a The figure shows a 6-m thick clay layer overlying an incompressible rock layer, and the groundwater is at the ground s

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A The Figure Shows A 6 M Thick Clay Layer Overlying An Incompressible Rock Layer And The Groundwater Is At The Ground S 1 (71.06 KiB) Viewed 67 times

a The figure shows a 6-m thick clay layer overlying an incompressible rock layer, and the groundwater is at the ground surface. A highway embankment is planned to be placed on the top of the clay layer, which will induce total stress of Ao = 180 kN/m². A site investigation and soil sampling were conducted to obtain undisturbed soil samples for consolidation tests. The table shows the consolidation test results. The soil specimen for the consolidation test has a thickness of Ho=25 mm, and an initial void ratio of eo =0.97. Answer the following questions: Plot the e-logP curve using Excel b. Determine the preconsoliation stress oc based on Casagrande's method (refer to the textbook for Casagrande's method) Determine the values of compression index C. and swell index Cs d. Calculate the total settlement induced by the highway embankment. (Hint: divide the clay layer into three sublayers, calculate the settlement for each sublayer, and then sum up to obtain the total settlement). The clay has a coefficient of consolidation C = 5 x10 cm-/s. Calculate the days required for the average degree of consolidation U = 90%. c. e. a - Δσ 프 Clay y = 20 kN/m en=0.97 6 m Δσ (kPa) 20 40 80 160 320 640 1280 320 80 Settlement (mm) 0.22 0.32 0.42 0.55 1.03 2.30 3.54 3.32 3.15 2.94 Rock 20