Abstract

Rock excavation was required for building expansions at the Minneapolis-St. Paul International Airport, resulting in an adjacent automobile parking ramp being supported on near-vertical rock cuts and on exposed rock columns. The parking ramp foundations consisted of straight shaft drilled piers bearing on and in the underlying Platteville limestone formation. After evaluating the available geological and geotechnical information, overall rock stability was assessed and possible failure mechanisms were reviewed. Naturally-occurring and man-made rock fractures and discontinuities were anticipated; therefore, the rock was reinforced during excavation by the installation of rock bolts.

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