1 / 94

DESIGN OF RETAINING WALL S

DESIGN OF RETAINING WALL S. Retaining Walls - Applications. highway. basement wall. Retaining Walls - Applications. High-rise building. Road Train. Retaining Walls - Applications. Metros and Subways. E. E. E. E. Tunnel. Dock. Abutment. RETAINING WALLS. TYPES. GRAVITY WALLS.

adarrell
Download Presentation

DESIGN OF RETAINING WALL S

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. DESIGN OF RETAINING WALLS

  2. Retaining Walls- Applications highway

  3. basement wall Retaining Walls- Applications High-rise building

  4. Road Train Retaining Walls- Applications Metros and Subways

  5. E E E E Tunnel Dock Abutment

  6. RETAINING WALLS TYPES GRAVITYWALLS

  7. RETAINING WALLS TYPES CANTILEVER

  8. RETAINING WALLS TYPES COUNTERFORT

  9. SIIT-Thammasat University RETAINING WALLS TYPES COUNTERFORT School of Civil Engineering-AIT

  10. SIIT-Thammasat University RETAINING WALLS TYPES BUTTRESS School of Civil Engineering-AIT

  11. SIIT-Thammasat University STEM or Wall Slab HEEL TOE KEY CANTILEVER RETAINING WALLS PARTS BACKFILL FRONT School of Civil Engineering-AIT

  12. Lateral Earth Pressure ?? (R.P. Weber) ?? (R.P. Weber)

  13. Water Pressure and Soil Pressure Consider “at-rest” (geostatic) condition Consider hydrostatic condition sz sx Anisotropic Isotropic sx sx ≠ > sz sz

  14. SIIT-Thammasat University y gy School of Civil Engineering-AIT

  15. SIIT-Thammasat University EARTH PRESSURES • PRESSURE AT REST • ACTIVE EARTH PRESSURE • PASSIVE EARTH PRESSURE School of Civil Engineering-AIT

  16. SIIT-Thammasat University PRESSURE AT REST RIGID School of Civil Engineering-AIT

  17. Lateral Earth Pressure z h At Rest Earth Pressure One common earth pressure coefficient for the “at rest” condition in granular soil is: Ko = 1 – sin(φ) Where: Ko is the “at rest” earth pressure coefficient and φ is the soil friction value. z K0z h/3 K0h

  18. SIIT-Thammasat University EARTH PRESSURES School of Civil Engineering-AIT

  19. Active Failure movement

  20. ACTIVE EARTH PRESSURE RANKINE ACTIVE EARTH PRESSURE 3 = 1 . tan2 (45-/2)-2c.tan (45-/2)

  21. RANKINE ACTIVE EARTH PRESSURE 3 = 1 . tan2 (45-/2)-2c.tan (45-/2) a = v . tan2 (45-/2)-2c.tan (45-/2) Ka = tan2 (45 - /2) a = v . Ka – 2cKa

  22. Active Stress Distribution (c ≠ 0) zo γ c ≠ 0 Φ dry soil H _ - = KaγH 2 c (Ka)1/2 KaγH – 2 c (Ka)1/2 Find zo: Kaγzo – 2 c (Ka)1/2 = 0 Zo = 2c / γ (Ka)1/2 Pa = ?

  23. ACTIVE EARTH PRESSURE Note : z = 0  v = 0 ; a = -2cKa z = H  v = H The tensile stress decreases with depth and becomes zero at a depth z = zc or zcKa – 2cKa = 0 and zc = depth of tensile crack

  24. ACTIVE EARTH PRESSURE RANKINE ACTIVE EARTH PRESSURE FOR INCLINED BACKFILL (for granular soil, c = 0) For c- soil

  25. SIIT-Thammasat University PASSIVE EARTH PRESSURE School of Civil Engineering-AIT

  26. Passive Failure movement

  27. PASSIVE EARTH PRESSURE RANKINE PASSIVE EARTH PRESSURE

  28. PASSIVE EARTH PRESSURE RANKINE PASSIVE EARTH PRESSURE p= v . tan2(45+/2) + 2c . tan (45+/2)

  29. PASSIVE EARTH PRESSURE RANKINE PASSIVE EARTH PRESSURE Kp = tan2 (45 + /2) h = v . Kp + 2cKp

  30. Passive Stress Distribution (c ≠ 0) γ c ≠ 0 Φ dry soil H + - = KpγH 2 c (Kp)1/2 KpγH + 2 c (Kp)1/2 h = v . Kp + 2cKp Pp = ? Kp = tan2 (45 + /2)

  31. Ka < K0< Kp

  32. Lateral Earth Pressure E Ep Eo Ea o -△ +△ △a △p -△ +△ Relation among three earth pressures

  33. Lateral Earth Pressure Example 1

  34. Lateral Earth Pressure A 1=17kN/m3 c1=0 1=34o h1=2m B h=5m 2=19kN/m3 c2=10kPa 2=16o h2=3m C Example 2

  35. Lateral Earth Pressure A h1=2m B h=5m h2=3m C Solution: 10.4kPa 4.2kPa 36.6kPa

  36. Active Stress Distribution (c = 0) γ c = 0 Φ dry soil H Pa = ? ? - What is this value σa‘ = Kaσv’ – 2 c (Ka)1/2 σa‘ = Kaσv’ 0 σa‘ is the stress distribution Pa is the force on the wall (per foot of wall) How is Pa found?

  37. Passive Stress Distribution (c = 0) γ c = 0 Φ dry soil H Pp = ? ? - What is this value σp‘ = Kpσv’ – 2 c (Kp)1/2 σp‘ = Kpσv’ 0 σp‘ is the stress distribution Pp is the force on the wall (per foot of wall) How is Pp found?

  38. Stress Distribution - Water Table (c = 0) Effective Stress H1 Pore Water Pressure Kaγ H1 H2 Pa Kaγ H1 Kaγ’ H2 γw H2 or Ka (γ H1 + γ’ H 2) Pa = Σ areas = ½ KaγH12 + Ka γH1H2 + ½ Kaγ’H22 + 1/2γwH22

More Related