GEOTECHNICAL INSTRUMENT INSTALLATION

Numac Drilling Services Australia has over 20 years experience installing a wide array of geotechnical monitoring equipment. A focus on sample integrity and strictly controlled installation procedures ensures a high confidence in the integrity of the data. Our geotechnical crews in Melbourne, Brisbane, Sydney and Perth all work to the same high standards and procedures.

 
 
Vibrating wire piezometers come in a varity of designs to suit varied applicaitons and ground conditions.

Vibrating wire piezometers come in a varity of designs to suit varied applicaitons and ground conditions.

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, this 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 both activate the vibrating wire as well as to read the frequency. 

Advantages of Vibrating Wire Piezometers

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. More information about the direct grout-in method can be found in the VW piezometer manual and in a technical note.

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.

 
An inclinometer system has two components: (1) inclinometer casing and (2) an inclinometer measurement system.

An inclinometer system has two components: (1) inclinometer casing and (2) an inclinometer measurement system.

INCLINOMETERS

Inclinometers are used to monitor subsurface movements and deformations. Typical applications 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).

 

 

K Type-Thermocouple Numac.jpg

Thermocouples

A thermocouple is an electrical device consisting of two dissimilar conductors forming electrical junctions at differing temperatures. A thermocouple produces a temperature-dependent voltage as a result of the thermoelectric effect, and this voltage can be interpreted to measure temperature. Thermocouples are a widely used type of temperature sensor. 

Commonly thermocouples are installed inside sonic drill casing to measure landfill and stockpile temperatures.