Ultra-high resolution four dimensional geodetic imaging of engineered structures for stability assessment

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Abstract

We used ground-based Tripod LiDAR (T-LiDAR) to assess the stability of two engineered structures: a bridge spanning the San Andreas fault following the M6.0 Parkfield earthquake in Central California and a newly built coastal breakwater located at the Kaumālapa`u Harbor Lana'i, Hawaii. In the 10 weeks following the earthquake, we found that the surface under the bridge shifted 7.1 cm with an additional 2.6 cm of motion in the subsequent 13 weeks, which deflected the bridge's northern I-beam support 4.3 cm and 2.1 respectively; the bridge integrity remained intact. T-LiDAR imagery was collected after the completion of armored breakwater with 817 35-ton interlocking concrete armor units, Core-Locs®, in the summers of 2007, 2008 and 2010. We found a wide range of motion of individual Core-Locs, from a few centimeters to >110 cm along the ocean side of the breakwater, with lesser movement along the harbor side.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Ultra-high resolution four dimensional geodetic imaging of engineered structures for stability assessment
DOI 10.1061/9780784412121.305
Year Published 2012
Language English
Publisher ASCE
Contributing office(s) Western Geographic Science Center
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title GeoCongress 2012