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Question 45698

posted 10 months ago

9. What would the FS for the potential failure surface shown above be if the soil's undrained shear strength were 50 kPa (instead of 100 kPa)? Answer: FS = 0.98

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Question 45697

posted 10 months ago

8., Find the factor of safety for the failure surface shown, below using the Swedish Slip Circle method. The scale is in meters (use a ruler). The center of the circle is denoted by the •. Answer: FS 1.9550

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Question 41461

posted 11 months ago

A site is underlain by two saturated soil layers over bedrock. The top layer is sand (6m thick) and the bottom layer is clay (8m thick). The sand has a friction angle of 38 degrees and the clay has a friction angle of 27 degrees and a pre consolidation stress of 200 kPa.
b. Calculate the lateral stress ratio of the clay using Mayne and Kulhawy's (1982) correlation.
a. Calculate the OCR of the clay.
с.Calculate the undrained shear strength of the clay using Mayne's (1980) correlation.

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Question 41459

posted 11 months ago

Point A is located 3 meters under the ground surface of a saturated site where the silty soil has unit weights = 20 and 21 kN/m³, friction angle = 37 degrees, lateral stress ratio = 0.5, and cohesion intercept3 kPa. Determine the highest vertical effective stress that point A can support while the horizontal effective stress remains constant. Answer 81.5 kPa.

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Question 41460

posted 11 months ago

Go through the reader's problem 7 and its solution, on pages 110 and 113, respectively. The peak undrained shear strength is determined in that problem. However, we seldom use the peak undrained strength for design, so find the critical state undrained strength of the soil using the data (curve) given.Answer s 30 kPa.

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Question 42147

posted 11 months ago

A retaining wall (frictionless) is shown in Figure 1.
igure 1.a) Plot the variation of active and passive lateral pressures with depth for somprofile shown in Fig.1 (6 marks)
b) Determine the force due to surcharge in passive side (2 marks)
c) Compute Total active force on the wall if the wall is 8m long (5 marks)
d) Evaluate the lateral stability of the wall by comparing the forces acting on the wall (5 marks)

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Question 42148

posted 11 months ago

A rectangle footing (Length 3.0m x Width 2.0m), subjected to a moment of (50+X) K Nm about an axis parallel to the length in addition to the vertical load 300KN, is located at a depth of 1.5m below the ground surface in sand The ground water level is 0.5m below the ground surface (see Figure 4).
\text { Assume for dense sand; }\left(\phi_{p}^{\prime}=30^{\circ}, \gamma_{b u l k}=18 \mathrm{kN} / \mathrm{m}^{3}, \gamma_{s a t}=21 \mathrm{kN} / \mathrm{m}^{3}, N_{q}=18.4, N_{\gamma}=16.06\right)
(a) Determine ultimate net bearing capacity of soil (7 marks)
(b) Determine the maximum allowable bearing capacity of soil for factor of safety of3.0 (2 marks)
(c) What is the maximum serviceable load (vertical) in the foundation to satisfy condițion 'h' above?
d) Site investigation revealed that the soil condition can also represent Clay in most of the other areas at the site. What is the suitable foundation width for Length=3m in Clay (short-term) to satisfy the same factor of safety (i.e. 3.0) for the maximum serviceable load calculated in part (c) with the same moment
(50+X) kNm about an axis parallel to the length? (Assume for clay,
S_{u}=85 \mathrm{kP} a, \gamma_{b u l k}=20 \mathrm{kN} / \mathrm{m}^{3}, \gamma_{s a t}=22 \mathrm{kN} / \mathrm{m}^{3} \text { and water table remains same location }

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Question 42149

posted 11 months ago

(a) Draw a diagram to show the given wall dimensions, relevant inclinations and thedirection of the active force on the wall. (2 marks)
(b) Calculate lateral force on the wall assuming the ground water table is at theground surface. (5 marks)
() After a flood, the ground water table rises 0.8 m above the wall top surface onboth sides of the wall. Calculate the lateral active force on the wall after theflood. (8 marks)
(d) If the weight of the wall is (200+ X) kN/m, is the wall safe against sliding afterflooding event? Please show your calculations. (7 marks)
Y csCSAssume no seepage effects.
A retaining wall .X m high was designed to stabilize a horizontal ground surface. The backof the wall is inclined 20° to vertical direction and can be assumed rough with interface
\text { friction angle of } x^{\circ} \text {. The soil parameters are } \phi=33^{\circ}, \gamma_{\text {trulk }}=19 \mathrm{kN} / \mathrm{m}^{3}, \gamma_{s a f}=21 \mathrm{kN} / \mathrm{m}^{3} \text {. }

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Question 42302

posted 11 months ago

It is required to design a cantilever retaining wall to retain a 5.0 m high sandy bac kfill. The consultant suggests the dimensions and soil properties shown in Figure P17.6 and requires that the wall be checked for stability with respect to sliding and overturning based on the active earth pressures determined using

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Question 42303

posted 11 months ago

\text { a. Coulomb's earth pressure theory }\left(\delta^{\prime}=24^{\circ}\right) \text {, and }
\text { b. Rankine's earth pressure theory. }

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