1 a soil profile at a site consists of 45 m of sandy fill 91 m of soft
1. A soil profile at a site consists of 4.5 m of sandy fill, 9.1 m of soft clay, 3.6 m of dense sand,and 4.5 m of stiff clay (see soil properties given below). The water table is at a depth of1.5 m. A temporary wall which supports an excavation made to a depth of 21.7 m will be constructed and allowed to yield sufficiently to achieve the full active earth pressure state,because lateral movements at the site are not a concern. (a) Estimate via Rankine active earth pressure theory the lateral earth and water pressures(and then the total resultant force) acting on the wall. Do this by first drawing a Rankine active pressure diagram and show the earth and water pressures separately, if appropriate. (b) Eventually, the wall will be used to resist lateral forces resulting from the construction procedure adopted on this project, which will push the wall back into the soil. Although it is not likely that the applied construction lateral forces will push the wall into the soil and cause excessive deformations, the project engineer has asked you to check this by calculating the full passive earth and water pressures acting laterally on the wall to a depth of 21.7 m via Rankine passive earth pressure theory. Again, assume short-term(undrained) loading of the soil, and give your answer as a lateral pressure diagram as done for part (a) and give the magnitude of the total resultant force.
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