What Is Seismic Design for Earth Retaining Systems?
Earth retaining (the 11.8's — the M-O's; the 1929) is designed for (the ΔPae's — the 0.5's; the kh's) via (the 1929's — the Mononobe's; the Okabe's) and (the 11.8's — the 0.5's; the MSE's). The design: the 11.8's (the 0.5's — the kh's; the 0.2's), the M-O's (the 1929's — the ΔPae's; the 1.5x's), the 0.5's (the 11.8's — the 0.5*SDS's; the 0.2's), and the MSE's (the 11.8's — the 0.5's; the kh's). The earth's — the M-O retained.
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The systems' scope
The cantilever (the 11.8's — the 6's; the 1929's), the MSE (the 11.8's — the 0.5's; the kh's), the gravity (the 11.8's — the 6's; the 1929's), the 6-foot (the 11.8's — the trigger's; the cantilever's — the gravity's), and the 1929 (the M-O's — the 100-year's; the 11.8's).
The 11.8's seismic
The 0.5*SDS (the kh's — the 11.8's; the 0.2's), the ΔPae (the 1.5x's — the static's; the M-O's), the 0.6H (the 0.67's — the ΔPae's; the 11.8's), the 1.1 (the 1.5's — the FS's; the seismic's), and the 1929 (the 100-year — the M-O's; the 11.8's).
Details
The MSE (the 0.5's — the 11.8's; the kh's), the 12-inch (the 11.8's — the drainage's; the 1-foot's), the 1.1 (the seismic's — the 1.5's; the FS's), the 1929 (the M-O's — the 11.8's; the 100-year's), and the 0.5*SDS (the 0.2's — the 11.8's; the kh's). The earth's — the 11.8's 0.5; the MSE's — the same kh.
The bottom line
Design earth retaining per ASCE 7 11.8 (kh = 0.5·SDS ≤0.2, Mononobe-Okabe 1929 ΔPae at 0.6H, seismic FS 1.1) — cantilever, gravity, and MSE walls 6 ft+ all use the same kh; 12-in drainage.
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