Document Type

Conference Paper

Publication Date


Publication Details

Benjamin Blacka, Stuart MacGregor, Adrian Rippon, Michael Melville, Graham Wylie and Anne Wyl, Application of smartshear to define rock mass shear about coal mine roadways, in Naj Aziz and Bob Kininmonth (eds.), Proceedings of the 2019 Coal Operators Conference, Mining Engineering, University of Wollongong, 18-20 February 2019, 180-187.


Shear movement of strata surrounding excavations is a critical factor in overall excavation stability. Understanding the location, timing, magnitude and direction of shear failure surrounding an excavation is useful for assessing primary and secondary roadway support requirements. A new routine shear monitoring instrument known as the SmartShear has been developed to accurately measure shear movement at multiple locations within a borehole. The shear movement is measured on a two dimensional plane at 90 degrees to the installation of the instrument using a series of tiltmeter sensors. Continual change in shear direction and magnitude over time is measured once the shear locations are detected. This paper presents the findings from a field trial at Oaky North Mine, using the SmartShear system, assessing shear movement surrounding coal mine roadways. The timing and magnitude of shear movement along bedding planes and geological contacts has been measured during drivage of roadways. This paper is part of the ACARP project C25060.