Innovative use of SMART cable bolt data through numerical back analysis for interpretation of post-failure rock mass properties

摘要

A significant component of underground mining costs stems from ground support in the form of rock bolts, mesh and screen, cable bolts, and shotcrete. Should any of this support approach or reach failure (stripped or broken cable bolts, severe bagging of screen, large numbers of broken rock bolts, etc.), the support needs to be rehabilitated. This rehabilitation is often much more expensive than the initial support installation, due not just to the cost of the support, but to loss of access, downtime of that area of the mine, potential for injuries, and possible lost mining revenues. Many mines use instrumentation in critical infrastructure, such as haulage drifts, crusher stations, intersections, etc., to monitor the displacement of the backs and/or walls, support loads, etc. Data is generally collected by hand from time to time and entered into a database, but is analyzed only if there is a problem (i.e. reactive engineering). Most mines today also utilize numerical modelling. These models, normally linear-elastic, are often not up to date, and modelling is often done only in reaction to a problem.