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BOREHOLE EXTENSOMETERS

CATEGORY > Extensometers + Compressometers

BOREHOLE EXTENSOMETERS

DESCRIPTION

Stability and movement behavior of soil and rock masses can be determined by the use of borehole extensometers. A typical rod extensometer consists of a reference head, usually installed at the collar of a drill hole, and one or more in-hole anchors, each of which is fixed in place at a known depth in the borehole. As the soil or rock deforms, the distances between adjacent in-hole anchors change, as do the distances between the individual in-hole anchors and the reference head. This allows an accurate determination of distribution, magnitude, rate and acceleration of deformation in the rock or soil mass intersected by the drill hole.

The number of anchors and anchor depths should be selected based on site geology, geometry of structures in the area, and other site-specific details. The use of two, or more, anchors at various depths allows the engineer to distinguish between potentially dangerous deep seated movements and more trivial surface spalling.

APPLICATIONS

Monitoring deformation around underground excavations.


Movement behind the face of excavated slopes.


Consolidation settlement in soils.


Bottom heave in open cut excavations.


Strain in concrete structures.


Subsidence over mines, tunnels, etc.


Pile load tests.


Monitoring of mine pillar deformation.


Deformation of foundations in and under buildings.


Roof and wall stability in mines and underground workings.

QUICK SPECS

Accurate and reliable.


Easily adapted to remote readout.


Anchor lengths can be varied in the field.
* for Rigid Rod Extensometers only.


Rugged, easy to install, and simple to operate.

BENEFITS

Increase Safety


Increase Productivity


High Accuracy


High Reliability

DESCRIPTION

Stability and movement behavior of soil and rock masses can be determined by the use of borehole extensometers. A typical rod extensometer consists of a reference head, usually installed at the collar of a drill hole, and one or more in-hole anchors, each of which is fixed in place at a known depth in the borehole. As the soil or rock deforms, the distances between adjacent in-hole anchors change, as do the distances between the individual in-hole anchors and the reference head. This allows an accurate determination of distribution, magnitude, rate and acceleration of deformation in the rock or soil mass intersected by the drill hole.

The number of anchors and anchor depths should be selected based on site geology, geometry of structures in the area, and other site-specific details. The use of two, or more, anchors at various depths allows the engineer to distinguish between potentially dangerous deep seated movements and more trivial surface spalling.

QUICK SPECS

Accurate and reliable.


Easily adapted to remote readout.


Anchor lengths can be varied in the field.
* for Rigid Rod Extensometers only.


Rugged, easy to install, and simple to operate.

APPLICATIONS

Monitoring deformation around underground excavations.


Movement behind the face of excavated slopes.


Consolidation settlement in soils.


Bottom heave in open cut excavations.


Strain in concrete structures.


Subsidence over mines, tunnels, etc.


Pile load tests.


Monitoring of mine pillar deformation.


Deformation of foundations in and under buildings.


Roof and wall stability in mines and underground workings.

BENEFITS

Increase Safety


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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