Fundamentals of Geotechnical Engineering (MindTap Course List)
Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 14, Problem 14.2P
To determine

Find the magnitude and location of the thrust on the wall.

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The following concrete gravity wall of 7 m in height retains a sandy backfill. A sand sample from the backfill was brought to the laboratory and tested in a direct shear device under a normal stress of 100 kPa and failure occurred at a shear stress level of 63.4 kPa. Using the Rankine theory, determine the total active earth pressure at the base of the wall when: a) the backfill is dry, b) the backfill is partially submerged in water for a water level at 3.5m from the base of the wall, c) the backfill is fully submerged in water, which means the water table is at the ground surface. Notes: - The saturated unit weight of the soil is 19 kN/m³ -The moist unit weight of the soil is 17 kN/m³ - The dry unit weight of the soil is 15 kN/m³ Summarize your results in this table: b) Total active earth pressure at the base of the wall (kPa)
3.9 Figure P3.3 shows the plan of a loaded area on the surface of a clay layer. The uniformly distributed vertical loads on the area are also shown. Determine the vertical stress increase at A and B due to the loaded area. A and B are located at a depth of 3m below the ground surface. Uniformly distributed vertical load 4₂ = 200 kN/m² ר 2 m 3 m PLAN Uniformly 3 m distributed load on a flexible arca a.~100 kN/m²
Q3/ Determine the increase in vertical stress at (2.0) m below point (A) due to a surface load shown in Fig.(1), Q4/ In tu 6 m 2 m 2m 6m Aq=175 kN/m² Aq= 100 kN/m² Fig. (1) Jab
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