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The following figure shows a sandy soil ground. The surface angle of this ground is B. The water table is far below Point A. The friction angle of this soil is a function of the total unit weight of soil (kN/m?) and varies based on the following equation.
A 2-m thick of compacted soil of unit weight 20 kN/m3 will be placed on the top of the ground surface. Δσ y 14.0 kN/m3 3.0 m Sand Y 17.5 kN/m3 2.0 m 3.0m A Soft clay y= 13.5 kN/m3 6.0 m Medium clay y=15.0 kN/m3 B 4.0 m Bedrock a) Before placing the compacted soil, what are the overconsolidation ratios (OCR) for point A and B? b) When placing the compacted soil, what external load Ag would be? c)...
Figure 15.45 shows a gravity retaining wall retaining a granular (c' = 0) backfill. The same soil is present at the bottom of the wall and on the left. The unit weight and the friction angle of the backfill are 18.5 kN/m3 and 35°, respectively. The unit weight of concrete is 24.0 kN/m3. Determine the factors of safety with respect to overturning, sliding, and bearing capacity failure. Use Rankine earth pressure theory.
The following table shows the variation of the field standard penetration number (N60) in a sand deposit. The ground water table is located at a depth of 6m. The dry unit weight of sand from 0 to a depth of 6m is 20.6 kN/m3, use the suitable relationship to calculate the corrected standard penetration number. Also, use the suitable formula to calculate the soil friction angle.
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