SLIDE (rocscience group) GALENA GEO-SLOPE GEO5 GGU SOILVISION
Software based on Numerical modeling
PHASES2 PLAXIS FLAC-SLOPE / UDEC / PPF ANSYS FEFLOW GEOSLOPE/SIGMA SOIL-VISION
Continuum modeling is best suited for the analysis of slopes that are comprised of massive, intact rock, weak rocks, and soil-like or heavily jointed rock masses. Discontinuum modeling is appropriate for slopes controlled by discontinuity behaviour.
Numerical modeling
• Continuum modelling
FEM, BEM and FDM
• Discontinuum modelling
DEM, UDEC
• Hybrid modelling
PPF,
What are the conditions of slope in the field
Advantages: Allows for block deformation and movement of blocks relative to each other, can modeled with combined material and discontinuity behaviour coupled with hydro - mechanical and dynamic analysis
joints • Joint behaviour • Water pressure
• Continuum modelling (water simulation)
Pore water pressure Ground water table Infiltration of rain water
Discontinuum modelling
Critical Parameters: shear strength of material, constitutive criteria, water condition, insitu stress state
Advantages: Allows for material deformation and failure, model complex behaviour, pore pressures, creep deformation and/or dynamic
▪ Properties of each Joints strength
▪ Properties of each joint set or combined properties
▪ Properties of jointed rock mass
▪ Properties of waste rock
Continuum modelling
Required input properties
Young modulus Poisson ratio Density Failure criterion: M-C Cohesion Friction angle
H-B UCS m&s
Numerical modeling
Type of failure mechanism Physico-mechanical behaviour of slope material Types of analygle, two or three joints ▪ Large number of joint sets present in the slope ▪ Heavily jointed rock slope ▪ Waste dump / very weak rock / soil
▪ Simple slope with single, two or three joints
▪ large number of joint sets present in the slope
▪ Heavily jointed rock
▪ Waste dump / very weak rock / soil
loading can be simulated
Limitations: inability to model effects of highly jointed rock
Continuum modelling
• Typical Input required
Moduls of Elasticity Poision ratio Density Shear strength
(cohesion and friction angle) Model Behavior
Continuum modelling
Typical Input required • Moduls of Elasticity for rock
and joints • Poision ratio for rock and joints • Density • Shear strength for rock and
Discontinuum modeling is appropriate for slopes controlled by discontinuity behaviour
Critical Parameters: discontinuity stiffness and shear strength; groundwater characteristics; in situ stress state.
STABILITY ANALYSIS OF SLOPE
Limit equilibrium Method (LEM) Advantage of LEM Limitation of LEM
Numerical modeling Advantage Limitation
Software based on Limit equilibrium Method