I often see geotechnical reports that recommend upper limits on passive pressure, and I cannot find a good reason for this limit in the literature. It is often in relation to soldier pile walls where an equivalent passive fluid pressure is provided, for example; "allowable passive pressure of 250 psf per foot of depth up to a maximum of 4,000 psf". Any ideas on where this maximum limit comes from? Theoretically, I think the passive pressure should keep increasing with depth.
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