Robertson Geo Operational Services successfully completed a geotechnical inspection for Breedon on boreholes utilising a High Resolution Optical Televiewer (Hi-OPTV) and 3-Arm Caliper probes.
Following phase two of the quarry extension, the extraction of 6,375,000 tonnes of limestone and 1,455,000 tonnes of Golden Amber will begin. The duration of this stage is c.15.7 years, which will be determined by the time taken to work out the Golden Amber and thus release future tipping space for further stripping of the extension.
The Hi-OPTV provides a continuous very high resolution-oriented image of the borehole wall using a conventional light source. A unique optical system based on a fisheye lens allows the probe to survey 360 degrees simultaneously.
Fractures faults and voids can be detected using the Hi-OPTV to characterise features intersecting the borehole wall, including bedding, drilling-induced/natural fractures and faults. Integrated orientation measurements allow the inclination and direction of features to be understood relative to the borehole dip direction, or true or magnetic north.
Image: The clarity of the Hi-OPTV was superb making it easy to identify fractures, voids, bedding, and the changing geology at given depths below ground level. All vital information for a client in a geotechnical investigation such as this.
