If in Example 9.7 the excavation will take 6 months and the structure will be completed in a further 18 months, determine the settlement to time relationship for the central point of the raft during the first 5 years. The clay has a cv value of 1.86 m2/year and the sandstone may be considered permeable.


The initial excess pore water pressure distribution will be roughly trapezoidal. The first step is to determine the values of excess pore pressures at the top and bottom of the clay layer (use Fig. 4.6).

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