A 4 m wall retains a dry sand backfill with a unit weight of 18.3 kN/m°, an angle of internal friction of 36° and a porosity of 31%. The backfill is fully drained through weep holes. 1) What is the magnitude of the backfill force on a 1 m wide slice of wall if it deflect? not allowed to 2) What is the magnitude of the backfill force on the same 1 m wide slice, if the wall does deflect enough to develop a Rankine active earth pressure condition? 3) What is the new force on the wall, and its location from its heel, if the wall's weep holes are clogged and the water table now rises to within 1 m of the ground surface behind the wall? a h= 4 m F3 F4

A 4 m wall retains a dry sand backfill with a unit weight of 18.3 kN/m°, an angle of internal friction of 36° and a porosity of 31%. The backfill is fully drained through weep holes. 1) What is the magnitude of the backfill force on a 1 m wide slice of wall if it deflect? not allowed to 2) What is the magnitude of the backfill force on the same 1 m wide slice, if the wall does deflect enough to develop a Rankine active earth pressure condition? 3) What is the new force on the wall, and its location from its heel, if the wall's weep holes are clogged and the water table now rises to within 1 m of the ground surface behind the wall? a h= 4 m F3 F4

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter13: Lateral Earth Pressure: At-rest, Rankine, And Coulomb

Section: Chapter Questions

Problem 13.21P

See similar textbooks

Similar questions

A 6 m high retaining wall is to support a soil with a unit weight of 17.4 kN/m3, soil friction angle of 26° and cohesion of 14.36 kN/m2. Determine the Rankine active force per unit length of the wall before the tensile crack. Determine the Rankine active force per unit length of the wall after the tensile crack occurs. Determine the location of the active force after the tensile crack occurs.
2. Figure 2 shows a non-yielding vertical wall retaining a sandy backfill underlain by clay. Determine the magnitude of the resultant at-rest force per unit length on the wallI, Pa Sand y= 18 kN/m d'= 34", e 0 OCR = 2 4m G.W.T 2 m Clay Yu=19 kN/m LL = 36, PL = 14. OCR = 3 Figure 2
Given the height of the retaining wall, H is 6.4 m; the backfill is a saturated clay with f 5 08, c 5 30.2 kN/m2 , gsat 5 17.76 kN/m3 , a. Determine the Rankine active pressure distribution diagram behind the wall. b. Determine the depth of the tensile crack, zc. c. Estimate the Rankine active force per foot length of the wall before and after the occurrence of the tensile crack.
A 4m high vertical wall supports a saturated cohesive soil φ = 0 withhorizontal surface. The top 2.5m of the backfill has bulk density of 17.6kN/m3 and apparent cohesion of 15 kN/m2 The bulk density and apparent cohesion of the bottom 1.5 m is 19.2 kN/m3 and 20 kN/m2 respectively. If tension cracks develop, what would be the total active pressure on the wall? Also draw the pressure distribution diagram
A retaining wall 6m high retains sand with φ = 30° and unit weight24kN/m3 upto the depth of 3 m from top. From 3 m to 6 m the material is cohesive soil with c = 20kN/m2 and φ = 20°. Unit weight of cohesivesoil is 18 kN/m3 A uniform surcharge of 100 kN/m2 acts on top of thesoil determine the total lateral pressure acting on the wall and its pointsof application.
A counterfort wall of 12 m height retains non –cohesive backfill. The void ratio and angle of internal friction of the backfill are 0.85 and 35 degrees in loose state and 0.35 and 45 degrees in the dense state. Assume Gs = 2.70.1. The ratio passive pressure and active pressure at loose state is: a. 16.25b. 13.62c. 9.47d. 7.562. The ratio of passive pressure and active pressure at dense state is: a. 42.15b. 29.15c. 33.97d. 25.11
A frictionless vertical retaining wall has a height of 4 m. and retains a horizontal surcharge of 10 kPa. Unit weight of the backfill is 15 kN/m3 with a cohesion of 8 kN/m2 and an angle of friction of 26°.• Compute the max depth of the tensile crack.• Compute the active force after the tensile crack occurs.• Compute the passive resistance per unit width of the wall.
An 8 m tall retaining wall holds cohesionless sand with a density and angle of internal friction of 1.85 Mg/m3 and 33°, respectively. If the surface of the backfill slopes upwards at 86° to the vertical, Use Rankine’s conditions to find the force per unit length of the wall and its location for (a) Active State (b) Passive State Please draw the pressure diagram neatly for both cases
Q1/ In Fig. 1 a retaining wall has a vertical back and is 8 m high. Determine the magnitude and the location the resultant of active force per unit meter with plot the diagram of active earth pressure. Neglecting the effect of wall friction. plot the diagram of active earth pressure Surcharge 30 kN/m2 Sand Y = 17 kN/m2 $ = 30° 3 m W.T. Sand 7= 20 k/m2 5 m $ = 35°
3. Compute the resultant lateral force for the soil-wall system shown in Figure 3. You may ignore tensile cracks. Use • A- Coloumb • B - Rankine 0=30°, y=20kN/m³ 4m Ground water table 7m c=50KN/m², p=10°, y=18KN/m³ 0=25°, y=20KN/m³ 8 m Gravity wall Figure 3
A retaining wall supports a horizontal backfill that is composed of two types of soil. First layer: 4.84 meters high, Unit weight of 17.36 kN/m3, coefficient of active pressure of 0.285 Second layer: 5.68 meters high, Unit weight of 18.9 kN/m3, coefficient of active pressure of 0.307 Determine the distance of the total active force measured from the bottom of the wall. Round off to three decimal places.
Figure Question 2 depicts the design of a gravity retaining wall for carthquake condition given: Kv-0 and Kh-0.37 What should be the weight of the wall for a zero-displacement condition? Use a factor of safety of 2.4. What should be the weight of the wall for an allowable displacement of 50.95 mm? Sand $:= 35° %3D Sand $=37 3. Figure Question 2 B Give a comprehensive detail on how to analyze a retaining wall