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In: Civil Engineering

The soil profile at a site consists of a clay layer 10 m thick, sandwich between...

The soil profile at a site consists of a clay layer 10 m thick, sandwich between two sand layers. The top sand layer has a density of 1.9 Mg/m3 and is 5 m thick. Below this layer is a 10 m thick clay layer with a saturated density of 1.8 Mg/m3 and a saturated water content 42%. The deeper sand layer has a saturated density of 1.9 Mg/m3 and extend to the depth investigated at the site. The water table was detected at the top of the clay layer.

         The results of a consolidation test performed on a sample recovered from the mid point of the clay layer indicated the following properties for the clay:

  1. Effective pre-consolidation pressure of 130 kPa;
  2. Compression index Cc = 0.40;
  3. Re-compression index Cr = 0.03; and
  4. Consolidation coefficient Cv = 0.544 * 10-2 cm2/sec.

The site is being proposed to be graded by compacting an additional layer.

The new compacted layer will impose a total stress increment of 75 kPa on the present ground surface. It is desired to obtain the following information:

  1. Estimate the ultimate consolidation settlement due to grading;
  2. Estimate the time in weeks that it will take to reach the average degree of consolidation Uave= 90%; and
  3. At the time calculated in 2.), estimate the excess pore pressure still present at the mid-point of the clay layer.

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Ally Wells answered 11 months ago
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