ABSTRACT

: In seismic prone regions, consideration of earthquake effects is an important aspect in designing underground civil structures, storage, and power stations. Also, potential earthquake effects on stability of underground openings that will be used for disposal of high-level waste 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 in the analysis. The analysis results indicate that DDA is appropriate for analyzing stability of underground excavations subjected to earthquakes taking into account the uncertainties in rock joint data.

1 INTRODUCTION

In seismic prone regions, consideration of earthquake effects is an important aspect for design of underground civil structures, storage, and power stations. Also, potential effects of earthquakes on stability of underground openings that will be used for disposal of high-level waste in a geologic repository may have implications for performance.

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