滑坡稳定性分析
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▪ Simple slope with single, two or three joints ▪ Large number of joint sets present in the slope ▪ Heavily jointed rock slope ▪ 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
joints • Joint behaviour • Water pressure
• Continuum modelling (water simulation)
Pore water pressure Ground water table Infiltration of rain water
Discontinuum modelling
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
STABILITY ANALYSIS OF SLOPE
Limit equilibrium Method (LEM) Advantage of LEM Limitation of LEM
Numerical modeling Advantage Limitation
Software based on Limit equilibrium Method
Discontinuum modeling is appropriate for slopes controlled by discontinuity behaviour
Critical Parameters: discontinuity stiffness and shear strength; groundwater characteristics; in situ stress state.
Numerical modeling
• Continuum modelling
FEM, BEM and FDM
• Discontinuum modelling
DEM, UDEC
• Hybrid modelling
PPF,
What are the conditions of slope in the field
▪ 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
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.
(cohesion and friction angle) Model Behavior
Continuum Βιβλιοθήκη Baiduodelling
Typical Input required • Moduls of Elasticity for rock
and joints • Poision ratio for rock and joints • Density • Shear strength for rock and
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 analysis
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
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
▪ Properties of each Joints strength
▪ Properties of each joint set or combined properties
▪ Properties of jointed rock mass
▪ Properties of waste rock
Continuum modelling
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
joints • Joint behaviour • Water pressure
• Continuum modelling (water simulation)
Pore water pressure Ground water table Infiltration of rain water
Discontinuum modelling
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
STABILITY ANALYSIS OF SLOPE
Limit equilibrium Method (LEM) Advantage of LEM Limitation of LEM
Numerical modeling Advantage Limitation
Software based on Limit equilibrium Method
Discontinuum modeling is appropriate for slopes controlled by discontinuity behaviour
Critical Parameters: discontinuity stiffness and shear strength; groundwater characteristics; in situ stress state.
Numerical modeling
• Continuum modelling
FEM, BEM and FDM
• Discontinuum modelling
DEM, UDEC
• Hybrid modelling
PPF,
What are the conditions of slope in the field
▪ 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
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.
(cohesion and friction angle) Model Behavior
Continuum Βιβλιοθήκη Baiduodelling
Typical Input required • Moduls of Elasticity for rock
and joints • Poision ratio for rock and joints • Density • Shear strength for rock and
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 analysis
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
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
▪ Properties of each Joints strength
▪ Properties of each joint set or combined properties
▪ Properties of jointed rock mass
▪ Properties of waste rock
Continuum modelling