Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 9, Problem 9.8P
To determine
Find the factor of safety against heaving at point A.
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A 10-m-thick layer of stiff saturated clay is underlain by a layer of sand (Figure 9.28). The sand is under artesian pressure. A 5.75-m-deep cut is made in the clay. Determine the factor of safety against heaving at point A.
A retaining wall 8 m high supports a cohesionless soil having a dry density of 1600 kg/m^3, angle of shearing resistance is 33 degrees and void ratio of 0.68. The surface of the soil is horizontal and level with top of the wall. Neglect wall friction and use Rankine’s formula for active pressure of a cohesionless soil. Determine the value of earth thrust on the wall per meter length if the soil is dry.
a. 121 kN
b. 186 kN
c. 148 kN
d. 137 kN
determine the value of earth thrust on the wall if water level is 3.5 m below the surface.
a. 230 kN
b. 250 kN
c. 180 kN
d. 210 kN
find the height above the base of the wall where the thrust acts during the water logged condition.
a. 3.50 m
b. 2.67 m
c. 1.75 m
d. 2.25 m
A retaining wall with vertical back is 8 m. high. The density of top 3 m. of fill is 1.75 Mg/m³ and the angle of internal friction is 30°. For the lower 5 m. the values are 1.85 Mg/m³ and 35° respectively. There is a surcharge load on the horizontal surface of the fill equivalent to 1.2 Mg/m² uniformly distributed. Solve for the following questions below:
1. Find the magnitude of the thrust on the wall per linear meter if the fill is well drained.
2. Find the magnitude of the thrust on the wall per linear meter if the fill is waterlogged after a storm (Assume the saturated quantities of the two strata are 1.9 and 2.0 Mg/m³ respectively.)
3. Find the point of application of 5 points the thrust on the wall if the fill is waterlogged after a storm.
Chapter 9 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- SOLVE FOR THE LOCATION AND MAGNITUDE OF THE PASSIVE AND ACTIVE THRUST OF THE RETAINING WALL. Along the passive side, the soil has the following properties: unit weight: 16 kN/m3, cohesion = 30 KPa, angle of internal friction = 25 degrees. and along the active side: sand: unit weight = 15 KN/m3, angle of internal friction = 30 degrees, and for clay: dry unit weight = 16.5 KN/m3, saturated unit weight = 19 kn/m3 , unconfined compressive strength = 48 KPa, angle of inter friction is 25 degrees. The heightarrow_forwardA retaining wall supports a horizontal backfill that is composed of two types of soil First layer: 4.75 meters high, Unit weight of 16.35 kN/m^3, coefficient of active pressure of 0.295 Second layer: 5.38 meters high, Unit weight of 18.54 kN/m^3, coefficient of active pressure of 0.305 Determine the distance of the total active force measured from the bottom of the wallarrow_forwardA vertical wall is 8m high and it retains a fill material. The upper 2m of the fill has density of 2000kg/m^3, angle of friction is 20° and unit cohesion c=25Kpa on the horizontal surface of the fill. The lower layer of the fill is fully saturated and has a saturated density of 2100kg/m^3, angle of friction is 25° and unit cohesion c=20kpa. Calculate the thrust exerted on the retaining wall and the height of the resultant thrust above the base of retaining wall.arrow_forward
- A river bed consists of a layer of sand 8.25 m thick overlying impermeable rock; the depth of water is 2.50 m. A long cofferdam 5.50 m wide is formed by driving two lines of sheet piling to a depth of 6.00 m below the level of the river bed and excavation to a depth of 2.00 m below bed level is carried out within the cofferdam The water level within the cofferdam is kept at excavation level by pumping. Determine the factor of safety against failure by heaving adjacent to the face of the piling.arrow_forwarda retaining wall supports a horizontal backfill that is composed of two types of soil. first layer: 4.92 meters high, Unit weight of 16.29 kN/m^3, coefficient of active pressure of 0.296 second: 6.85 meters high, Unit weight of 18.31 kN/m^3, coefficient of active pressure of 0.302 determine the distance of the total active force measured from the bottom of the wallarrow_forwardCalculate the resultant force and its location from the base of the wall. Plot the variation of active and passive lateral pressures with depth for the soil profile shown in Figure 2.arrow_forward
- A retaining wall 9 m high supports a cohesionless sandy soil with its face vertical as shown in figure below. Find active earth pressure on the wall , Take Yw = 9.81kN / (m ^ 3)arrow_forwardThe bottom of a river is 9 m below the water surface. Underneath the bottom of the river is a layer of sand having a specific weight of 18 kN/m3. If the recorded pressure at the tunnel located at the bottom of the sand layer is 305 kPa, how thick is the sand layer?arrow_forwardA retaining wall supports a horizontal backfill that is composed of two types of soil. First layer: 4.27 meters high, Unit weight of 17.25 kN/m3, coefficient of active pressure of 0.286 Second layer: 6.27 meters high, Unit weight of 18.27 kN/m3, coefficient of active pressure of 0.309 Determine the distance of the total active force measured from the bottom of the wall. Round off to three decimal places.arrow_forward
- Refer to Problem 8.4. Using the flow net drawn, calculate the hydraulic uplift force at the base of the hydraulic structure per meter length ( measured along the axis of the structure).arrow_forwardA retaining wall has an overall height of 15 ft, a type 2 backfill material, and a backfill slope (beta) of 20 degrees Compute the horizontal active earth pressure Group of answer choices 1,740 lb/ft 300 lb/ft 5,625 lb/ft 4,500 lb/ftarrow_forwardEstimate the lateral earth pressure at a depth 20 ft (6.1 m) below the ground surface in a loose sand deposit. The wet unit weight of the sand is 115 pcf (19 kN/m3). What would the total lateral pressure be if the water table rose to the ground surface (in psf or kPa)?arrow_forward
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