


Simplicity of operation.


Remote readout available.


Field rugged and reliable.


Data logger compatible.

APPLICATIONS

Monitor stress in elastic and viscoelastic rock.

BENEFITS

Increase Productivity


High Accuracy


High Reliability

CONTACT US

RST Instruments Ltd.

11545 Kingston Street
Maple Ridge, BC
Canada V2X 0Z5

604-540-1100

1-800-665-5599

Fax: 604-540-1005

info@rstinstruments.com

CONNECT WITH RST

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ASK A QUESTION

CONTACT US

RST Instruments Ltd.

11545 Kingston Street
Maple Ridge, BC
Canada V2X 0Z5

604-540-1100

1-800-665-5599

Fax: 604-540-1005

info@rstinstruments.com



CONNECT WITH RST

Linkedin icon
Youtube icon

ASK A QUESTION

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