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SLOPE STABILIZATION AT KM 229 AND KM 701-703 OF THE ALASKA HIGHWAY: SITE CHALLENGES AND LESSONS LEARNED
Session: Infrastructure Performance in Cold Regions II / Performance des infrastructures en régions nordiques II
Jason Pellett, Tetra Tech EBA Inc. (Canada)
Andrew Horwood, Tetra Tech EBA Inc. (Canada)
The Alaska Highway (BC No. 97) traverses numerous areas of difficult, landslide-prone terrain across northern BC and the Yukon. Public Works and Government Services Canada retained Tetra Tech EBA Inc. to evaluate unstable slopes at km 229 and km 701-703 and to complete the design of stabilization works. At km 229, slope movements were occurring along a very weak sliding plane in glaciolacustrine clay. Stabilization works included a cut-off drain along the ditch and a series of counterfort drains below the road. Follow-up monitoring suggests the slope movements have slowed but not stopped. At km 701-703, three sections of the highway along the eastern shore of Muncho Lake had a dangerously narrow shoulder due to erosion and slumping of the shoulder material into the lake. Stabilization of these areas was successfully completed using wire-basket MSE walls. This paper discusses the site conditions, design of the stabilization works, construction challenges and other lessons learned.
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