posted 10 months ago

posted 10 months ago

posted 11 months ago

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.

posted 11 months ago

posted 11 months ago

posted 11 months ago

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)

posted 11 months ago

\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 }

posted 11 months ago

(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 {. }

posted 11 months ago

posted 11 months ago

\text { b. Rankine's earth pressure theory. }