Answered: Q1 A clay layer of 4 m in thickness…

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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GWT
GWT
after
4 m
before
1 m
|4 m
Sand
1 m
4 m
Clay
3 m
Sand
Figure Q1: Upward flow of water through a layer of sand in a tank

Transcribed Image Text:Q1 A clay layer of 4 m in thickness lies between two layers of sand as shown in Figure Q1. The upper sand layer is 4 m in thickness and the lower sand layer is 3 m. The ground level is at top of upper sand layer. Although the ground water level is at 3 m below the ground level, the piezometric pressure of the lower sand layer is 4 m above the ground level. The saturated unit weight of the clay is 20 kN/m3. The saturated unit weight and the unit weight above the ground water level are 19 kN/m3 and 16 kN/m3 for both sand layers. Over a short period of time the ground water level rises by 2 m and is expected to remain permanently at this new level. Determine the total and effective stresses, and pore pressure distribution along the soil profile: (a) Before the rise of water table. (b) Immediately after the rise of the water table. (c) In long term (Assume piezometric level is constant).

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