... ABSTRACT : The prediction of in situ failure conditions has been a critical issue in rock engineering for decades. Various approaches have been developed and used to estimate the strength of rock media around openings at different scales. In this paper, the authors present a novel approach...

... in a geologic repository may have performance implications. The Discontinuous Deformation Analysis (DDA) computer code is extended to model earthquake effects on underground excavations in jointed rock media. In addition, the effects of uncertainties in rock joint characterization are incorporated...

.... The two dimensional deriva - tions are applied to predict tensile strengths, critical stress intensity factors, and failure envelopes for Pittsburgh coal at elevated temperatures. The applicability of the general results to other rock media is indicated. N The development of thermo...

..., Utah. These tests comprise Phase I in a program undertaken to explore methods for measuring the in-situ properties of rock media and determining the influence of these properties on structural design and on the propagation of stress waves through rock media. The objectives of the Phase I tests were...