Problem 6 (20 points): A soil profile consists of a clay layer and two sand layers; the clay layer is "sandwiched" betwe

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Problem 6 20 Points A Soil Profile Consists Of A Clay Layer And Two Sand Layers The Clay Layer Is Sandwiched Betwe 1 (386.85 KiB) Viewed 53 times

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Problem 6 (20 points): A soil profile consists of a clay layer and two sand layers; the clay layer is "sandwiched" between two sand layers as shown below. A surcharge of q = 120 kN/m2 is applied to the ground surface, which causes an increase of total stress (Ac) of approximately 120 kN/m2 in the clay layer from top to bottom. This loading in the clay layer, in turn, causes a consolidation of the clay layer. The coefficient of consolidation of the clay ayer equals to 1.4 m2 /year. Surcharge q H = 10 m Sand, Ya 16 kN/m2 Groundwater table H =10 m Sand, sat = 17 kN/m Clay, Ysat = 19 kN/m H = 10 m Void ratio = e Sand, Ysat = 17 kN/m Sand S Clay
a) Before the surcharge is applied, what is the hydrostatic pore water pressure, up at the middle of the clay layer? What is the effective stress at the middle of the clay layer at this point? Hydrostatic pore water pressure, uo = 380 kPa (round to 2 decimal places) Effective stress at the middle of the clay layer = 140 kPa b) Immediately after the surcharge is applied, what is the excess pore water pressure, Au, at the middle of the clay layer? What is the total pore water pressure at the middle of the clay layer at this point? The excess pore water pressure, Au = kPa Total pore water pressure at the middle of the clay layer = kPa (round to 2 decimal places) c) After the surcharge is applied, the consolidation of the clay layer begins. What is the excess pore water pressure, Au, at the middle of the clay layer at the end of consolidation? Excess pore water pressure, Au, at the middle of the clay layer at the end of consolidation = kPa d) What is the effective stress at the middle of the clay layer at the end of consolidation? Effective stress at the middle of the clay layer = kPa e) To reach 50% consolidation of the clay layer, it takes years. (round to 2 decimal places) f) The average degree of consolidation after 5 years = % (round to 1 decimal places)