Strength Criteria
The days are gone when you needed a program to analyze soil slopes and another to analyze rock slopes - GALENA provides you with both the
Mohr-Coulomb and Hoek-Brown criteria for definition of material property strengths so you can effectively and efficiently handle both soil and rock slopes using the one program.
GALENA provides you with the choice of using the Mohr-Coulomb or Hoek-Brown material strength criteria for assessing stability of both soil and rock
slopes.
With both criteria available in GALENA the need for a specialized and separate rock slope analysis package vanishes
Mohr-Coulomb strength criteria is defined in terms of cohesion and angle of shearing resistance (c/phi), together with a material density.
GALENA can also calculate and use increasing cohesion with depth according to Skempton's relationship for cohesive soils.
Hoek-Brown strength criteria can be defined in terms of m, s and UCS, together with a material density.
GALENA also includes tables and Tools functions that enable you to estimate material properties for cohesive and non-cohesive soils, according to
published data and information.
Tables and Tools functions are also included that enable you to determine RMR (Rock Mass Rating) from input parameters according to
Bieniawski. Calculated or entered RMR values can also be used to calculate suggested strengths based on the works of various published authors.
The Mohr-Coulomb or Hoek-Brown criteria can be used with all methods of analysis available within GALENA, not just the Sarma method of analysis.
Material properties can also be defined for slice interfaces when using the Sarma method of analysis in GALENA, thereby allowing you to model
discontinuities and/or joints that may have properties different to those of the surrounding materials. You can of course choose not to define material properties for slice interfaces and simply leave it to GALENA
to automatically calculate slice interface properties based on the surrounding materials.
The image below shows the results of an analysis of a proposed earthen retaining structure where the Factor of Safety was found to be unacceptable
due to the nature of the existing foundation materials.
Note the distortion of the failure surface that has occurred as a result of Restraints applied to an initially-defined circular failure
surface - GALENA can generate and analyze non-circular failure surfaces using a circular failure surface as a "seed."
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