The soil at a site consists of a 30-m-thick deposit of clay.

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The soil at a site consists of a 30-m-thick deposit of clay. At a depth of 6 m and below, it is normally consolidated. A

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The soil at a site consists of a 30-m-thick deposit of clay. At a depth of 6 m and below, it is normally consolidated. A soil sample from this depth was tested in a direct simple shear (DSS) apparatus. The DSS gave a normalized undrained shear strength of c (ssurzo )f d DSS 5 0.22, where the subscript f denotes failure (critical state). The average saturated unit weight is 19.8 kN/m3. Groundwater level is at the surface. From Chapter 11, the normalized undrained shear strength is given by the equation c (ssurzo )f d DSS 5 !3 sin 2 frcs aOC2 Rb0.8. (a) Plot the variation of undrained shear strength with depth up to a depth of 30 m. (b) Estimate the allowable load capacity for a steel closed-ended pipe pile of diameter 1.5 m, length 15 m, and wall thickness 65 mm driven with a driving shoe (displacement pile). Assume FS 5 2.

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