Despite its importance in engineering design, there remains significant uncertainty in determining in situ stress conditions, especially with respect to estimating stress magnitude. This is particularly true in deep borehole investigations, where borehole imaging techniques and the analysis of borehole breakouts, are commonly used to estimate the in situ stress conditions. Significant research has focused on the stress path and damage around tunnels in order to predict damage and spalling behaviour, but little has been done to model the stress path around a borehole for the purpose of determining the impact on in situ stress estimation.

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