An investigation of the feasibility of a cutbank slope design method based on the analysis of natural slopes Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/db78tg38w

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  • The failure of cutbanks is a major problem encountered by those who construct low-cost roads in naturally forested residual soils. Attempts have been made to lessen the severity of failures by classifying certain soil areas as to their susceptibility to failure, in addition to bringing past design experience into play when approaching a new area. Failures are still common, however, and require extensive slide removal and maintenance. The purpose of this investigation was to determine if a better cutbank design technique might be evolved from an analysis of natural slopes, cuts made into those slopes, and failures that occurred because of cutting. Field data were collected on 79 slides that occurred in 34 cuts along approximately 10,800 feet of roadway. The roads were located in mountainous areas of the Western Cascades of Oregon. Soils of the area are residual types derived from the weathering of volcanic rocks. Weather of the area is predominantly marine type with little to no precipitation in the summer months, and heavy precipitation in the fall and winter months. Field data obtained were compared with a theory developed for failures in cuts made into natural slopes of residual soils. The theory was substantiated by the field data, and was used to develop design curves which predict the percentage reduction in the present number of slides.
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