Talren v5 - capabilities presentation methods: Fellenius, Bishop . Fellenius and Bishop calculation...
Transcript of Talren v5 - capabilities presentation methods: Fellenius, Bishop . Fellenius and Bishop calculation...
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2015
Software capabilities Talren v5
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Introduction Main input Main output
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Introduction Talren is a software for slope stability analysis of geotechnical structures which enables the check of various types of works:
• natural slopes,
• cut or fill slopes,
• earth dams and dikes,
Taking into account various types of reinforcements: • prestressed anchors,
• soil nails,
• piles and micropiles,
• struts,
• geotextiles,
• geogrids,
• steel and polymer strips.
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Last Windows version: Talren v5.1.4 December 2015 Pro active sales of TALREN software since1990.
More than 500 licences that 1/2 abroad in approximately 50 countries:
- Korea; UK; Turkey; Lebanon; Algeria; India; Morocco…
Talren: developed together with Clouterre 1991 The part of the French Clouterre recommendations dealing with the design of soil nailed walls is largely based on the concepts and theories used in the development of the TALREN software, which is recognized as one of the main design tools for reinforced soils.
2015 Introduction to Talren v5_Capabilities
Some history…
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Input data Geometry Soil characteristics Loads Reinforcements Hydraulic conditions Seismic accelerations
Partial safety factors Calculation options
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Geometry can be complex. Model orientation: uphill on the left (failure from the left to the
right).
Project geometry
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Compulsory data: γ, ϕ, c, ∆c.
Soil properties
If nails are defined in this layer: qs nails: unitary skin friction (traction) pl: limit pressure (shear) KsB (shear)
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Options • Cohesion anisotropy
Non-linear curve.
Soil properties
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Distributed loads (vertical) Linear loads (all angles possible) Additional moments
Loads
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Reinforcements
4 types
Nails Traction+Shear Interaction soil / nail
Anchors Traction Interaction soil / anchor
Strips Traction Interaction soil / strip
Struts Compression No interaction
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Phreatic line
Pressures along polygonal failure surface
Mesh of pore pressures
ru coefficients
Hydraulic conditions
4 options
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External water level: beware ! You should define first your water level for the whole width of the model, and then define also an external water level.
Phreatic line: Water level Base of water table External water level
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Hydraulic conditions
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Hydraulic conditions should be set on option « along non-circular failure surfaces »
u values should be defined with the failure surface definition
Mesh of pore pressures: Defined manually Imported from Plaxis
Pressures along polygonal failure surface
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Hydraulic conditions
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Defined for each layer. Values can be different for each layer Values = 0 by default (no ru coefficient taken into account in any layer). During calculations • In layers where ru ≠ 0: u = ru.g.h • In layers where ru = 0: other existing hydraulic conditions are taken into account. For
example, if a water table is defined, it will be taken into account to calculate u in layers with ru = 0.
• Beware: ru cannot be combined with external water levels.
Coefficients ru
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Hydraulic conditions
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Horizontal and vertical accelerations.
Seismic : pseudo-static method
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4 signs combinations should be tested.
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Partial safety factors
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Partial safety factors
Tables issued from the EUROCODE and Clouterre recommendations for nailed and mixed (nails+anchors) structures
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Slice methods: Fellenius, Bishop.
Global method: Perturbations.
Yield design method (logarithmic spirals):
detailed in a separate presentation.
Calculation options
4 options
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Slice methods: Fellenius, Bishop
Fellenius and Bishop calculation methods
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F calculation based on moments
Additional assumptions necessary to solve the system:
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Fellenius and Bishop calculation methods
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Global method: Perturbations (Raulin, Rouques, Toubol, LCPC 1974) Global method: ≠ slice method
All equilibrium equations are satisfied.
Perturbations calculation method
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The spiral radius depends on the friction angle: the spiral is indeed composed of several spiral « pieces » having the same pole. Discontinuities are possible when changing layer (if friction angles are different).
Yield design method
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• Developped by Jean Salençon, in the 1980s. • Virtual velocity field (one block mechanism). • Mohr-Coulomb criterion. • Logarithmic spiral: leads to the lowest upperbound value.
F = Prm/Pe = Mrm/Me = Mmaximum resistance/Mexternal forces Mrm is maximum for logarithmic spirals (⇒ upperbound solution). F is called « failure coefficient » or « trust factor ». Upperbound value: F < 1.0 ⇒ failure; F ≥ 1.0 ⇒ ??
• No « slide » surface: velocities are not tangent to the block boundary; they are perpendicular to the radius.
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Comparaison with «classical » methods
Comparaison for F = 1
Introduction of XF coefficient
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Yield design method
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Publication “Application du calcul à la rupture aux soutènements”, B. SIMON ENPC – Symposium international ELU/ULS - Paris, Août 2006
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Yield design method
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Critical mechanism for 2nd stage of excavation
Fonctionnalités de recherche étendues
XF = 1.34
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Yield design method
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XF = 1.27
XF = 1.56
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Yield design method Critical mechanism for the last stage of excavation
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XF = 2.16
XF = 1.70
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Yield design method
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Inclined distributed loads can be taken into account.
Active and passive earth pressures can be evaluated.
Gabions can be calculated (concavity can be explored upwards and downwards to find the most unfavourable geometry).
Options available with the Yield Design Method
Virtual vertical wall
Passive thrust
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Yield design method
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Failure surfaces: circular, polygonal or logarithmic spirals
Search mode: • Manual search • Automatic search
1st circle for each centre: Imposed passage point Smallest radius intercepting slope Tangent to a given soil layer
Failure surfaces
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• Automatic search option for circular failure surfaces: Talren scans the area for possible circle centers.
Automatic search
= N
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Automatic search of the critical circle with imposed point for the first calculated circle
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Automatic search
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Default graphical display of results: Factor of safety and the most critical failure suface. Factor of safety for all calculated surfaces
Output
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Complementary options Forces in reinforcements Detailed results per slices
Detailed output
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