Borehole Deformation System BDS-01

Borehole deformation System BDS-01

 

The borehole deformation system is based on the fiber optic sensing technology and is designed to monitor the deformation in the longitudinal direction of a borehole.Within the borehole, different fixation points can be realized at well defined positions by using special borehole anchors. Furthermore, a strain cable SC-01 is connected between each anchoring point and a metal head plate fixed at the entrance of the borehole. In this way, the displacement of each anchoring point relative to the entrance point of the borehole can be measured. Furthermore, a temperature cable can be inserted to measure the temperature distribution inside the borehole.

Features

  • Measurement of axial displacements in boreholes for up to 6 different anchoring points

  • Temperature cross-sensitive: when large temperature variations are expected, a temperature chain can be inserted for compensation purposes

Technical parameters

Parameter

Value

Number of extensometers

≤ 5

Displacement resolution

0.85 µε

Displacement precision

1.7 µε

Displacement range

1 % FD

Operating temperature range

-20 °C to +60 °C

Number of temperature sensors

On request

Depth of the borehole

≤ 20 m

Diameter of the borehole

86 mm

Connector type

FC/APC

Applications

  • borehole deformation movements and thermo-mechanical characterization of clay, rock, granite and salt cavities or tunnels

  • measure and monitor settlement in a foundation due to construction of a heavy structure over the foundation

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