A soil profile is shown in Figure Q3(b)(i). The groundwater level is located on the ground surface. The sand layer is under artesian pressure where the excess pore water pressure is 40 kN/m^2. (i) Calculate the total vertical stress, pore water pressure and effective vertical stress at the base of each layer. (ii)Determine the increment of the effective stress at the base of sand layer if the 1.5m height fill will be imposed on the ground surface. Note that, the density of the fill material is 1750 kg/m^3. (iii) The excavation will be made in the clay layer for the basement construction. Evaluate the stability of the soil from boiling or quick condition. The depth of the excavation is shown in Figure Q3(b)(ii). (iv)Propose the maximum depth of cut that can be made to avoid boiling or quick condition.
A soil profile is shown in Figure Q3(b)(i). The groundwater level is located on the ground surface. The sand layer is under artesian pressure where the excess pore water pressure is 40 kN/m^2. (i) Calculate the total vertical stress, pore water pressure and effective vertical stress at the base of each layer. (ii)Determine the increment of the effective stress at the base of sand layer if the 1.5m height fill will be imposed on the ground surface. Note that, the density of the fill material is 1750 kg/m^3. (iii) The excavation will be made in the clay layer for the basement construction. Evaluate the stability of the soil from boiling or quick condition. The depth of the excavation is shown in Figure Q3(b)(ii). (iv)Propose the maximum depth of cut that can be made to avoid boiling or quick condition.
Principles of Foundation Engineering (MindTap Course List)
8th Edition
ISBN:9781305081550
Author:Braja M. Das
Publisher:Braja M. Das
Chapter2: Geotechnical Properties Of Soil
Section: Chapter Questions
Problem 2.27P
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A soil profile is shown in Figure Q3(b)(i). The groundwater level is located on the ground surface. The sand layer is under artesian pressure where the excess pore water pressure is 40 kN/m^2.
(i) Calculate the total vertical stress, pore water pressure and effective vertical stress at the base of each layer.
(ii)Determine the increment of the effective stress at the base of sand layer if the 1.5m height fill will be imposed on the ground surface. Note that, the density of the fill material is 1750 kg/m^3.
(iii) The excavation will be made in the clay layer for the basement construction. Evaluate the stability of the soil from boiling or quick condition. The depth of the excavation is shown in Figure Q3(b)(ii).
(iv)Propose the maximum depth of cut that can be made to avoid boiling or quick condition.
Transcribed Image Text:Ground water table
Medium stiff clay
e = 1.32
Gs = 2.7
Useful equation:
4 m
(G,+e)Yw
Ysat =
1+e
Stiff clay
5 m
Ysat = 20 kN/m³
Sand
4 m
Ysat = 16 kN/m³
FIGURE Q3(b)(i): Soil profile
Transcribed Image Text:Medium stiff clay
e = 1.32
4 m
8 m
Gs = 2.7
Stiff clay
5 m
Ysat = 20 kN/m3
Sand
4 m
Ysat = 16 kN/m³
Figure Q3(b)(ii): Proposed excavation in clay layer
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