Optimization of Drilling Step Length in Multi-stage Tunneling
The Plaxis 3D Tunnel is a finite-element software that is used for analysis of deformations and stability in geotechnical engineering projects. This software could be utilized to themodel the multi-stage filling and excavating with loading conditions and different boundary conditions using triangle elements of 6 and 15 nodes. Triangular elements of 6 and 15 nodes could be utilized for two-dimensional analysis and only 15 nodes element for 3D analysis.
The first version of this software was designed to analyze the soil dams constructed on soft soils in lowlands of The Netherlands and commissioned by the country's water resources management at Delft University of Technology in 1987, and then its capabilities were expanded in 1993, which has been approved and supported by the CUR Institute. The Plaxis 3D Tunnel software includes four segments of Plaxis 3D Inputs, Plaxis 3D Calculations, Plaxis 3D Outputs, and Plaxis 3D Curves. One of the advantages of this software is its user friendly interface and automated meshing.
Application of Mohr-Coulomb's behavioral models, linear elastic model, hyperbolic stiffness model, the Cam-Clay model and softening model.
Two-dimensional and three-dimensional finite element analysis.
Automatic finite element meshing
Modeling the construction process and tunneling by activating and deactivating of the elements in the computational phase.
What you will learn in this modeling
1. Introduction to Plaxis 3D Tunnel Finite Element Software.
2. Creating geometry of the tunnel and the environment, and meshing of the finite element.
3. Use of boundary conditions, initial conditions and external loading.
4. Inputting the properties of the materials.
5. Modeling the multi-stage drilling in the software.
6. Modeling the drilling step and the distance between the work fronts.
7. Obtaining output from the program, such as soil movement in different directions, total displacement, stress distribution status and transverse diagrams of the ground settlement.
8. Performing analysis on the results.
9. Optimization of the length of the drilling step and the distance between the work fronts using the analysis on the modeling result.
10. Selecting the optimal pattern of tunnel boring.
Tips and Requirements
1. This software cannot be executed due to jailbreak in all versions of the Windows operating system (32-bit versions only).
2. Due to the jailbreak of the software, the limitations in the volume of the calculations are elements intended for the environment and the dimensions of the environment.
3. Introduction to tunneling concepts.
4. Introduction to stage tunneling.
5. Introduction to finite-element modeling.
6. Availability of initial data with the precise accuracy for modeling and ensuring the accuracy of its results.
Objectives of the site in presenting this project
This project has been designed to optimize the drilling step length in multi-stage tunneling. This project could be helpful for university students, researchers and etc. Also it could be proved useful in scientific and industrial projects, and MSc and PhD theses. In some cases, university students require investigation and research for their MSc and PhD theses. Sincethe present project consists of a complete project and includes all university flowcharts, it could prove useful.