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• ♦Manual Notice 2006-1
• ►1. Manual Overview
  • ►1. About this Manual
    • ♦Purpose of the Manual
    • ♦Updates
    • ♦Organization
    • ♦Feedback
• ►2. Soil Surveys
  • ►1. Soil Surveys
    • ►Overview
• ►3. Field Operations
  • ►1. Drilling
    • ♦Overview
    • ♦Access
    • ►Utility Clearance
  • ►2. Sampling Methods
    • ♦Overview
  • ►3. Field Testing
    • ♦Texas Cone Penetration (TCP) Test
    • ♦Standard Penetration Test (SPT)
    • ♦In-Place Vane Shear Test
    • ♦Torvane and Pocket Penetrometer
• ►4. Soil and Bedrock Logging
  • ►1. Logging
    • ♦Material Order of Description
    • ♦Material
    • ♦Density or Consistency, Hardness
    • ♦Moisture
    • ♦Color
    • ♦Cementation
    • ♦Descriptive Adjectives
    • ♦Unified Soil Classification System (ASTM D2487)
    • ♦Rock Quality Designation (RQD)
    • ♦Log Form
• ►5. Foundation Design
  • ►1. Foundation Type Selection
    • ♦Foundation Selection Factors
    • ♦Foundation Guidelines for Widening Structures
  • ►2. Interpretation of Soil Data
    • ♦Overview
    • ♦Disregard Depth
    • ♦Texas Cone Penetration Test
    • ♦Laboratory Test
  • ►3. Drilled Shafts
    • ♦Overview
    • ♦Belled Shafts
    • ♦Standing Water
    • ♦Service Loads
    • ♦Layout Notes
  • ►4. Piling
    • ♦Overview
    • ♦Service Loads
  • ►5. Scour
    • ♦Analysis
• ►6. Retaining Walls
  • ►1. Retaining Wall Selection
    • ♦Overview
  • ►2. Retaining Wall Layouts
    • ►General Content Layout
  • ►3. Design Considerations
    • ♦General Design
    • ♦Design Criteria for Specific Wall Types
  • ►4. Excavation Support
    • ♦Overview
    • ♦Trench Excavation Protection
    • ♦Temporary Special Shoring
• ▼7. Slope Stability
  • ►1. Overview
    • ♦Overview
  • ▼2. Analysis and Design
    • ♦Global Stability Analysis
• ♦Index

Anchor: #CEGGCGHF

Section 2: Analysis and Design

Anchor: #i1009318

Global Stability Analysis

Use the following data to analyze global stability of a slope:

• Geometry (cross section and loading conditions)
• Location of the water table
• Soil/rock stratigraphy
• Soil/rock properties (unit, weight, Atterberg Limits, undrained and drained shear strength)

Experience has shown that the Plasticity Index (PI) of the soil is related to the long-term stability of exposed side slopes. The table below indicates the recommended upper limit on the Plasticity Index for various slope conditions to maintain a factor of safety of 1.3 for the long-term (drained) condition.