• Author / Uploaded
• Shanna Aurora Pimentel

• Categories
• Método de elementos finitos
• Física y matemáticas
• Física
• Mecánica de Medios Continuos
• Ingeniero civil

Citation preview

Slope Stability Analysis Pseudo Static Angel Francisco Martinez MidaSoft Civil Engineer

Integrated Solver Optimized for the next generation 64-bit platform

Finite Element Solutions for Geotechnical Engineering

Overview

GTS NX

STEP 01

Geometry Import

STEP 02

Import Materials

STEP 03

Mesh generation

STEP 04

Boundary Conditions

STEP 05

Seismic Coefficient

STEP 06

Analysis Case

STEP 07

Perform analysis and check result

2

01 2D Slope

GTS NX

Procedure • 2D nonlinear time history analysis coupled with slope stability •Plane strain elements are used to model ground condition.

•Free Field boundary conditions used for time history analysis. •Ground Acceleration used as dynamic load.

For performing slope stability analysis using the finite element method (FEM), use higher order elements and triangle shaped elements while applying seismic static coefficient and time history function.

3

02 Material for Soil

GTS NX

Name

Ground

Material

Isotropic

Model Type

Mohr-Coulomb General

Elastic Modulus (E) (kN/m^2) Poisson’s Ratio(v)

50,000

0.4

Unit Weight(r) (kN/m^3)

19

K0

1 Porous

Unit Weight(Saturated) (kN/m^3)

19 Non-Linear

Friction Angle Cohesion (kN/m^2)

5 30

1-4

03 Property for Soil

GTS NX

Name

Ground

Property

2D

Model Type

Plain Strain

Material

Ground

1-5

01 Create New Project

GTS NX

Procedure 1

Main Menu > New

2

Analysis Setting > Model

1

Type > 2D Set units to kN / m / sec 2

6

02 Geometry works (Create or Import from AutoCAD)

GTS NX

Procedure 1

Main Menu > Import > DXF

2

Select Slope Stability cad.x_t 1

3

1

Select OK

2

3

7

03 Define Material / Property for Soil & Structures

GTS NX

Procedure • Define Material 1

Mesh > Prop > Material

2

Create > Isotropic

3

Select Mohr- coulomb from Model

1

2

Type Type in values and name as shown

3

8

04 Define Material / Property for Soil & Structures

GTS NX

Procedure 1

Mesh > Prop. > Property 1

2

Create > 2D

3

Select Plane Strain

4

Select Material

2

OK

3

4

9

05 Generate Mesh (2D Element)

GTS NX

Procedure 1

Mesh > Generate > 2D > Auto -

1

Area

2

Select Edge(s) > Select 6 edges highlighted in figure. 2

1

Input element Size : 1 3

4

7 2

(1m between two nodes)

8

Select Property : Ground 3

5

Input Mesh Set Name : Ground

6

Click on the ‘>>’ icon to open the Advanced Option Window

7

Select Triangle as Element Type

8

Activate Higher Order Elements

9

Click OK > OK



4

5

9

6

10

06 Define Boundary Condition (Ground)

GTS NX

Procedure 1

Static / Slope Analysis >

1

Boundary > Constraint > Advanced

2

Select auto

3

Press OK

11

07 Load Condition (Self Weight)

GTS NX

Procedure 1 1

Static / Slope Analysis > Load > Self Weight

2

Load Set Name : Self weight

2

12

08 Load Condition (Seismic Coef.)

GTS NX

Procedure 1 1

Static / Slope Analysis

2

Load Set Name Seismic Coefficient Type in the seismic coefficients for vertical 0.2 and horizontal

0.3

2

13

09 Analysis Case

GTS NX

Procedure

Create Analysis Cases 1. Analysis > Analysis Case > General > SRM 2. Activate All Sets 3. Press OK > OK

14

10

Perform Analysis

GTS NX

Procedure

1. Analysis > 2. Analysis > Perform Select OK

15

11 Post Processing (Post mode)

GTS NX

Procedure

1

Inspect the FOS or the SRM analysis case. FOS: 0.8637 SRM>Plane Strain Strains>EEquivalent

1

2

16