At last month’s Earth Retention Conference, ER2010, there were many references to the second ER conference in 1990. One paper from that proceedings that garnered many mentions and was referenced by several at this year’s conference as a seminal paper was by Dr. G. Wayne Clough and Thomas D. O’Rourke entitled ‘Construction induced movement of insitu walls‘. I found it somewhat poetic that a recent issue of Geocomp’s newsletter described the monitoring of deformations of the temporary shoring for the Clough Undergraduate Learning Commons at the Georgia Institute of Technology (Georgia Tech). Geocomp performed the monitoring using multiple Leica automated motorized total stations (AMTS) with reflective prism targets along with their iSiteCentral software to ensure no deformation-induced damage to the adjacent historic library structure. [Source: Geocomp Newsletter. Image: Geocomp]
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City of Vancouver sues over failed shoring
The City of Vancouver is suing a developer, excavation contractor and their consulting engineer for the costs of repairs, overtime for city employees and lost revenue from parking meters etc stemming from an apparent failure of a shoring system that formed a 30-meter sinkhole. No mention of the developer’s name or the engineer, but the contractor was Matcon Excavation and Shoring. The site will be the future home of high-rise condominiums…if the City lifts it’s stop work order.
The failure of the shoring caused a break inf a 20-cm water main ultimately flooding the site. It also necessitated the closure of the adjacent street. Of course this invites the whole chicken or the egg scenario. The defendants will probably argue that the water line failed first causing the failure of the shoring, but of course the City Engineer, Tom Timm was not shy about fingering the shoring as being deficient.
"It’s some kind of a failure of the shoring system . . . either a design issue or the way it was put in place."