Abstract
An ultrasonic rock bolt sensing technology has been developed at the National Research Council of Canada and field-tested in a few production mines. The technology has demonstrated, in end-use applications, the ability to measure load change and deformation experienced by full-bodied rock bolts and provide early detection of rock bolt yield. Furthermore, when deployed in clusters, the instrumented rock bolts can serve as a network of ground condition sensors. This sensor network would enable timely detection of heavily stressed areas, allowing for reinforcement as needed to prevent miner casualties and costly production shutdowns due to ground support failures. By the same token, it could yield substantial cost savings in the implementation and maintenance of the ground support system by adapting the quantity of rock bolts in specific areas to the varying ground conditions on an as-needed basis. This approach minimizes the need for excessive bolting solely for safety concerns, optimizing resource use while ensuring ground stability. This presentation will offer an overview of representative results and highlight key challenges associated with large-scale deployments of the technology. Additionally, various strategies for implementing large-scale deployments will be discussed.