An excavation of 10 m in soft clay is shown in the figure.Assuming the last level of strut is at GL-7.0 m, calculate thefactor of safety against inward yielding using the given soilproperties.10.0mGL-7.0m10.0m5.0m0.5m.9s 15 kPaSoft clay 1:Yt=20 kN/m³Cu=30kPaQu=0°Silty clay 2:Yt=20 kN/m³C₁ =90kPaQu=0°Bed Rock

Answered: An excavation of 10 m in soft clay is…

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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Determine the increase of pore water pressure at M due to the infinite strip loading shown in Figure Q3. Assume y= 0.5 and A-0.6. Im Clay 4m 2m 9-100kN/m² 4m Figure Q3 M G.W.T.
For the layered soil shown in the figure, H1 = 5 m, H2 = 5 m, and H3 = 20 m. The soil densities are ρ1=2040kg/m3, ρ2=1940kg/m3, and ρ3′=1020kg/m3. What is the effective stress at the bottom of soil 3 when h' = 15 meters? CHOICES A. 142.7 kPa B. 150.1 kPa C. 163.8 kPa D. 136.8 kPa
Soil mechanics
Q4 A 0.7m long soil specimen is subject to a steady-state flow, as shown in Figure Q4. The saturated unit weight of the soil is 20 kN/m³. Determine the following: Water 0.3 m 0.8 m А 0.3 m Datum 0.4 m Y Figure Q4 a) Total head (m) at point A, B and C. b) Elevation head (m) at point A, B and C. c) Porewater pressure head (m) at point A, B and C.
(1) A well is drilling to the depth of 6000 m. Formation pore pressure can be expressed in equivalent mud weight is 1.50 g/cm' at the depth and changes in proportion to well depth. Also, overburden pressure gradient is 0.0245 MPa/m. Calculate: a. Pore pressure gradient at 6000 m, MPa/m. b.Pore pressure, psi, at 6000 m. c. Matrix stress gradient, MPa/m d.Matrix stress at 6000 m, MPa
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A soil profile shown is subjected to a load of 48 kN/m2 at the ground surface. The preconsolidation pressure of the clay Pc = 160 kPa. Determine the settlement of the clay layer caused by primary consolidation. Use Cs = 1/5 Cc. 48 kN/m2 ground surface 4m Sand Ys =16 kN/m³ ground water țablę 6m Y sat =18 kN/m³ Clay 3m 6m Ysat =19 kN/m³ Ans. 71 mm
Figure below shows a soil profile. The uniformly distributed load on the ground surface is Δσ. 2Given Δσ = 150 kN/m , compression index (Cc) for clay layer is 0.30, and recompression index (Cs) for clay layer is 0.06. Estimate the primary consolidation settlement if the clay is normally consolidated (NC).Given:H1 =2.5m,H2 =2.5m,andH3 =3.5m.Sand: γdry(sand) = 15 kN/m3; γsat(sand) = 18 kN/m3 Clay: γsat(clay) = 19 kN/m3; Initial void ratio for clay, e0 = 0.65
A soil profile is shown in the figure below. A uniformly distributed load, Δσ is applied at the ground surface equal to 100 kPa. Ao 100 kN/m2 2 m Yary = 14 kN/m Groundwater table 4 m Yat 18 kN/m Y 19 kN/m Void ratio, e 0.8 3.5 m LL- 40 Sand Clay What is the settlement (in mm) of the clay layer caused by primary consolidation if the clay has a preconsolidation pressure of 150 kPa? Report your answer to the nearest whole number. O 38 O none of the above O 68 O 190
Refer to Figure below. Estimate the primary consolidation settlement in the clay layer. Given: Δσ = 150 kN/m2; H1 = 3 m; H2 = 4 m; and H3= 5 m. Soil characteristics are as follows: • Sand: γdry = 15 kN/m3, γsat = 19 kN/m3 • Clay: LL = 65; e = 0.65; γsat = 18 kN/m3; ; Cs =1/6cc σʹc = 200 kN/m2
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4.An exploratory drill hole was made in a stiff saturated clay having a moisture content of 22% and Gs = 2.82 as shown in Figure 1.3. The sand layer underlying the clay was observed to be under artesian pressure. Water in the drill hole rose to a height of 8 m above the top of sand layer. If an open excavation is to be made in the clay, determine: a. The maximum depth of excavation before the bottom heaves. b. What would be the required height of water inside the cut in order to ensure a factor of safety of 2? Exploratory drill hole 12m 8m 4.5 m Saturated clay O Sand Figure 1.3.

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