A wide embankment applying a stress of 20 kPa is to he constructed across a floo

Question

A wide embankment applying a stress of 20 kPa is to he constructed across a flood plain. The underlying soil consists of 5 m of soft clay overlying a dense sand layer over rock. After 8 months a pavement is to be constructed on the embankment which applies a further stress of 10 kPa. To minimize the settlement of the pavement it is proposed to apply a surcharge of 20 kPa to the embankment for a period of 4 months. The proposed stress, time variation is shown in Figure 2. The clay has properties mv = 0.0025 m^2kN and cv = 3 m^2yr. Will the proposed pre-load strategy be successful? Investigate different strategies to improve the effectiveness of the pre-load, and show the effects of these strategies on the time, settlement responses, and how these influence the excess pore pressure distribution.

Explanation / Answer

S2015 = $2 million; A2015 = $1.5 million ; CL2015 = $0.5 million;

NP2015 = $0.2 million ; A/P2015 = $ 0.2 million ; Accruals2015 = $ 0.1 million;

PM = 5%; d = 60%; A*/S0 = 0.75.

          AFN = (A*/S0)S - (L*/S0)S - MS1(1 - d)

              = (0.75)S – ( 0.3 million / 2 million) S -(0.05)(S1)(0.40)

              = (0.75)S - (0.15 million )S - (0.02)S1

              = (0.6)S - (0.02)S1

              = 0.6(S1 - S0) - (0.02)S1

              = 0.6(S1 - $2 million) - (0.02)S1

              = 0.6S1 - $1.2 million - 0.02S1

   $1.2 million = 0.58S1

$ 2.068965517 million = S1.

Sales can increase $0.068965517 million i.e (68966) without additional funds needed.

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