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Lateral Earth Pressure and Retaining Walls

Lateral Earth Pressure and Retaining Walls

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Lateral Earth Pressure and Retaining Walls

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  1. Lateral Earth Pressureand Retaining Walls

  2. Vertical or near-vertical slopes of soil are supported by retaining walls, cantilever sheet-pile walls, sheet-pile bulkheads, braced cuts and other similar structures. dr. isamjardaneh / foundation engineering 61303 / 2010

  3. Vertical or near-vertical slopes of soil are supported by retaining walls, cantilever sheet-pile walls, sheet-pile bulkheads, braced cuts and other similar structures. dr. isam jardaneh / foundation engineering 61303 / 2010

  4. Vertical or near-vertical slopes of soil are supported by retaining walls, cantilever sheet-pile walls, sheet-pile bulkheads, braced cuts and other similar structures. dr. isam jardaneh / foundation engineering 61303 / 2010

  5. Lateral Earth Pressures dr. isam jardaneh / foundation engineering 61303 / 2010

  6. Tie rod Anchor Sheet pile Lateral Support In geotechnical engineering, it is often necessary to prevent lateral soil movements. Braced excavation Anchored sheet pile Cantilever retaining wall dr. isamjardaneh / foundation engineering 61303 / 2010

  7. Lateral Support We have to estimate the lateral soil pressures acting on these structures, to be able to design them. Soil nailing Gravity Retaining wall Reinforced earth wall dr. isam jardaneh / foundation engineering 61303 / 2010

  8. dr. isam jardaneh / foundation engineering 61303 / 2010

  9. Sheet Pile Sheet pile wall dr. isam jardaneh / foundation engineering 61303 / 2010

  10. Soil Nailing dr. isam jardaneh / foundation engineering 61303 / 2010

  11. Lateral Support Reinforced earth walls are increasingly becoming popular. dr. isam jardaneh / foundation engineering 61303 / 2010

  12. dr. isam jardaneh / foundation engineering 61303 / 2010

  13. dr. isam jardaneh / foundation engineering 61303 / 2010

  14. dr. isam jardaneh / foundation engineering 61303 / 2010

  15. dr. isam jardaneh / foundation engineering 61303 / 2010

  16. dr. isam jardaneh / foundation engineering 61303 / 2010

  17. dr. isam jardaneh / foundation engineering 61303 / 2010

  18. The proper design of those structures requires an estimation of lateral earth pressure. Lateral earth pressure is a function of several factors, such as: The type and amount of wall movement The shear strength parameters of the soil The unit weight of the soil The drainage conditions in the backfill dr. isam jardaneh / foundation engineering 61303 / 2010

  19. Nature of Lateral Earth Pressure dr. isam jardaneh / foundation engineering 61303 / 2010

  20. Passive At Rest Active dr. isam jardaneh / foundation engineering 61303 / 2010

  21. Lateral Earth Pressure Lateral earth pressure is a function of effective vertical stress dr. isam jardaneh / foundation engineering 61303 / 2010

  22. Ơh= f (Ơv)

  23. Ơh=kƠv K=coefficient of lateral earth pressure

  24. Lateral earth pressure is a function of effective vertical stress Lateral Earth Pressure at Rest dr. isam jardaneh / foundation engineering 61303 / 2010

  25. dr. isam jardaneh / foundation engineering 61303 / 2010

  26. Water Table dr. isam jardaneh / foundation engineering 61303 / 2010

  27. q γ1 H1 γ2 H2 γwH2 γ1H1 γ1H1 q γ2H2 K0 K0 K0 K0

  28. Ko = 1 - sinφ for NCC Ko = 0.95 - sinφ for NCC Ko = 0.4 + 0.007 (PI) for 0 > PI > 40 Ko = 0.46 + 0.001 (PI) for 40 > PI > 80 Ko = 0.19+0.233log(PI)

  29. Active Lateral Earth Pressure Wall moves away from the soil

  30. William John MacquornRankine 1820 – 1872 Scottish civil engineer, physicist and mathematician. He was a founding contributor to the science of thermodynamics, particularly focusing on the first of the three thermodynamic laws. Rankine developed a complete theory of the steam engine and indeed of all heat engines. He was an enthusiastic amateur singer, pianist and cellist who composed his own humorous songs. He was born in Edinburgh and died in Glasgow, a bachelor. Rankine's theory, developed in 1857

  31. Assumptions No friction between the backfill soil and retaining wall. Angle of friction(δ) = 0 Retaining wall is vertical Surface of backfill is horizontal

  32. Rankine Active Earth Pressure

  33. σ`a =Rankine Active earth pressure σ`0 = Effective vertical stress C = Cohesion Φ = Angle of internal friction Ka = Rankine active pressure coefficient Ka =(1 – sin φ)/(1+sinφ) =

  34. dr. isam jardaneh / foundation engineering 61303 / 2010

  35. Zc = depth at which pressure = zero Zc = depth of tensile cracks dr. isam jardaneh / foundation engineering 61303 / 2010

  36. dr. isam jardaneh / foundation engineering 61303 / 2010

  37. Example

  38. Example dr. isam jardaneh / foundation engineering 61303 / 2010

  39. dr. isam jardaneh / foundation engineering 61303 / 2010

  40. dr. isam jardaneh / foundation engineering 61303 / 2010

  41. dr. isam jardaneh / foundation engineering 61303 / 2010

  42. Use this dr. isam jardaneh / foundation engineering 61303 / 2010