Thank you BBUGS and BOHOGS for the opportunity to present today

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Presentation transcript:

Thank you BBUGS and BOHOGS for the opportunity to present today

Vibrating Wire Technology What is it?

How does it work? The resonant frequency of vibration of a tensioned wire is proportional to the strain or tension in the wire. This fundamental relationship is utilized in a variety of configurations for the measurement of strain, load, force, pressure, temperature and tilt.

History of the technology Vibrating wire technology has been around since early 1928 in France and Germany The technology really advanced in 1954 when Telemac of France developed the twin coil sensor Further refinement was developed by Irad then Geokon for the USA in the late 1900’s Today the technology is well accepted throughout the world

Applications in UG Coal Mining Roof & rib monitoring Pore water monitoring Pore gas monitoring Convergence, both vertical and horizontal Strain Load Temperature Tilt Displacement Stress

Advantages Vibrating wire sensors are well known for Long term stability Excellent resolution Exceptional sensitivity

Application in open cut mining High wall monitoring Displacement Tilt Strain Load Water studies

Approvals GEL Instrumentation has approval for use in underground coal mines in Australia Approval no: IECEx.SIM 13.0014X All approved vibrating wire sensors to be used in conjunction with the Model 404 digital readout unit only Up to 1000 metres of signal cable

Pressure transducers Water Gas Other liquids Resolution 0.025% FS Accuracy 0.1% FS Pressure ranges from 0.35 to 70 Mpa

Strain Gauges Can be used to measure loads in: Rock bolts Steel tendons Struts Chains Goaf seals

Load Cells Can be used to monitor loads on: Conveyor supports Rock bolts Cable tendons Megabolts Cable bolts etc.

Tilt Meters Can be used to monitor deflection in: Struts Supports Goaf seals Rib dilution Roof dilution

Temperature Each of the vibrating wire sensor has a inbuilt thermistor to measure temperature at its installed location

Stress Meters Uniaxial type Range in tension 3 MPa Range in compression 70 MPa

The Model 404 Readout

Field Data Plots Borehole Monitoring

Field Data Plots Stress Change in Roof Rock Tunnel

Thank you!