Slope stability concerns whether a soil or rock slope can resist movement under the conditions considered for a project.
Definition
Slope stability evaluates whether a soil or rock slope can resist movement under specified conditions. An assessment may consider slope geometry, material properties, groundwater, loads near the slope, and construction stages. The result depends on the investigation data, analysis method, and assumptions about conditions, so it applies to a defined site and purpose. A change in grading, drainage, loading, or construction sequence may affect the evaluation. Slope stability is not the same as retaining wall design, though both may be relevant where ground levels differ. An analysis also does not replace observation or monitoring when those are part of the project plan. For owners, clear investigation limits and design criteria help define proposal scope, coordinate disciplines, and explain what the assessment covers. The ASCE resource provides a professional engineering context for project work.
How owners use it
- Define the slope geometry, groundwater assumptions, loads, and construction stages covered by a proposed assessment.
- Coordinate grading, drainage, retaining features, and nearby structures when evaluating slope conditions.
- Example: A 2-stage analysis covering 1 temporary and 1 final condition has 1 + 1 = 2 analyzed conditions.
- State the data limitations and conditions that would require the assessment to be revisited.
