Question - 1: Points: 5 The soil profile at a site for a proposed parking garage is shown in Figure below. It consists o

[answerhappygod]

Question 1 Points 5 The Soil Profile At A Site For A Proposed Parking Garage Is Shown In Figure Below It Consists O 1 (65.1 KiB) Viewed 14 times

Question - 1: Points: 5 The soil profile at a site for a proposed parking garage is shown in Figure below. It consists of a 10.6 m think layer of fine sand that is underlain by a 2.40 m thick layer of over-consolidated clay. Below the clay is a deposit of coarse sand. The groundwater table was observed at a depth of 3.5 m below the ground surface. Assume the soil above the groundwater table to be saturated. In this problem the effect of capillarity is ignored. The specific gravity of solids (Gs) for the fine sand is 2.70 and its average void ratio (e) is 0.780. For the clay layer, GS = 2.68 and the moisture content is 45.8%. The results from a one-dimensional (oedometer) consolidation test on a sample of the same clay from the middle of the layer give a compression index (CC) of 0.265, a recompression index (Cr) of 0.050, and an over-consolidation ratio (OCR) of 2.5. The parking garage will impose a vertical stress increase of 150 kPa in the middle of the clay layer. Assume the unit weight of water to be 9.81 kN/m. a) First determine the average initial void ratio in the clay layer. b) Next determine the vertical effective stress at the center of the clay layer before applying the garage load. c) Then determine the pre-consolidation pressure d) Finally, using the information from parts (b) and (c), determine the average ultimate primary consolidation settlement (8) in millimeters. applied building load T3.5 m 10.6 m Fine sand layer Clay layer 2.4 m Impermeable layer Figure Solution