PLAXIS

PLAXIS
Name	PLAXIS
Developer	Bentley Systems
Released	0 1987
Genre	Finite element analysis software
License	Proprietary

PLAXIS. It is a specialized suite of finite element method software used primarily for the analysis of deformation, stability, and groundwater flow in geotechnical engineering projects. Developed to handle the complex, non-linear behavior of soil and rock mechanics, it has become an industry-standard tool for engineers and researchers worldwide. The software enables sophisticated modeling of soil-structure interaction, making it critical for the design and safety assessment of major infrastructure.

Overview

PLAXIS provides a comprehensive environment for simulating the behavior of geotechnical structures under various loading conditions. Its core methodology is based on advanced constitutive models that accurately represent materials like clay, sand, and rock. The software is extensively used for projects involving foundation engineering, tunneling, excavation support, and slope stability analysis. By integrating with other engineering disciplines, it supports the workflow for projects such as those managed under the International Building Code or assessed for Eurocode 7 compliance.

History and Development

The origins of the software trace back to academic research at the Delft University of Technology in the Netherlands during the late 1970s. The first commercial version was launched in 1987 by Plaxis BV, a company founded to market the technology. A significant evolution occurred with the release of PLAXIS 2D, which introduced a more user-friendly graphical user interface. The company was later acquired by Bentley Systems, integrating it into a broader portfolio of infrastructure engineering software. Key figures in its development include researchers like Peter Vermeer, whose work on the Mohr-Coulomb criterion influenced early material models.

Core Features and Capabilities

The software's engine performs two-dimensional and three-dimensional finite element analysis, utilizing automatic mesh generation for complex geometries. It incorporates a library of advanced material models, including the Hardening Soil model and the Soft Soil Creep model, to simulate time-dependent behavior. Critical analysis types include coupled consolidation for modeling pore pressure dissipation and dynamic analysis for seismic loading. Features like phased construction simulation allow engineers to model the sequential steps of a project, such as those seen in the Channel Tunnel or the Three Gorges Dam.

Applications in Geotechnical Engineering

Engineers apply the software to a vast array of challenging projects to ensure stability and predict deformations. In tunneling and underground construction, it is used to design tunnel boring machine operations and assess impacts on existing structures, akin to methods used for the Gotthard Base Tunnel. For embankment and dam design, it analyzes seepage and long-term settlement. The software is also vital for offshore geotechnics, modeling pile foundation behavior for structures like wind turbines in the North Sea, and for landfill design, where it assesses liner system integrity.

Software Versions and Modules

The primary product lines are PLAXIS 2D and PLAXIS 3D, each tailored for specific dimensional analysis. Specialized modules extend functionality, such as PLAXIS Monopile Designer for offshore wind farm foundations and PLAXIS Dynamics for earthquake engineering. The PLAXIS Designer application provides an integrated modeling environment for creating complex geotechnical geometries. Recent versions have seen integration with the Bentley Systems platform, including connections to OpenGround for geotechnical investigation data. The software's development aligns with advancements in cloud computing and Building Information Modeling workflows.

Integration with Other Tools

The software functions within a broader digital ecosystem for infrastructure project delivery. It can import geometry directly from CAD software like AutoCAD and MicroStation. For soil data management, it interfaces with databases like gINT and the aforementioned OpenGround. Results are often exported to Microsoft Excel for further processing or to Python for custom scripting and automation. Within the Bentley Systems portfolio, it connects to solutions like STAAD.Pro for structural analysis and OpenRoads for civil design, enabling multidisciplinary projects such as those following the ISO 19650 standard for information management.

Category:Geotechnical engineering Category:Finite element software Category:Bentley Systems