Principles of Foundation Engineering
9th Edition
ISBN: 9780357684832
Author: Das
Publisher: Cengage Learning US
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Chapter 16, Problem 16.19P
To determine
Draw the variation of the lateral earth pressure with depth.
Find the resultant load.
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A single rectangular opening 10 ft (3.0 m) in height is driven in rock having strengths of fc = 18,000 lb/in2 (124 MPa) and ft=1500 lb/in2. (10.3 MPa).Rock specific gravity is 2.3.The opening is located at depth of 2000 ft (610 m) in a stress field of no lateral pressure and has a fillet ratio of h .a. Determine if the opening will fail when its width is 20 ft (6.1 m).b. Is there any benefit to reducing the width to 10 ft (3.0 m)? To 5 ft (1.5 m)?c. What is the maximum safe width of opening?
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The following figure shows a section of an anchored retaining wall embedded into a saturated stiff clay layer.
The sand has a unit weight of = 18 kN/m³, c' = 0 kPa and o' = 34º.
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Chapter 16 Solutions
Principles of Foundation Engineering
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Similar questions
- It was found that the backfill against a retaining wall (6 meters in height as shown in Figure 3) has specify weight y= 16 kN/m³ when its water content w= 5 %, S = 0.12, its internal friction angle was measured as 30° (take G,= 2.7 and xw = 10 kN/m³). a. Predict distribution of lateral stress on this retaining wall along its depth in its “at rest" state, and its resultant force. b. Rain leads the backfill water content increase to 10% in its upper half, and saturated in its lower half, find and plot its lateral stress and pore pressures along its depth in an active state.arrow_forwardDetermine the lateral earth pressure force on the wall (6.0 m height shown in the figure. Draw the stress distribution and locate the location of the resultant force. Sandy soil kN Ye = 20 O = 36.0°arrow_forwardSoil mechanicsarrow_forward
- A retaining wall supports a horizontal backfill that is composed of two types of soil. The first layer is 4.74 meters high. It has a unit weight of 17.25 kN/m3. The second layer is 6.6 meters and has a unit weight of 18.4 kN/m3. If the angle of friction for both layers is 32°, determine the total active force (kN) acting on the retaining wall per unit width. Use stored value. Answer in 5 decimal places.arrow_forward234 kPa 67.8 kPa 101 kPa 31° B 101 kPa 234 kPaarrow_forward7) A circular horizontal N_S tunnel of 2 m radius will be constructed at a depth of 560 m below surface as shown in Figure 1. The vertical stress gradient is found to be 0.025 MPa/m. The horizontal stresses in the north and east directions are on = 13 MPa and ge =14 MPA Estimate the radial and tangential stresses for = 0° and = 90° from the east axis. 560 m Narrow_forward
- Q2 A smooth backed wall is 6m height and retain a soil with the properties shown in the Figure below. If the soil surface carries a uniform distribution pressure of 50 kN/m*. Determine the total Rankine active stresses on the wall and its positions. q-50 kN/m? Sand y= 20 kN/m Ø' = 20°arrow_forwardProblem 3 Determine the increase in vertical stress at a depth of 2m in the soil below point A due to the foundation shown below. The load due to the foundation is 100 kN/m². A. 5m 2marrow_forwardA 5 m high retaining wall is supporting the soil having properties as shown below: 5m $ = 30° c = 10 kN/m² Y=17.5 kN/m 3 The Rankine active earth pressure (per meter length) on the wall after the formation of tensile crack isarrow_forward
- A retaining wall 6 m high with a vertical back face retains a homogeneous saturated soft clay. The saturated unit weight of the clay is 19.8 kN/m^3. Laboratory tests showed that the undrained shear strength, cu, of the clay is 14.7 kN/m^2. a. Do the necessary calculations and draw the variation of Rankine’s active pressure on the wall with depth. b. Find the depth up to which a tensile crack can occur. c. Determine the total active force per unit length of the wall before the tensile crack occurs. d. Determine the total active force per unit length of the wall after the tensile crack occurs. Also find the location of the resultant.arrow_forwardThanks for your workarrow_forwardPlot the vertical effective stress, the active Rankine lateral effective stress, the water pressure, and total pressures acting on the wall in the figure below. Also calculate the equivalent soil pressure, equivalent water pressure, and total equivalent pressure on the back of the wall and the location at which they act. Soil 1 Wall 1.5 m y=19 kN/m³ = 30° Soil 2 3 m y-20 kN/m³ -35° Soil 3 4 m 2.5 m y=21 kN/m³ = 38°arrow_forward
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