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|Title:||Static and Seismic Stability of Cut Slopes in Terms of Reliability|
|Department / Program:||Civil Engineering|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|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.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1987.
|Date Available in IDEALS:||2014-12-15|
This item appears in the following Collection(s)
Dissertations and Theses - Civil and Environmental Engineering
Graduate Dissertations and Theses at Illinois
Graduate Theses and Dissertations at Illinois