Course Description

This presentation will discuss the stabilization of a 100-ft tall rock slope on the downstream side of a hydroelectric dam in Northeast Washington using post-tensioned tiebacks. The project challenges included limited site access, strict drill tolerances, rope access means and methods, equipment weight restrictions, abnormal rock face geometry, communication, and construction schedule. The presentation will include an overview of the design focusing on site access, geotechnical capacities and performance of the brecciated limestone, and tieback tolerances; exploratory rock coring and down the hole inspection to inspect fracture planes; and the use of near real-time 3D modeling to assess risk based on as-built information and to make field changes based on site observations and contractor requests.


Mike Senior, EIT (Senior Staff, Schnabel Engineering)

Webinar Curriculum

  Welcome to the Boundary Hydroelectric Dam: Stabilizing a 100 ft Rock Slope in Washington with Limited Access and Tight Construction Tolerances (1 PDH)
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