3DEC培训.pptx

UDEC/3DEC Short CourseItasca Software Training CourseTongji UniversityShanghai,ChinaOctober 27-31,2008Peter Cundall,Yanhui Han&Roger Hart Itasca Consulting Group,Inc.Training ScheduleOctober 29,2008(morning)09:00-10:153DEC Graphical Interface -The new graphical interface for creating and manipulating 3DEC output10:15-10:30 Break10:30-12:00 UDEC/3DEC Application -Model generation including joint structure creation -Simple exercises3DEC 4.10Graphics Capabilities3DEC Main Windowterminal interfaceplot viewsplot item and view controlsOverviewView AreaLegendControl Panel:Plot-item ListView Info.Element Info.OverviewLegend AttributesDisplay Setting AttributesControl Panel Toggle ButtonsMouse Mode ButtonsPlot Options3DEC FilesProject 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)ASCII file listing 3DEC commands that represent the problem being analyzedSave File(*.3dsav)Binary file containing values of all state variables and user-defined conditions at stage that file is savedLog File(*.log)ASCII file that records text appearing on the screen into a log fileHistory File(*.his)ASCII file record of input or output history valuesPlot File Graphics plot file(in various standard formats)Movie File(*.dcx)String of PCX images that can be viewed as a “movie”TutorialSliding Wedge mass density2000 kg/m3bulk modulus1.0 Gpashear modulus0.3 GPanormal&shearjoint stiffness13.3 MPa/mjoint friction angle20odip=30o dip direction=270oModel Building in 3DECTwo approaches:1)Cut up a large polygon into the desired geometry2)Create separate polyhedra and connect them togetherModel generation commands to create and shape a large polyhedronPOLY brick xl,xu yl,yu zl,zu POLY face xa1,ya1,za1 xa2,ya2,za2.face xb1,yb1,zb1 xb2,yb2,zb2.POLY prism a xa1,ya1,za1 xa2,ya2,za2.b xb1,yb1,zb1 xb2,yb2,zb2.POLY tunnelkeywords.Model generation commands to cut up a large polyhedronJSETkeywords.TUNNELregion n.POLY cubePOLY face&POLY brickpoly&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 1,1,0poly brick 0,1 0,1 0,1POLY prismpoly 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 tunnelpoly tunnel rad=2 leng=-10,10 ratr=3.0 dip=0 dd=0 nr=2 nt=1 nx=3delete -2 2,-10 10-2 2join onjoin onFracture/joint representation in 3DECFractures are represented by cuts in blocksCuts must“knife”completely through a particular blockBlocks can be hidden to avoid cuttingBlocks can be joined at common faces to form concave blocksFracture termination within block is accounted for by either:adjusting rock stiffnessusing high strength for non-fracture portion of cutJoint generation commandsJSET dip v1 dd v2 origin x y z persistence p num n spacing s id iHIDE/SEEKJOIN on/offDefinition of joint orientation3DEC 4.1 uses left-handed(CONFIG lhs)or right-handed(CONFIG rhs)coordinate systems (by default,right-handed)JSET creates single or multiple cutsHIDE and SEEK control continuity of cutsright-handed systempoly brick 0,1 0,1 0,1 ;create a blockjset dip 0 dd 0 or 0,.5,0 ;make a horizontal cuthide dip 0 dd 0 or 0,.5,0 below ;hide the bottom blockjset dip 90 dd 90 or.5,0,0 ;vertical cut through top block onlyseek ;make all blocks visibleJSETpoly brick 0 80-30 80 0 50;shallow-dipping fracture planes(continuous)jset dip 2.45 dd 235 org 30 0 12.5jset 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 0,10hide range x 55,80 y 0,50 z 0,50jset dip 70 dd 200 org 0 35 0jset dip 60 dd 330 org 50 15 50seekhide range x 0,30 y-30,80 z 13,50JSETconfig lhpoly brick-1.5,1.5 -1.5,1.5 -1.5,1.5tunnel 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 1TUNNELBoundary locationsExtreme grids “tunnel”sizes are the samestressdisplacementPractical Exercise 1:Failure of a Jointed Rock Slopejointed rockunit weight 20,000 N/m3dip angle 76odip direction 270ospacing 4 mjoint normal&shear stiffness 1.0 GPa/mcohesion 0friction angle 6oLow angle joints-dip angle 2.5oPractical Exercise 2:Stability Analysis of an Underground Excavationrun 3DECjointed rockunit weight 20,000 N/m3bulk modulus 1.5 GPashear modulus 0.6 GPa three joint planes:1.dip angle 65o dip direction 270o origin 0.3,0.0,0.02.dip angle 40o dip direction 230o origin 0.0,-0.3,0.03.dip angle 50o dip direction 320o origin 0.0,0.0,0.3joint normal&shear stiffness 1.0 GPa/mjoint cohesion 0joint friction angle 6ojoint plane 1joint plane 2joint plane 3