Time left 2:58:46 Problem 6 (20 points): A soil profile consists of a clay layer and two sand layers; the clay layer is

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Time Left 2 58 46 Problem 6 20 Points A Soil Profile Consists Of A Clay Layer And Two Sand Layers The Clay Layer Is 1 (77.85 KiB) Viewed 35 times

Time Left 2 58 46 Problem 6 20 Points A Soil Profile Consists Of A Clay Layer And Two Sand Layers The Clay Layer Is 2 (50.58 KiB) Viewed 35 times

Time left 2:58:46 Problem 6 (20 points): A soil profile consists of a clay layer and two sand layers; the clay layer is "sandwiche two sand layers as shown below. A surcharge of q = 120 kN/m? 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 layer equals to 1.4 m2 year. Surcharge q 1 H = 10 m Sand, ya 16 kN/m * Groundwater table H-10 m Sand. 17 kN/m 10 m Clay, Yu 19 kN/m Voidrati Sand, 17 kN/m Sand S Clay Answer the following questions: a) Before the surcharge is applied, what is the hydrostatic pore woter pressure us at the middle of the clay layer? What is the effective stress at the middle of the day layer at this point Hydrostati pore water pressure karoundodecimal places
Time left 2:58:38 c) Before the surcharge is applied, what is the hydrostatic pore water pressure, wo at the middle of the clay loyer vota the effective stress at the middle of the clay layer at this point? Hydrostatic pore water pressure, uo = kPa (round to 2 decimal places) Effective stress at the middle of the clay layer = 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 ΚΡα 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 day 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? kPa Effective stress at the middle of the clay layer years. (round to 2 decimal places e) To reach 50% consolidation of the clay layer, it takes 96 fround to I decimal places f) The average degree of consolidation after 5 years