GEOTECHNICAL INSTRUMENT INSTALLATION
Numac Drilling Services Australia has over 20 years’ experience installing geotechnical monitoring equipment, including inclinometers, vibrating wire sensors and thermocouples. With our focus on sample integrity and strictly controlled installation procedures, Australian clients can be completely confident in the integrity of the data delivered. Wherever your project is located, you can rest assured our Melbourne, Brisbane and Sydney geotechnical drilling crews all work to the same industry-leading standards and procedures.
Vibrating Wire Piezometer
A vibrating wire sensor measures a mechanical load using a wire that vibrates at a high frequency. The applied external force changes the tension on the wire which changes the frequency. The frequency is measured and indicates the amount of force on the sensor. The load sensor has an integrated electronic system to activate the vibrating wire and read the frequency emitted. The advantages of employing vibrating wire piezometers include:
High resolution: VW piezometers provide a resolution of 0.025% of full scale
Groutable: The VW piezometer can be directly grouted-in with a bentonite-cement grout
Reliable signal transmission: With properly shielded cable, signals from the VW piezometer can be transmitted long distances
Temperature measurement: All VW piezometers are equipped with a temperature sensor.
Inclinometers are used to monitor subsurface movements and deformations. Numac provides inclinometer installations for a broad range of applications which include:
Detecting zones of movement and establish whether movement is constant, accelerating, or responding to remedial measures.
Verifying stability of dams, dam abutments, and upstream slopes during and after impoundment.
Monitoring settlement profiles of embankments, foundations, and other structures (horizontal inclinometer).
Thermocouples are electrical devices consisting of two dissimilar conductors which form electrical junctions at different temperatures. One of the most widely used temperature sensors, thermocouples produce temperature-dependent voltage as a result of the thermoelectric effect.