Lecture 32 - EP41 Effect of Wall Movement Y o A small...

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EP41 Effect of Wall Movement o A small amount of wall movement (soil strain) is required to bring the soil to either the active or passive condition. If the movement is insufficient then a different lateral pressure will develop, less for the passive condition and more for the active condition. o The chart at right (from NAVFAC DM7) shows experimental results in granular soils by Terzaghi (1920’s) and at Princeton. Terzaghi measured thrust very close to the theoretical estimate. He also found movement at the wall top of about Y/H = 0.001 (0.06°), where Y = movement and H = wall height. (example: if H = 10' = 120" then Y = 0.001H = 0.12") o Therefore, a small amount of rotation of a retaining wall is normal and expected, for both the active and the passive case. o The table below (from Das, 1998) provides values for the approximate wall rotation required to develop the active and passive states: Soil Type Active State Y/H Passive State, Y/H Loose Sand 0.001 - 0.002 0.01 Dense Sand 0.0005 – 0.001 0.005 Soft Clay 0.02 0.04 Stiff Clay 0.01 0.02 H Y P a
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This note was uploaded on 09/12/2011 for the course CEG 4012 taught by Professor Staff during the Fall '08 term at University of Florida.

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Lecture 32 - EP41 Effect of Wall Movement Y o A small...

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