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3DEC


UDEC/3DEC Short Course
Itasca Software Training Course Tongji University Shanghai, China October 27-31, 2008 Peter Cundall, Yanhui Han & Roger Hart Itasca Consulting Group, Inc.

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Training Schedule
October 29, 2008 (morning)
09:00-10:15 3DEC Graphical Interface - The new graphical interface for creating and manipulating 3DEC output 10:15-10:30 10:30-12:00 Break UDEC/3DEC Application - Model generation including joint structure creation - Simple exercises

3DEC 4.10 Graphics Capabilities

3DEC Main Window

terminal interface

plot views

plot item and view controls

Overview
View Area Legend Control Panel:
– Plot-item List – View Info. – Element Info.

Overview
Legend Attributes Display Setting Attributes Control Panel Toggle Buttons Mouse Mode Buttons Plot Options

3DEC Files Project File (*.3dprj) – The project file contains information related to a specific 3DEC project. This includes links to the data file and save file related to the project, the plot views generated for the project and the gui layout. Data File (*.3ddat) Save File (*.3dsav) Log File (*.log) – ASCII file listing 3DEC commands that represent the problem being analyzed – Binary file containing values of all state variables and user-defined conditions at stage that file is saved – ASCII file that records text appearing on the screen into a log file – Graphics plot file (in various standard formats) – String of PCX images that can be viewed as a “movie”

History File (*.his) – ASCII file record of input or output history values Plot File Movie File (*.dcx)

Tutorial Sliding Wedge
mass density bulk modulus shear modulus normal & shear joint stiffness joint friction angle 2000 kg/m3 1.0 Gpa 0.3 GPa 13.3 MPa/m 20o

dip = 30o dip direction = 270o

Model Building in 3DEC
Two approaches:
1) Cut up a large polygon into the desired geometry 2) Create separate polyhedra and connect them together

Model generation commands to create and shape a large polyhedron
POLY brick POLY face face . . POLY prism a xa1,ya1,za1 xa2,ya2,za2 ... b xb1,yb1,zb1 xb2,yb2,zb2 ... POLY tunnel keywords ... xl,xu yl,yu zl,zu xa1,ya1,za1 xa2,ya2,za2 ... xb1,yb1,zb1 xb2,yb2,zb2 ...

Model generation commands to cut up a large polyhedron

JSET TUNNEL POLY cube

keywords ... region n ...

POLY face & POLY brick
poly & face 0,0,0 1,0,0 1,1,0 0,1,0 & face 0,0,0 0,0,1 1,0,1 1,0,0 & face 0,0,0 0,1,0 0,1,1 0,0,1 & face 1,1,1 1,1,0 1,0,0 1,0,1 & face 1,1,1 1,0,1 0,0,1 0,1,1 & face 1,1,1 0,1,1 0,1,0 1,1,0

poly brick 0,1 0,1 0,1

POLY prism
poly prism a (0,0,0) (-.5,.87,0) (-.5,1.87,0) (0,2.74,0) & (1,2.74,0) (1.5,1.87,0) (1.5,.87,0) (1,0,0) & b (0,0,4) (-.5,.87,4) (-.5,1.87,4) (0,2.74,4) & (1,2.74,4) (1.5,1.87,4) (1.5,.87,4) (1,0,4)

POLY tunnel
poly tunnel rad=2 leng=-10,10 ratr=3.0 dip=0 dd=0 nr=2 nt=1 nx=3 delete -2 2, -10 10 -2 2 join on

join on

Fracture/joint representation in 3DEC
Fractures are represented by cuts in blocks Cuts must “knife” completely through a particular block Blocks can be hidden to avoid cutting Blocks can be joined at common faces to form concave blocks Fracture termination within block is accounted for by either:
adjusting rock stiffness using high strength for non-fracture portion of cut

Joint generation commands
JSET dip v1 dd v2 origin x y z persistence p num n spacing s id i HIDE/SEEK JOIN on/off

Definition of joint orientation
Up (z) North (y) β = Dip direction
ke lin e

0 ≤ α ≤ 90

α = Dip

0 ≤ β ≤ 360

St ri

East (x) Joint plane

right-handed system

3DEC 4.1 uses left-handed (CONFIG lhs) or right-handed (CONFIG rhs) coordinate systems (by default, right-handed) JSET creates single or multiple cuts HIDE and SEEK control continuity of cuts

JSET
poly brick 0,1 0,1 0,1 jset dip 0 dd 0 or 0,.5,0 ; create a block ; make a horizontal cut hide dip 0 dd 0 or 0,.5,0 below ; hide the bottom block jset dip 90 dd 90 or .5,0,0 seek ; vertical cut through top block only ; make all blocks visible

JSET
poly brick 0 80 -30 80 0 50 ; shallow-dipping fracture planes (continuous) jset dip 2.45 dd 235 org 30 0 12.5 jset dip 2.45 dd 315 org 35 0 30 ; high angle foliation planes (continuous) jset dip 76 dd 270 spac 16 num 3 org 30,0,12.5 ; intersecting discontinuities (non-continuous) hide range x 0,80 y 0,50 z 0,10 hide range x 55,80 y 0,50 z 0,50 jset dip 70 dd 200 org 0 35 0 jset dip 60 dd 330 org 50 15 50 seek hide range x 0,30 y -30,80 z 13,50

TUNNEL
config lh poly brick -1.5,1.5 -1.5,1.5 -1.5,1.5 tunnel radial region 1 & a (-0.30,0.00,-1.5) (-0.3,0.40,-1.5) (-0.25,0.47,-1.5) & (-0.15,0.52,-1.5) ( 0.0,0.55,-1.5) ( 0.15,0.52,-1.5) & ( 0.25,0.47,-1.5) ( 0.3,0.40,-1.5) ( 0.30,0.00,-1.5) & b (-0.30,0.00, 1.5) (-0.3,0.40, 1.5) (-0.25,0.47, 1.5) & (-0.15,0.52, 1.5) ( 0.0,0.55, 1.5) ( 0.15,0.52, 1.5) & ( 0.25,0.47, 1.5) ( 0.3,0.40, 1.5) ( 0.30,0.00, 1.5) remove region 1

Boundary locations
stress

displacement

Extreme grids – “tunnel” sizes are the same

Practical Exercise 1: Failure of a Jointed Rock Slope
jointed rock unit weight 20,000 N/m3 dip angle dip direction spacing joint normal & shear stiffness cohesion friction angle 76o 270o 4m 1.0 GPa/m 0 6o

Low angle joints - dip angle 2.5o

Practical Exercise 2: Stability Analysis of an Underground Excavation
joint plane 3 jointed rock unit weight bulk modulus 20,000 N/m3 1.5 GPa joint plane 2 joint plane 1

shear modulus 0.6 GPa three joint planes: 1. dip angle dip direction origin 2. dip angle dip direction origin 3. dip angle dip direction origin joint normal & shear stiffness joint cohesion 65o 270o 0.3,0.0,0.0 40o 230o 0.0,-0.3,0.0 50o 320o 0.0,0.0,0.3 1.0 GPa/m 0

run 3DEC

joint friction angle 6o


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