1 Slope Stability Failure Planes or Slip Surfaces Text section 14.9 and only. - ppt download

3 Slope Stability In slope stability analysis we determine the Factor of Safety as a ratio of resisting forces to driving forces F s = Resisting / Driving Theoretically, any slope with a Factor of Safety less than one will fail and any slope with a factor of safety greater than one will not. Design focuses on the soil parameters and geometry that will provide the maximum factor of safety. Sometimes, the analysis of an existing slope will be what is called a parametric study – that is establishing a factor of safety and performing an analysis that back calculates the strength parameters. The engineer will then determine his/her confidence level as to whether or not the soil has that strength through experience, lab, and/or field data.
1 Slope Stability Failure Planes or Slip Surfaces Text section 14.9 and only
2 Slope Stability In general you have: Driving Force – Weight of Slope Resisting Force – Strength of soil along slip surface Buttress at toe W c
Design focuses on the soil parameters and geometry that will provide the maximum factor of safety. Sometimes, the analysis of an existing slope will be what is called a parametric study – that is establishing a factor of safety and performing an analysis that back calculates the strength parameters. The engineer will then determine his/her confidence level as to whether or not the soil has that strength through experience, lab, and/or field data..
4 Slope Stability Example of Circular Slip Surface (from geoslope software) Circular slip surfaces often used in analysis as the most likely approximated shape of the failure surface
5 Slope Stability Non circular slip surfaces can also be analyzed
Now: W n sin α (driving) N= W n cos α T r = shear face = c’ + F ’ tan φ’ (resisting) W n sinα W n cos α α.
7 Slope Stability Performing this analysis on each slice and then summing the components from each slice F s = Σ (c L + W cos α tan φ) / Σ (W sin α )
8 Slope Stability This analysis is very conducive to a tabular solution WedgecφαLWW sin αc LW cos α tanφ8 + 9 F s = Σ (10) / Σ (7)
9 Slope Stability - Example Each box is 5’ x 5’ * = 120 pcf c = 300 psf φ = 32 o
10 Slope Stability - Example First, Find the areas for each slice A1 A2 A3 A4
11 Slope Stability WedgecφαLWW sin αc LW cos α tanφ F s = Σ (10) / Σ (7)

PPT - Slope Stability PowerPoint Presentation, free download - ID:751891

Ch10-Slope Stability Examples, PDF, Soil Mechanics

2022 Scientific Research in School by Barker College - Issuu

images./33/8194036/slides/slide_2.j

Frontiers Determining the Critical Slip Surface of Slope by Vector Sum Method Based on Strength Reduction Definition

PDF) Effects of Soil Properties and Slope Angle on Deformation and Stability of Cut Slopes

Three-Dimensional Slope Stability Analysis for Natural and Manmade Slopes: Developing a Limit Equilibrium Methodology and Software Package, PDF, Strength Of Materials

Download full text - European Laboratory for Structural Assessment

NHESS - Probabilistic landslide susceptibility analysis in tropical mountainous terrain using the physically based r.slope.stability model

Chapter 8 - Slope Stability and Protection - Pile Buck Magazine

Ocean Infinity Proposes New Search for MH370 « MH370 and Other Investigations