Journal
JOURNAL OF GEOTECHNICAL AND GEOENVIRONMENTAL ENGINEERING
Volume 143, Issue 5, Pages -Publisher
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)GT.1943-5606.0001615
Keywords
Landslide; Failure mechanism; Slope stability analysis; Light detection and ranging (LiDAR); Shear strength; Kinematics; Flow slide; Liquefaction
Funding
- Department of Civil and Environmental Engineering at the University of Illinois at UrbanaChampaign
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This paper describes investigation, testing, analysis, and slope history used to determine the two-phase failure mechanism involved in the 2014 landslide near Oso, Washington. The first phase involves a slide mass located above the frequent landslides in the lower portion of the slope and extends to near the slope crest. This slide mass had a large potential energy, which moved downslope, and pushed the water-filled colluvium that had accumulated along the slope toe across the valley, resulting in it flowing almost 1.5km. Evacuation of the Phase I slide mass left the upper portion of the slope unbuttressed and oversteepened, causing a second landslide (Phase II) but it primarily remained on the source slope because the back edge of the Phase I slide mass prevented further movement and the dense and unsaturated upper soils did not undergo a significant strength loss like the water-filled colluvium. (C) 2017 American Society of Civil Engineers.
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