Answer Happy

my question is : How would the calculation approach be differed, if i do not account for smear?
An engineer is planning to use vacuum preloading together with a 4-m high fill embankment to treat a 14-m thick soft clay layer, which is underlain by bedrock. His equipment and set up can achieve 85% vacuum (1 atmosphere - 100 kPa). Prefabricated vertical drains (100 mm by 5 mm) will be installed using a rectangular shape mandrel of 200 mm by080 mm. The drains will be installed prior to the preloading scheme and will fully penetrate the clay layer. The groundwater level is about 2 m above the top of the clay layer. Preliminary ground investigation works and laboratory tests yielded the following information to facilitate his design: Fill bulk unit weight = 20 kN/m² Clay initial void ratio = 2.5 bulk unit weight = 15 kN/m horizontal coefficient of consolidation, Ch = 3 m /yr vertical coefficient of consolidation, cv = 2 m /yr recompression index = 0.15 compression index = 1.1 overconsolidation ratio = 1.7 sensitivity = 10 C/Cc = 0.05 The engineer decides to install drains in a triangular pattern at 1.5 m spacing. If he accounts for smear but ignores vertical flow through the soil and well resistance of the drain in his design, what will be the estimated settlement of the marine clay layer 40 year after the commencement of preloading? (18)
An engineer is planning to use vacuum preloading together with a 4-m high fill embankment to treat a 14-m thick soft clay layer, which is underlain by bedrock. His equipment and set up can achieve 85% vacuum (1 atmosphere - 100 kPa). Prefabricated vertical drains (100 mm by 5 mm) will be installed using a rectangular shape mandrel of 200 mm by 80 mm. The drains will be installed prior to the preloading scheme and will fully penetrate the clay layer. The groundwater level is about 2 m above the top of the clay layer. Preliminary ground investigation works and laboratory tests yielded the following information to facilitate his design: Clay Fill initial void ratio = 2.5 bulk unit weight = 20 kN/m bulk unit weight -15 kN/m horizontal coefficient of consolidation, Ch = 3 m?/yr vertical coefficient of consolidation, Cv = 2 m/yr recompression index = 0.15 compression index = 1.1 overconsolidation ratio = 1.7 sensitivity = 10 C/Cc = 0.05
(a) The engineer decides to install drains in a triangular pattern at 1.5 m spacing. If he accounts for smear but ignores vertical flow through the soil and well resistance of the drain in his design, what will be the estimated settlement of the marine clay layer 40 year after the commencement of preloading? (18)