Stress measurements at great depth at Craig-Onaping Mines, Sudbury, Canada

Rock Engineering 2009 - Rock Engineering in Difficult Conditions
Christopher Windsor, Luis Machuca, Brad Simser, Scott Carlisle,
Abstract Reliable estimation of in situ stress is a major step in the analysis and design of underground excavations in rock, particularly for evaluating the stability of underground structures to prevent failure or collapse. In the last ten years, the Western Australian School of Mines (WASM) has studied and developed an AE stress
measurement technique using orientated core named the WASM AE method (Villaescusa et al., 2002; 2003). It allows the determination of a representative and detailed knowledge of the in situ stress field during the early stages of a project (such as mine feasibility studies), even in areas where development access is not yet available (such as below current open pits). The method has been used for in situ stress measurement at more than 80 mine sites worldwide with over 200 individual stress measurements carried out to date. The paper describes the sample collection, sample testing and reconciliation of results for very deep measurements carried out at the Craig-Onaping mine complex in Sudbury Canada.
Keywords: stress measurement, Sudbury, Mining, great depth
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