Abstract
This paper investigates the impact of the following five assumptions on the accuracy of Newmark seismic deformation analysis applied to geosynthetic cover systems: i) the potential failure mass is noncompliant; 22) the dynamic response of the potential failure mass is uncoupled from displacement (slip); iii) permanent displacements accumulate in only one direction; iv) vertical ground motions do not influence permanent displacement; and v) the yield acceleration is constant. Information presented in the literature indicates the impact of the assumption of a noncompliant failure mass and the assumption of a seismic response uncoupled from displacement is insignificant for typical geosynthetic cover systems. The results of computer analyses indicate that the effects of two-way sliding and vertical ground motions can, in most practical cases, be neglected. However, the assumption of a constant yield acceleration, when based on residual (or large displacement) shear strength, may result in calculated displacements that are significantly larger than those calculated using a yield acceleration that degrades with accumulated displacement from a peak value to a residual, or large displacement, value. Overall, results of this investigation indicate that conventional Newmark analyses based upon residual shear strength yield conservative results when applied to geosynthetic cover systems.
Original language | English (US) |
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Pages (from-to) | 237-264 |
Number of pages | 28 |
Journal | Geosynthetics International |
Volume | 5 |
Issue number | 1-2 |
DOIs | |
State | Published - 1998 |
Externally published | Yes |
ASJC Scopus subject areas
- Geotechnical Engineering and Engineering Geology