Answered: The figure below shows a 20 m thick…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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The figure below shows a 20 m thick layer of normally consolidated clay (ϒ_t = 18.6 kN/m³) that is one-dimensionally loaded by Δσ_v = 60 kPa. The clay layer is below a 5 m thick layer of granular fill (ϒ_t = 19.6 kN/m³), and a dense, compacted glacial till underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 3.00 cm thick, doubly drained specimen from the middle of the clay layer. When the stress conditions from the field (including the Δσ_v = 60 kPa) are applied to this specimen, it takes 1.5 minutes for 60% average consolidation to occur.
a. From the lab test data, determine c_v for the soil.
b. Compute pore water pressure at 20 m depth 7 years after the Δσ_v is applied to the clay layer.

c. Compute the average degree of consolidation 7 years after Δσ_v application.

$The image illustrates a geological profile with three distinct layers and applied pressure at the surface. 1. **Surface Load**: - An external pressure of 60 kPa is applied at the surface. 2. **Layer 1: Granular Fill** - Depth: 5 meters - Unit Weight ($\gamma_t$): 19.6 kN/m³ 3. **Layer 2: Clay** - Depth: 20 meters (underlying the granular fill) - Unit Weight ($\gamma_t$): 18.6 kN/m³ 4. **Layer 3: Dense Glacial Till** - Foundation layer beneath the clay. The diagram includes vertical downward arrows indicating the applied pressure and a triangle symbol representing drainage or pore water pressure dissipation. The horizontal lines separate the soil layers, and the cross-hatched pattern indicates the dense glacial till at the bottom.$

Transcribed Image Text:The image illustrates a geological profile with three distinct layers and applied pressure at the surface. 1. **Surface Load**: - An external pressure of 60 kPa is applied at the surface. 2. **Layer 1: Granular Fill** - Depth: 5 meters - Unit Weight ($\gamma_t$): 19.6 kN/m³ 3. **Layer 2: Clay** - Depth: 20 meters (underlying the granular fill) - Unit Weight ($\gamma_t$): 18.6 kN/m³ 4. **Layer 3: Dense Glacial Till** - Foundation layer beneath the clay. The diagram includes vertical downward arrows indicating the applied pressure and a triangle symbol representing drainage or pore water pressure dissipation. The horizontal lines separate the soil layers, and the cross-hatched pattern indicates the dense glacial till at the bottom.

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