Assignment#5_Solution_W2022

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Feb 20, 2024

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LE/CIVL 3210 Geotechnical Engineering 1 Assignment 5 – Earth-retaining structures Date: March 27 th ,2022 Question # 1 . A retaining wall 5 m high was designed to stabilize a slope of 15o. The back of the wall is inclined 10o to the vertical and may be assumed to be rough, with δ = 20 o. The soil parameters are φ’ cs = 30o and ϒ sat = 17.5 kN/m3. After a flood, the groundwater level, which is usually below the base of the wall, rose to the surface. Calculate the lateral force on the wall. Neglect seepage effects.
LE/CIVL 3210 Geotechnical Engineering 2 Question # 2 . The figure below shows rigid walls of height Ho with different geometries. Sketch the distribution of lateral earth pressures on each wall; indicate the location and direction of the resultant lateral force. Show on your diagram what other forces act on the wall, for example, the weight of the wall (Ww) and the weight of the soil (Ws). You should consider two cases of soil –wall friction: (a) δ > 0 and (b) δ = 0.
LE/CIVL 3210 Geotechnical Engineering 3 Question # 3 . Which of the two walls in the figure below gives the larger horizontal force? (Show calculations.)
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LE/CIVL 3210 Geotechnical Engineering 4 Question # 4 . Determine the stability of the cantilever wall shown in the figure below (see next page) and sketch a drainage system to prevent buildup of porewater pressures behind the wall.
LE/CIVL 3210 Geotechnical Engineering 5
LE/CIVL 3210 Geotechnical Engineering 6 Question # 5. The drainage system of a cantilever wall shown in the figure below became blocked after a heavy rainstorm and the groundwater level, which was originally below the base, rose to 1.5 m below the surface. Determine the stability of the wall before and after the rainfall. Neglect seepage effects.
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LE/CIVL 3210 Geotechnical Engineering 7
LE/CIVL 3210 Geotechnical Engineering 8
LE/CIVL 3210 Geotechnical Engineering 9
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LE/CIVL 3210 Geotechnical Engineering 10
LE/CIVL 3210 Geotechnical Engineering 11 Question # 6. Determine the embedment depth, d, and maximum bending moment for the cantilever sheet pile wall shown in the figure below. Use the factored strength method (FSM) with F φ = 1.25.
LE/CIVL 3210 Geotechnical Engineering 12
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LE/CIVL 3210 Geotechnical Engineering 13

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