1. Tunnel water conveyance
The names of God
subject of presentation :
Modeling of twain
Tunnel water conveyance
Presented By : Hamed Zarei
PLAXIS version 8
Tutorial manual
Dynamics manual

2. To create the geometry model and steps of Tunnel modeling in PLAXIS , follow these steps:
Geometry of a tunnel
Material properties
Boundary conditions
Mesh generation
Initial conditions
Calculations
Viewing output results

3. CREATING A GEOMETRY MODEL
The creation of a geometry model is based on the input of points and lines. This is done by means of a mouse pointer in the draw area.

4. creation of a horseshoe-shaped tunnel
Created the tunnel
creation of a horseshoe-shaped tunnel
The tunnel considered has a diameter of 5.3 m
Space between tunnels is 12m
Tunnel designer with current tunnel model

6. Static Analysis Static Modeling
Boundary Conditions
Click on the Standard fixities button to apply the appropriate boundary
conditions. In addition to the standard displacement fixities

7. Material properties
Static Modeling
After the input of boundary conditions, the material properties of the Rock clusters and other geometry objects are entered in data sets.
The creation of material data sets is generally done after the input of boundary conditions. Before the mesh is generated, all material data sets should have been defined and all clusters and structures must have an appropriate data set assigned to them.

8. Static Modeling Material properties 𝜇 E 𝜑 C γ )Degree( 0/23 5 x 10 5
( 𝐾𝑁 𝑚 2 ) 𝜑
)Degree( C γ
( 𝐾𝑁 𝑚 3 )
0/23
5 x 10 5 43
700 30
Material properties of Rock in the tunnel project

9. Static Modeling The properties for those Shotcrete are listed in Table
Material properties
Static Modeling
The properties for those Shotcrete are listed in Table 𝜇 𝑊
( 𝐾𝑁 𝑚 𝑚 )
𝐸 𝐼
( 𝐾𝑁 𝑚 2 𝑚 )
𝐸 𝐴
( 𝐾𝑁 𝑚 )
0/2
2/3
1750
1/728 x 10 5
Material properties of the Shotcrete

10. Static Modeling Material properties 𝐸 𝐴 ∅ 1/2x 10 6 25
(𝑚𝑚)
𝐸 𝐴
( 𝐾𝑁 𝑚 ) 25
1/2x 10 6
Material properties of the Rock bolt

11. Static Modeling
Mesh generation
In this example the 15-node element is used as the basic element type.

12. Mesh generation
Static Modeling
The global coarseness parameter can remain at its default value (Fine). It can be expected that stress concentrations occur around the tunnel. Therefore the mesh should be refined in these areas.

13. Static Modeling Select a Plastic calculation using Staged construction
CALCULATIONS
Static Modeling
Select a Plastic calculation using Staged construction
The first calculation phase is used to excavate the right tunnel and activate Shotcrete
The second calculation phase is used to excavate the left tunnel and activate Shotcrete
The second calculation phase is a plastic calculation, Staged construction.

14. Static Modeling
Select some characteristic points for load-displacement curves
Start the calculations

15. Dynamic Analysis Dynamic Modeling
Standard earthquake boundaries are used at the bottom and at
the right hand boundary to avoid spurious reflections

16. The earthquake is modelled by imposing a prescribed displacement at the bottom boundary.
Dynamic Modeling
Therefore the input value of the horizontal prescribed
displacements is set to 0.01 m. The vertical component of the prescribed displacement is kept zero
(ux=0.01m and uy=0.00m).

17. Dynamic Modeling
Change the Rayleigh damping parameters α and β to and 0.01 respectively

18. Dynamic Modeling
Select Dynamic analysis for the calculation type in the General tab sheet.
Set the Time interval to 0.5 sec in the loading input box

19. In this phase, a vertical harmonic load, with a frequency of 10 Hz and amplitude of 50 kN/m2
Dynamic Modeling

20. This presentation
Uploaded in