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Thin spray-on liners : assessment of support performance under dynamic loading conditions

University of British Columbia

The effectiveness of ground support systems under dynamic loading conditions is of prime interest to the mining industry for the successful and safe operation of deep mining operations. All ground support systems must have static capacity to provide stability against gravity induced failure mechanisms. However, to ensure excavation stability and safety in seismically active areas and in blasting environments, the support system must also offer dynamic capacity. A method of measuring and quantifying the dynamic capacity of ground support systems has yet to be established. There have been some attempts at measuring dynamic capacity in a laboratory setting, however very little information exists on large-scale in-situ testing programs. Proposed within this thesis is a large-scale dynamic load test methodology and analysis technique. The focus of this large-scale dynamic load test program was to collect support performance data specific to thin spray-on liners (TSLs), as it pertains to dynamic loading. To fully examine support performance, multiple data types were collected throughout the testing program. The integration of the various data types and formats required a unique analysis process, from which the dynamic limit of five ground support systems was defined. The definition of the dynamic limit allows for an improved underground support design in areas of anticipated seismicity. With the availability of dynamic load capacity data, a refinement of the support design for TSL systems in underground excavations was possible. The CRRP (Canadian Rockburst Research Program) have proposed a support design guideline for dynamic loading conditions. Additionally, Espley and Kaiser have developed a unique support design guideline specific to TSLs. The author expanded the existing TSL support design proposed by Espley and Kaiser by including a dynamic loading component. Through integration of the design principles proposed in the CRRP with the existing TSL design guideline, an improved TSL support design process was generated.

Text

2010-01-12

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http://hdl.handle.net/2429/18089

Mining Engineering

University of British Columbia

UBCV

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