Click to edit Master title styleGround Engineering in LUSAS

LUSAS Marketing department

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Why use LUSAS for Geotechnics?

“LUSAS is a general finite element modelling system.

Its soils-specific tools allow explicit modelling

of both ground and structure in 2D or 3D in one place”

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Application AreasEngineering Issues:• Bearing Capacity• Overturning• Stability• Consolidation• Seepage• Vibration

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Modelling Tools Overview

CAD Import / Export• Points and lines through DXF• Points, lines, surfaces and volumes through IGES/STEP• Triangulated surfaces from

ground models through STL

CAD-Style Drawing Tools• Snap Grids• Arcs and Splines• Copy, Mirror, Rotate, Scale, Transform• Extrude, Intersect and Manifold• Subtract, Union

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Example Modelling in 2D

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Example Modelling in 3D

Surface sweeping for multiple volume creation,

planar or curved

Subtraction command for creation of voids Master Object

Tool Object

Intersection command for slicing of volumes, planar

or curved.

Intersection and subtraction commands for cylindrical surface with internal void through volume

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Soil and Structure Material Models

Constitutive Soils models• Tresca• Von Mises• Druker Prager• Mohr Coulomb• Modified Cam Clay

Structural Models• Concrete Cracking and Crushing

All models can incorporate strain hardening and softening

Mohr-Coulomb Soil retained by RC wall

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Meshing Tools

General Facilities:• Linear and Quadratic formulations• Refinement

2D Meshing:• Quads and Triangles

3D Meshing:• Tetrahedral • Penta/Hexahedral

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Interface Modelling

Linear Springs• Modulus of sub-grade reaction

Non-Linear Springs• Active/Passive Soil Joints

Interface meshes • Joining soil / structure

Contact• Gain / Loss of contact• Skin Friction

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Construction Sequence

Activation and Deactivation for:• Excavation sequences• Insertion / Deletion of Temporary Members

• Propping and Jacking

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Consolidation and Seepage

Consolidation• Pore-Water pressure equalisation with time• 2D and 3DSeepage• Dams• Dewatering

Dewatering operation in soil mass

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Soil-Structure Vibration

Facilities:• Modal and Time History Dynamics• Material Damping• Non-Linear behaviour • Soil plasticity• Boundary behaviour• Spring/Damping

Vertical Displacement Response in BuildingPile

DrivingImpact

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Application Examples

Animation Examples including:• Excavation• Slope Stability• Tunnelling• Dams• Backfilled Bridges• Dewatering• Consolidation• Vibration

Excavations

Pile Group Analysis

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Stability of Embankments

Tunnelling in Rock and Soil

Soil, Rock and Structure Modelling

Soil Arch Construction Sequence

Seismicity in Soils

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Secant Pile Boring Sequence

Sequential boring and pouring of piles

Investigation of curing/hardening of concrete

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Rail-Induced Soil Vibrations

Excitation of tunnel due to rail load

transit

Secondary response of building to emitted vibrations