July/August 2023 - 14

COVER
STORY
Structural Aspects of the Stabilization of Ten Mile Slide
The British Columbia Ministry of Transportation and
Infrastructure recently completed a slope stabilization
project at the Ten Mile Slide on Highway 99, which is an
essential part of the road network connecting the British
Columbia coast with the interior of the province and which
connects the communities of Lillooet and Xaxli'p to the
regional services in the City of Kamloops. Approximately
1,600 vehicles travel this section of highway every day, and
about 20% of the traffic comprises heavy vehicles. A Canadian
National Railways (CN) line crosses the top of the slide and
was partially stabilized by the railway in an earlier project.
The landslide was first detected in 1988 and is estimated
to have regressed more than 250 m (800 ft) upslope in the last
40 years. Historical monitoring and remote sensing data
14 * DEEP FOUNDATIONS * JULY/AUG 2023
AUTHORS
shows that the landslide has moved at average rates ranging
from 1.1-3.7 m (3.6-12.1 ft) per year. By late 2016, this section
of highway was the most expensive, challenging and
technically complex site in the province for the ministry to
maintain, and was subject to 50% load restrictions with 24hour
flagging to maintain single lane alternating traffic. Slide
width has remained stagnant at the highway.
Ten Mile Slide is the active portion of the Tunnel Earthflow,
a geological feature that is 1.5 km (1 mi) long and contains about
13 million m3 (460 million cu ft) of soil materials. The active
slide is about 300 m (1,000 ft) long and 200 m (700 ft) wide and
has an average depth to the shear zone of 18 m (60 ft). Prior to
stabilization, the moving mass comprised about 1 million m3
(35.3 million cu ft) of soil material. Prior to stabilization, the
Adrian Gygax, P.Eng., Gygax Engineering Associates, Rod Kostaschuk, P.Eng., BGC Engineering, and Sarah Gaib, P.Eng., Ministry of
Transportation and Infrastructure

July/August 2023

Table of Contents for the Digital Edition of July/August 2023

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July/August 2023 - Intro
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July/August 2023 - TOC
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