A frictionless wall shown in Figure Q4 is retaining a saturated soil during a foundation excavation. Neglect seepage effects. Yar = 21 kN/m Ø' = 28° 3m 5m Yut = 24 kN/m? Ø' - 31° Base Figure Q4 Calculate the active lateral earth pressure distribution with depth. Calculate the magnitude the active forces.
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- Calculate the active and passive earth pressures AND. determine the distance at which the net active and passive force will acting on the retaining wall Ya=19 kN /m3 - 34 c=3kp 2m 6=34 %3D Vd = 17.54kN/m3 8=32"; ċ=o %3D 1.5m %3D = 21. BkN/m3 V sat 8= 31; c'= o %3D 1.5m %3D Ysat = 22.lkN/m3 5 m 8=30;cioA square footing 3 m x 3 m is supporting an axial load of 650 kN. The weight of the soil is aasumed to be 17.32 kN/m^3. Compute the vertical stress increment due to this load at a depth of 1.5 m below the center of the footing using the influence coefficients method for points under uniformly loaded rectangular areas. a. 51.46 kPa b. 76.54 kPa c. 32.10 kPa d. 50.56 kPaA6 m high retaining wall retains 3 m of Soil 1 which overlays Soil 2 as shown in the figure. The water table is at the interface of the two sods. The tod properties the active earth pressure and hydrostatic pressure distributions are also shown in the figure. The magnitude of the active earth pressure at Point of the pressure distribution is Soil 1: e-0, -30° Y-17kN/m' 3 m 6 m Soil 2 e 10 kPa, -20° You 20 kN/m² + hydro- static O 17.0 kPa O 11.0 kPa Ⓒ25.0 kPa O 29,4 kPa
- Question 2 For the gravity retaining wall (concrete) shown in figure below; if the angle B has changed to be 80°, Ø1= 29°; and a = 5° use Coulomb's theory to calculate the horizontal and vertical components of the active earth pressure. %! Y-18.5 kN/m :-32 5.7 m 5m 283 m P. 75 2.167 m 1.5 m 1.53 m 0.8 m 0.22 m - 18 KN/m 0.3 m 0,8 m :-24 3.5 m 30 KN/m?A square footing 3 m x 3 m is supporting an axial load of 650 kN. The weight of the soil is aasumed to be 17.32 kN/m^3. Compute the total vertical stress increment due to the loads at a depth of 1.5 m below the center of the footing using the influence coefficients method for points under uniformly loaded rectangular areas. a.32.10 kPa b.51.46 kPa c.76.54 kPa d.50.56 kPa With FBDQ3 Determine the lateral earth force at rest per unit length of the retaining wall when ground water table is acting at 2m below ground surface and find out the location of the resultant force. Clay layer overlies sand layer. Details: Depth of Clay layer = 7 Depth of Sand layer = 4 Unit weight of clay kN/ m³ = 23 Unit weight of sand kN/ m3 = 2 Ø in both layers = 30 C = 0
- For the frictionless wall retaining a stratified soil and shown in Fig. E3.2, determine: (a) The active lateral earth pressure distribution with depth. (b) The passive lateral earth pressure distribution with depth. (c) The magnitude and location of the active and passive forces. (d) The resultant force. (e) The ratio of passive moment to active moment. 4,- 20 kPa d =250 Ysn=20 kNm d'= 30An embankment consists of clay fill for which c=25 kPa and angle of internal friction is 260 9from consolidated undrained test with pore pressure measurement) The weight of fill per unit volume is 18.64 kN/m3. Estimate the shear strength of the material on a horizontal plane at a point 20 m below the surface of the embankment. Include fbdFor the frictionless wall retaining a stratified soil and shown in Fig. E3.2, determine: (a) The active lateral earth pressure distribution with depth. (b) The passive lateral earth pressure distribution with depth. (c) The magnitude and location of the active and passive forces. (d) The resultant force. (e) The ratio of passive moment to active moment. 4,- 20 kPa =250 %3D Ysen=20 kN/m =300 HAm
- A retaining wall of height 10 m with clay backfill is shown in the figure (not to scale). Weight of the retaining wall is 5000 kN per m acting at 3.3 m from the toe of the retaining wall. The interface friction ER angle between base of the retaining wall and the base soil is 20. The depth of clay in front of the retaining wall is 2.0 m. The properties of the clay backfill and the clay placed in front of the retaining wall are the same. Assume that the tension crack is filled with water. Use Rankine's earth pressure theory. Take unit weight of water, Y = 9.81 kN/m³ YwB A 6.0m Ce 5.0 m 4An embankment consists of clay fill for which c=25 kPa and angle of internal friction is 260 9from consolidated undrained test with pore pressure measurement) The weight of fill per unit volume is 18.64 kN/m3. Compute the stress in kPa at depth of 20 m. a. 192.8 b. 62.5 c. 21.6 d. 372.8