CESAR-LCPC
Soils & Rocks| Main points to consider |
The following points must be considered for adequate geotechnical modelling:
While a complete and user-friendly toolbox for model generation and analysis is a prerequisite to successful modelling, the availability of efficient and fast post-processing tools is equally important. CESAR-LCPC offers solutions to both of these essential issues. |
| A pre processor allowing the generation of outstanding problems |
Complex 2D and 3D geometries can be defined using professional CAD tools integrated in the dedicated pre-processor CLEO. |
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| A pre processor allowing the generation of outstanding problems |
| The history dependency of the soil behaviour implies that the sequencing of phased construction plays a crucial role in the resulting soil response. Phasing can be modelled in a simple and intuitive way with CESAR-LCPC. The geometry and the mesh of the model are common to all phases. Beyond this common basis, the user can specify for each phase the following parameters:
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Phased construction of an embankment on a slope
| K0 initial state procedure |
| For horizontal soil layering, a K 0 ratio can be specified per layer to prescribe the horizontal stress distribution. The resulting stress field is used as a starting point to the subsequent calculation phase. CESAR-LCPC manages seamlessly the passing of the stress state, the plastic state and optionally of the displacement state from one phase to the consecutive one. |
| Soil-structure interaction |
| For the design of retaining walls, tunnel lining, anchors, bolts and geogrids, CESAR-LCPC allows realistic modeling of the soil-structure interaction thanks to the availability of a wide range of dedicated elements such as contacts, trusses, beams, plates, shells, springs and linear relations. Bond-slip and friction behaviour at the soil-structure interface is modelled in CESAR-LCPC using a robust and elaborate contact algorithm. Three criteria are available:
 Pile group subjected to horizontal load |
| Soil-structure interaction: reinforcement |
| Proper modelling of soil reinforcement is essential to achieve an accurate description of the analysed mechanisms. Reinforcement systems such as bolts, nails, anchors, micropiles or geotextiles can be modelled using structural elements such as trusses, beams or shells. A second approach : the heterogeneous reinforced soil is replaced by an equivalent homogenous material. This approach is based on the theory of homogenisation of periodic media. This approach has the advantage of allowing the generation of meshes that are independ from the geometry of the inclusions. In CESAR-LCPC, the multi-phase model of Sudret and de Buhan (1999) is implemented. |
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| Modelling a pore pressure and groundwater flow |
Groundwater can play a key role in geotechnical projects. With CESAR-LCPC, two approaches based on the Terzaghi assumption are available to model the effect of groundwater:
CESAR-LCPC has advanced groundwater flow modules that can handle non-saturated transient flow. The pore pressure results of such an analysis can be used as loading in a mechanical analysis. Consolidation analysis can also be carried out using the fully coupled poro-mechanical model available in a dedicated module of CESAR-LCPC. |
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| Bibliographical references |
 BOURGEOIS E., SEMBLAT J.-F., GARNIER D., SUDRET B.Multiphase model for the 2D and 3D numerical analysis of pile foundations. Tenth International Conference on computer methods and advances in geomechanics. Tucson, Arizona (USA), 7-12 january 2001, p. 1435-1440.
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