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

Question

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)

Answer 1

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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)

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