Static and Seismic Stability of Cut Slopes in Terms of Reliability
Hayashi, Hiroshi
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https://hdl.handle.net/2142/69964
Description
Title
Static and Seismic Stability of Cut Slopes in Terms of Reliability
Author(s)
Hayashi, Hiroshi
Issue Date
1987
Department of Study
Civil Engineering
Discipline
Civil Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Civil
Abstract
A method is developed for evaluating the static stability of a cut slope formed by strain-softening soil such as highly overconsolidated clay considering progressive failure as the critical failure mode. The stress condition along a potential failure surface both prior to and after an excavation is investigated by finite-element elasto-plastic analysis; in this process, a potential failure surface is modeled as joint elements. Through the investigation, the redistribution of an unbalanced force caused by a local failure is determined. This stress redistribution is combined with the inherent variability of the shear strength of a soil, which is the main contributor to the uncertainties in the static stability evaluation of a cut slope, to determine the failure probability and the expected length of local failure along an assumed potential failure surface.
A method is developed for evaluating the seismic stability of a cut slope consisting of the following: (1) the horizontal vibration of a sliding mass subjected to an earthquake loading is converted into an equivalent SDF system with a smooth hysteretic restoring force; (2) a failure criterion and a damage index for the converted SDF system is established; and (3) the safety based on the response statistics obtained through random vibration analysis is evaluated. The reliability against sliding failure conditional on the intensity and duration of a loading was obtained using the results from the random vibration analysis; the uncertainties associated with several parameters including the dynamic soil properties and the randomness in the frequency content of an earthquake loading are considered.
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