滑坡稳定性分析.pptx

Limit equilibrium Method (LEM)
Advantage of LEM
Limitation of LEM
Numerical modeling
Advantage
Limitation
STABILITY ANALYSIS OF SLOPE
Software based on Limit equilibrium Method
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
Required input properties
Young modulus
Poisson ratio
Density
Failure criterion:
M-C H-B
Cohesion UCS
Friction angle m & s
Numerical modeling
Type of failure mechanism
Physico-mechanical behaviour of slope material
Types of analysis
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 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
Properties of each Joints strength
Properties of each joint set bined properties
Properties of jointed rock mass
Properties of waste rock
Continuum modelling
Continuum modeling is best suited for the analysis of slopes that prised of massive, intact rock, weak rocks, and soil-like or heavily jointed rock masses. Discontinuum modeling is appropriate for slopes controlled by discontinuity behaviour.
Critical Parameters: shear strength of material, constitutive criteria, water condition, insitu stress state
Advantages: Allows for material deformation and failure, plex behaviour, pore pressures, creep deformation and/or dynamic 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