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Safety and efficiency of mining operations depend on the quality of design of mining excavations and
sequence. A crucial ingredient in mining design is the adequate information of both the original in situ stress
and the stress disturbance caused by mining. The main method of stress determination – the overcoring –
has a number of drawbacks. 1. It requires an open access to the location of the measurements, which is
especially difficult if the stress is to be measured ahead of deep underground excavation. 2. It presumes the
rock to be isotropic, while in many cases the rock anisotropy is significant. Subsequently, the isotropic stress
reconstruction procedure of the overcoring method can give erroneous stress magnitudes and directions
(e.g. Amadei and Goodman, 1982). The rock memory methods - DRA and the Kaiser effect are free from the
influence of anisotropy. Moreover the DRA technique can, in principle, provide as a by-product a sufficient
number of measurements to reconstruct the full anisotropic tensor of moduli, or compliances sufficient to
characterise rock anisotropy, introduce corrections to the overcoring stress reconstruction procedure and
quantify the effect of rock anisotropy on the stress concentrations induced by the excavation. In this paper,
we present the procedure for the anisotropy characterisation based on DRA and analyse the sensitivity of the
procedure and the effects of the rock anisotropy on stress measurements.
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Accounting for the Effect of Rock Mass Anisotropy in Stress Measurements P.M. Dight, A.V. Dyskin
424 Deep Mining 07, Perth, Australia