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INFINITE SLOPE ANALYSIS

INFINITE SLOPE ANALYSIS. THE SIMPLEST WAY TO MODEL LANDSLIDES!. GREATER THE NORMAL FORCE THE GREATER THE RESISTING FORCE. What is normal anyhow?. FRICTION AND COHESION. GRAVITY. NORMAL FORCE. AN EXAMPLE WHERE THE ASSUMPTIONS OF A PLANAR SLOPE ARE WELL MET. Driving Force -- Gravity.

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INFINITE SLOPE ANALYSIS

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  1. INFINITE SLOPE ANALYSIS THE SIMPLEST WAY TO MODEL LANDSLIDES!

  2. GREATER THE NORMAL FORCE THE GREATER THE RESISTING FORCE What is normal anyhow? FRICTION AND COHESION GRAVITY NORMAL FORCE

  3. AN EXAMPLE WHERE THE ASSUMPTIONS OF A PLANAR SLOPE ARE WELL MET

  4. Driving Force -- Gravity Driving Force h/cos  

  5. MOHR-COULOMB FAILURE CRITERIA

  6. Normal stress (kN/m2)

  7. Resisting Force -- Soil Strength Resisting Force h/cos 

  8. Factor of Safety F ≥ 1 Slope Stability F ≤ 1 Slope Instability

  9. Slide scars CLEARCUTTING AND LANDSLIDES

  10. Soil Strength Parameters(Selby, 1993)

  11. Effective Cohesion -- Vegetation Effects from Selby, 1993

  12. 100 Till o (c = 150 kpa,  = 33.5 ) 10 Sand Factor of Safety o (c = 1 kpa,  = 37 ) 25o slope 1 35o slope saturated 0.75 m slab 0.1 0 4 8 12 Effective Root Cohesion (kPa)

  13. Mechanics of Deforestation-Induced Erosion • Removal of trees; suppression of vegetation by grazing • Roots root or stumps are pulled • Cohesion in two to five years • Greatest effect on steep, sandy slopes • Consistent with geologic observations

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