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Title: Slopes in stiff-fissured clays and shales
Authors: University of California, Berkeley. College of Engineering. Office of Research Services.
Duncan, J. M. (James Michael)
Dunlop, Peter.
Keywords: Clays
Shear stress
Slope failure
Soil mechanics
Finite element method
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Contract Report
Abstract: The objective of this investigation was to review existing information concerning slope failures in stiff, fissured clays and shales, and to study the influence of lateral stresses on the stress conditions around excavated slopes. These studies, which were performed using the finite element method of analysis, show that the initial horizontal pressures have a considerable influence on the magnitudes of shear stresses following construction. Shear stresses around excavated slopes are much larger for conditions representative of heavily overconsolidated clays (high initial horizontal stresses) than for conditions representative of normally consolidated clays (low initial horizontal stresses). Shear stresses large enough to cause failure at some points may develop even when the factor of safety calculated by the ɸ = 0 method of analysis is much larger than unity. The higher the horizontal stresses before excavation, the higher the factor of safety corresponding to the development of local failure.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Contract Report

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