Angel Francisco MartinezApplication Engineer

MIDAS NY

3D Excavation by

Tunnel Boring Machine

01 Introduction

02 Advantages of GTS NX for Tunneling

03 TBM Demo

Content

Introduction

No. 1 in software for civil engineering

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About MIDAS

Numerical modeling permits the analysis of complex tunnel excavation in sequences by

representing material constitutive behaviors, accurate structural geometries, realistic boundary conditions/loads, soil-structure interaction and critical processes such as consolidation and seepage. Ground displacements associated with tunnel

excavations occur in vector directions X-Y-Z, thus to accurately represent ground behavior during tunnel excavation processes, detailed 3D numerical analysis is vital.

Midas GTS-NX is a fully-integrated numerical modelling software for 3D FEM analysis.

WHY model Tunnels in 3D FEM?

Modeling tunnels in 3D is becoming more attractive because of

limitations of the 2D modeling and because it captures the response of tunnel excavations more accurately.

Advantages of GTS NX for Tunneling

Integrated Solver Optimized for the next generation 64-bit platform

Finite Element Solutions for Geotechnical Engineering

Friendly Interface

7

Intuitive User Interface makes it easy to Navigate

Commands based on AutoCADWork treeMessage window

Friendly User Interface

Friendly User Interface

• Draw a wire type tunnel section on the workplane.• Extrude to make 3D solid from 2D wire.

CAD Commands for easy 3D modeling

Simplified ModelingAutoCAD geometries ImportVerification of connection before and after meshing

Friendly User Interface

Advanced Meshing• Mesh size control• Integrations of embedded structural elements and

connected with mesh

Friendly User Interface

Integrated Solver Optimized for the next generation 64-bit platform

Finite Element Solutions for Geotechnical Engineering

16

Complete

Any type of tunnel

Complete

Complete

Constant Water Pressure• Easily apply water level/tables for initial conditions.

• Automatically consider the water pressure as load on excavations/tunnels.

Semi / Fully Stress-Seepage Coupled Analysis

Change in Pore Pressure - Pore Pressure

- Flow Path

- Nodal Head

- Flow Quantity

Complete

Flow Paths Flow Quantity

Structural data base

•Extraction of 2D and 1D elements to model reinforcement as a shotcrete and rock bolts

Rock Bolts ShotcreteTunnel walls Anchors

Complete

Boundary Conditions for CS

Complete

• Apply a new attribute data or substitute an existing attribute data for an element that changes with the construction stage.

• It can be used in construction stage-using analysis (Static/Slope analysis, Seepage/Consolidation analysis).

Constitutive Models Data Base

Complete

Generalized Hoek BrownLinear-Elastic Plastic Behavior for Rock

Complete

Jointed Rock Mass

• Transversely Isotropic Perfectly Plastic Material Model• Rock layers have isotropic properties in the layer direction, but have anisotropic properties in the

normal direction to the layer.• The perfectly plastic behavior is based on the Coulomb friction function in the major joint direction

Complete

Parametric Analysis

•Compare results in same model by varying specific material types or parameters.

Soil (Mohr Coulomb) Rock (Hoek Brown)

Complete

Interface Faults

GTS NX also allows you to model rock faults

using an interface.

A plane of the surface is used to model the

discontinuity.

Complete

Contraction• Consider shrinkage or simulate a

volume loss around a lining of TBM tunnel.

• It can be applied by selecting beam/shell elements in 2D/3D model.

Complete

Material Status• Plastic Status of Ground Element• Safety Result (Mohr-Coulomb) Calculate Factor of Safety for each element based on MC

failure criteria. In case that Safety Factor is less than 1.2, it can be identical with plastic

failure region.

Complete

Use the prestress function to apply the resultant force or stress as initial conditions

Initial Equilibrium Force

•Sxx, Syy, Szz : Axial stress in each axial direction

•Sxy, Syz, Szx : Shear stress in each plane direction

Complete

Flight Simulator

Complete

The Perspective view function from the View toolset below can be used to check the interior information and results of a 3D model.

Complete

Soil Structure Interaction by Direct Method

Import full structures from midas software for realistic interaction between soil and adjacent structures.

Integrated Solver Optimized for the next generation 64-bit platform

Finite Element Solutions for Geotechnical Engineering

28

Wizards

Tunnel Wizard

Wizard

Wizard

Anchor Wizard

Creates a simple anchor for 2D and 3D models.

• The anchor length can be classified as an un-grouted length or a grouted length.

• Prestress is the initial prestressing force of the anchor. A (+) value represents tension and A (-) value represents compression.

3D Anchors2D Anchors

Wizard for easy construction stages set up

Wizard

Wizard

• Use CS wizard to efficiently define the construction stages. • Remove and Activate sets in sequence.

1

2

Stage Simulator

Wizard

Check the defined construction stage as a video. It can be used in analyses that incorporate construction stages (Static/Slope analysis, Seepage/Consolidation analysis).

Tunnel Volume Export to Excel

• The volume data of 3D elements defined to the construction stage is exported to excel file.

• This shows the length/area/volume of activated/deactivated set for stages

TBM Demo

3D TBM

Tunnel Boring Machine

Excavate > Install > Reinforce > Excavate

Initial stage (Intact Rock)Initial Rock Excavation Stages (Shield advances)

Tunnel Segment installation stages Grout Injection Stages

Repeat steps until tunnel reinforcement finishes

Grout Ring Segments Shield Rock Grout Ring Segments Shield

Grout Ring Segments Grout Ring Segments

Materials and Properties

GroundMaterials

StructureMaterials

Properties

Open Start file

1. Menu > Open

2. Select TBM_Start

3. Materials and properties already defined in start file

1 3

2

Geometry Modeling

Geometry Modeling

Geometry Modeling

Geometry Modeling

Mesh Generation

Mesh Generation

Rename Meshes

Loads

Drilling Pressure Loads

Jack Thrust Loads

Shield Pressure Loads

Segment Pressure Loads

Boundary Conditions

Boundary Conditions

Construction Stages Summary

Grout

Ring Segments

Shield

Construction Stages Summary

0

2 3

4

1

Construction Stages

Construction Stages

Construction Stages

1

Analysis Case

Results

Results

Results

Results

Results

Results

3D-2D WizardWhen checking the results after 3D analysis, use the cut section & clipping function to check the arbitrary section result contours.

Multi-Stage Animation

Coming Soon

Diamond Engineer

Series

Coming soon in March!

Integrated Solver Optimized for the next generation 64-bit platform

Finite Element Solutions for Geotechnical Engineering

Thanks!http://globalsupport.midasuser.com/helpdesk/