Cover Image

Not for Sale

View/Hide Left Panel
Click for next page ( 101

The National Academies | 500 Fifth St. N.W. | Washington, D.C. 20001
Copyright © National Academy of Sciences. All rights reserved.
Terms of Use and Privacy Statement

Below are the first 10 and last 10 pages of uncorrected machine-read text (when available) of this chapter, followed by the top 30 algorithmically extracted key phrases from the chapter as a whole.
Intended to provide our own search engines and external engines with highly rich, chapter-representative searchable text on the opening pages of each chapter. Because it is UNCORRECTED material, please consider the following text as a useful but insufficient proxy for the authoritative book pages.

Do not use for reproduction, copying, pasting, or reading; exclusively for search engines.

OCR for page 100
100 Figure 8-3. Permanent seismic deformation charts (Makdisi and Seed, 1978). Figure 8-5 shows a median prediction sliding displacement 8.3 Proposed Design Methodology chart, normalized by kmax and D595, an earthquake duration parameter dependent on magnitude. For example, if ky/kmax = Two approaches for the seismic design of embankments 0.2, kmax = 0.4, D595 = 10 seconds, then u equals about 15 inches, and slopes are described in the previous section: (1) the limit equilibrium approach, and (2) displacement-based method. compared to about 6 inches (or 12 inches to achieve an 84 per- Both are relatively simple to use, and both involve essentially cent confidence level) for the recommended Newmark chart the same modeling effort. The advantage of the displacement- shown on Figure 7-18 of this report. This difference is rela- tively small considering the general accuracy of the Newmark method. Figure 8-4. Normalized MHEA for deep-seated slide surface vs. normalized fundamental period of slide Figure 8-5. Normalized sliding displacement mass (Bray and Rathje, 1998). (SCEC, 2002; modified from Bray and Rathje, 1998).