Abstract:

Reliable estimation of the in situ state of stress for underground mine design purposes is still a difficult problem due to the typically few measurements made, combined with variability in both orientation and magnitude of principal stresses between measurements. For the case of deep seismically active mines, this led to the investigation of seismic stress inversion as another source of stress field information. However, the method only produces partial stress tensor information of principal stress orientations and relative magnitudes. In order to remove this limitation and recover the full stress tensor, the relationships between principal stress components was investigated. Stress measurements from several mines in various locations have been analyzed to determine the relationships between principal stresses and their correspondence relative stress ratio (R value). The results showed that there is a relationship between Sigma₁/Sigma₂ and Sigma₂/Sigma₃ versus R. These relationships are site dependent and can be used to recover the full stress tensor using seismic stress inversion.

Biography of the presenter: Yousef holds a PhD in mining induced seismicity from Queen’s University and a master’s from Laurentian University. Yousef joined Vale as a Ground Control specialist in 2019. During this time, he has been involved in various aspects of ground control engineering, seismicity and rock mechanics. Yousef has worked with seismic data from some of the deepest hard rock underground mines in the world. He worked as a Mining/Geotechnical specialist at ESG Solutions and his projects have included seismic array design, system optimization, seismic source parameter and hazard analyses and re-entry protocols. Yousef is the founder of TVSeminars Inc. TVSeminars is a platform for delivering online mining/geotechnical seminars.

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Steve McKinnon