Bund calculator
As bunding is a common control for managing uncontrolled rilling of material at a drawpoint, a bund calculator has been added into the inrush management app. It allows the user to input various measurements for each drawpoint including brow to bullnose distances, brow height, rill angles of the drawpoint material, the amount of overbreak experienced. These then combine with global user defined parameters for bund height, bund rill angle and the amount of space needed for operational reasons to test if the designed bund can fit in the available drawpoint crosscut (in a block caving situation) and determines the location of the bund apex from the brow to manage the volume of material that could rill prior to the brow choking off.
The approach used in the calculator is defined by Resources Safety & Health Queensland, and supported by the NSW Resources Regulator (2017).
Example of bund placement considering drive height, rill angle and overbreak (RSHQ, 2010)1.