Strain Distribution around Underground Openings. Comparison between Predicted and Measured Displacements
PURDUE UNIV LAFAYETTE IN SCHOOL OF CIVIL ENGINEERING
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The objective of this research was to establish whether existing theoretical methods could be used to predict the amount of displacement that would occur around an underground opening during or soon after the excavation process. The first step of the study selected a finite element method of analysis based upon an elastic continuum as the most promising theoretical method. The accuracy of the predictions was analyzed by comparison with in-situ measurements of strain around as-built openings. For three of the five openings analyzed, three appeared to present no useful correlation between the magnitudes of the predicted and measured displacements for two of the openings Morrow Point and Green River, 75 of the cases where the displacements were in the same direction had less than an order of magnitude difference in the amount of the displacement. In general, a finite element method based upon an elastic continuum does not appear to provide an acceptable predictive method except where the rock-system behavior approximates that of an elastic continuum.
- Geology, Geochemistry and Mineralogy
- Civil Engineering