3D Excavation by Tunnel Boring Machine

Transcription

1 3D Excavation by Tunnel Boring Machine Angel Francisco Martinez Application Engineer MIDAS NY

2 Content 01 Introduction 02 Advantages of GTS NX for Tunneling 03 TBM Demo

3 Introduction

4 About MIDAS No. 1 in software for civil engineering 650 Developers and Engineers 120 Distribute in 120 countries 10,000 Clients 30,000 Licenses

5 WHY model Tunnels in 3D FEM? 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. 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. Midas GTS-NX is a fully-integrated numerical modelling software for 3D FEM analysis.

6 Advantages of GTS NX for Tunneling

7 Friendly Interface Integrated Solver Optimized for the next generation 64-bit platform Finite Element Solutions for Geotechnical Engineering 7

8 Friendly User Interface Intuitive User Interface makes it easy to Navigate Commands based on AutoCAD Work tree Message window

9 Friendly User Interface CAD Commands for easy 3D modeling Draw a wire type tunnel section on the workplane. Extrude to make 3D solid from 2D wire.

10 Friendly User Interface Simplified Modeling AutoCAD geometries Import Verification of connection before and after meshing

11 Friendly User Interface Advanced Meshing Mesh size control Integrations of embedded structural elements and connected with mesh

12 Complete Integrated Solver Optimized for the next generation 64-bit platform Finite Element Solutions for Geotechnical Engineering 16

13 Complete Any type of tunnel

14 Complete Constant Water Pressure Easily apply water level/tables for initial conditions. Automatically consider the water pressure as load on excavations/tunnels.

15 Complete Semi / Fully Stress-Seepage Coupled Analysis Change in Pore Pressure - Pore Pressure - Flow Path - Nodal Head - Flow Quantity Flow Paths Flow Quantity

16 Complete Structural data base Extraction of 2D and 1D elements to model reinforcement as a shotcrete and rock bolts Tunnel walls Rock Bolts Shotcrete Anchors

17 Complete Boundary Conditions for CS 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).

18 Complete Constitutive Models Data Base

19 Complete Generalized Hoek Brown Linear-Elastic Plastic Behavior for Rock

20 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

21 Complete Parametric Analysis Compare results in same model by varying specific material types or parameters. Soil (Mohr Coulomb) Rock (Hoek Brown)

22 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.

23 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.

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

25 Complete Soil Structure Interaction by Direct Method Import full structures from midas software for realistic interaction between soil and adjacent structures.

26 Wizards Integrated Solver Optimized for the next generation 64-bit platform Finite Element Solutions for Geotechnical Engineering 28

27 Wizard Tunnel Wizard

28 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. 2D Anchors 3D Anchors

29 Wizard Wizard for easy construction stages set up

30 Wizard Use CS wizard to efficiently define the construction stages. Remove and Activate sets in sequence. 1 2

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

32 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

33 TBM Demo

34 3D TBM Tunnel Boring Machine

35 Excavate > Install > Reinforce > Excavate Initial stage (Intact Rock) Initial Rock Excavation Stages (Shield advances) Tunnel Segment installation stages Grout Injection Stages

36 Repeat steps until tunnel reinforcement finishes Ring Segments Grout Shield Rock Grout Ring Segments Shield Grout Ring Segments Ring Segments Grout

37 Materials and Properties Ground Materials Structure Materials Properties

38

39 Open Start file 1. Menu > Open 2. Select TBM_Start 3. Materials and properties already defined in start file 1 3 2

40 Geometry Modeling

41 Geometry Modeling

42 Geometry Modeling

43 Geometry Modeling

44 Mesh Generation

45 Mesh Generation

46 Rename Meshes

47 Loads

48 Drilling Pressure Loads

49 Jack Thrust Loads

50 Shield Pressure Loads

51 Segment Pressure Loads

52 Boundary Conditions

53 Boundary Conditions

54 Construction Stages Summary Shield Ring Segments Grout

55 Construction Stages Summary

56 Construction Stages

57 Construction Stages

58 Construction Stages 1

59 Analysis Case

60 Results

61 Results

62 Results

63 Results

64 Results

65 Results 3D-2D Wizard When checking the results after 3D analysis, use the cut section & clipping function to check the arbitrary section result contours. Multi-Stage Animation

66 Coming Soon Diamond Engineer Series Coming soon in March!

67 Thanks! Integrated Solver Optimized for the next generation 64-bit platform Finite Element Solutions for Geotechnical Engineering