LimitState:GEO

Presented here are a series of real-world and illustrative example problems analysed using LimitState:GEO. To run or find out more about a file, download it and open with LimitState:GEO.

With LimitState:GEO it is easy to visualize failure modes. These can be viewed as animations within the software, or exported as simple animated GIF files for others to view. To see more examples of LimitState:GEO in use, take a look at some of the video tutorials or visit the verification pages.

Double Stem Wall

Two stem walls contain a soil mass with surcharge loading. Stability analysis is required to determine a) whether the critical failure mechanism involves one or both walls and b) the maximum surcharge that can be applied.

Multiple soil layers.
Derived material properties applied to boundaries around structure / soil interfaces.

Gravity Wall

A gravity retaining wall is holding back a slope with a surcharge load on it. Stability analysis is required to determine the partial factor of safety on material strength.

Multiple soil layers.
Structure / soil interfaces using derived mohr-coulomb materials.

Layered Slope - Existing Slip

A layered slope containing a pre-existing line of slip is analysed to determine the factor of safety on material properties.

Multiple soil layers (including a lens of very soft clay).
A pre-existing line of slip; created using a weak material assigned to a boundary.

Weathered Rock Slope

A rock face comprising of increasingly weathered boulders (typical behaviour seen in tropical regions) is analysed to determine its ability to withstand a change in material properties.

Rock units modelled using concrete material.
Stable rock mass modelled using fixed right-hand boundary.
Permanent surcharge loading applied to top surface.

Extended Slope

A man-made slope has been extended and a localised variable load applied a short distance back from the crown. A weak layer of topsoil exists between the old and new fill materials and a water table rises partly into the toe of the slope. A stability analysis is required to determine whether either of these features poses a problem.

The model contains:

A water table.
Multiple soil layers.
A thin layer of soil (modelled using a boundary).

Masonry Retaining Wall

A single-track road is to be constructed close behind an masonry retaining wall. The structure requires analysing for stability to determine the maximum additional load that can be exerted. The analysis examines short term (undrained) stability.

A geometry generated using an imported DXF file.
Mortar in the masonry wall modelled by applying both an interface material and a tension cutoff material.
Areas of increased nodal density to improve solution accuracy.

Nailed Slope with a Strong Nail

A steep slope with reinforcing nails is analysed. The nails have a high resistance to lateral movement and pullout.

A user defined soil nail material with high values of pullout and lateral resistance.
Multiple soil layers.

Nailed Slope with a Weak Nail

A steep slope with reinforcing nails is analysed. The nails have a low resistance to lateral movement and pullout.

A user defined soil nail material with low values of pullout and lateral resistance.
Multiple soil layers.

Propped Excavation

A layered clay is being excavated. A vertical shaft has been constricted and propped and horizontal excavation has begun below it. Stability analysis is required to determine the adequacy factor on material self weight.

Multiple soil layers.
A rigid 'H' structure to model the prop.

Quay Wall

A quay wall with a crane rail running close to it requires analysis for stability.

Water table.
'Derived' materials on interfaces.
Rigid materials used for concrete to improve solution accuracy.
Areas of increased nodal density to improve solution accuracy.

A retaining wall comprising concrete blocks attached to reinforcing elements is analysed.

Concrete blocks modelled with frictionless interfaces.
Reinforcement with user-specified pullout and lateral resistances.
Rigid materials used for concrete to improve solution accuracy.

A retaining wall comprising concrete blocks attached to reinforcing elements is analysed.

Concrete blocks modelled with frictionless interfaces.
Reinforcement with user-specified pullout and lateral resistances.
Rigid materials used for concrete to improve solution accuracy.

A pre-existing wall must remain stable following the partial erection of a building nearby. Analysis of the state of stability of the wall is required prior to designing any necessary reinforcement (i.e. soil nails / anchors).

Multiple material properties applied to boundaries.

Wind Turbine

A wind turbine is located in the side of a steep slope of glacial till. A weakened layer of softened till material lies beneath the turbine. Stability analysis is required to determine the critical loading case due to the high magnitude, eccentric forces imparted by the turbine. Of particular concern is the possibility for local concentration of bearing pressure beneath the toe, which could lead to the development of a constrained yielding within the softened layer.

A geometry generated using an imported DXF file.
Loading (provided as moment, axial loading and shear) applied using a weightless, rigid structure.
A water table.

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LimitState:GEO - Examples