DEM yog ib txoj hauv kev ua lej tsim nyob rau hauv thaj chaw ntawm geotechnical engineering los simulate cov txheej txheem ntawm cov pob zeb loj thiab cov pawg particle. DEM simulates kev sib tsoo ntawm cov khoom ntws. FEM yog ib txoj kev txiav txim siab uas faib cov khoom tshawb fawb mus rau hauv qhov tsawg kawg nkaus ntawm cov chav me me, thiab ob chav nyob ib sab yog txuas nrog cov nodes.mineral sizershloov cov loads sab nraud ua rau lub caij mus rau qhov sib npaug ntawm qhov load vectors raws li lub hauv paus ntsiab lus ntawm qhov sib npaug ntawm qhov sib npaug thiab tom qab ntawd txheeb xyuas cov quab yuam sib xws. Nyob rau hauv daim ntawv no, unidirectional coupling tau saws, thiab cov ntaub ntawv ntws tau los ntawm lub discrete element yog input mus rau hauv lub finite element xam raws li ib tug load, thiab ces cov khoom raug soj ntsuam statically los yog dynamically, raws li qhia nyob rau hauv daim duab 1. Cov kev sib cuag load ntawm tawg hais nyob rau hauv tus qauv yog muab los ntawm discrete element xam rau hauv lub tsis muaj load.
Cov nyhuv ntawm cov khoom ntawm cov qauv raug txheeb xyuas, thiab tag nrho cov deformation, sib npaug kev ntxhov siab thiab sib npaug sib npaug, uas tuaj yeem ua lub hauv paus rau kev tshuaj xyuas ntxiv. (1) Tsim cov qauv particle Lub sab nrauv contour qauv ntawm lubcov khoom sizersyog tsim los ntawm peb- qauv qauv software. Cov khoom me me tau ntim rau hauv cov contour sab nraud, thiab qee lub zog tau siv los ua kom cov khoom me me uas muaj nyob rau hauv contour tag nrho kev sib cuag thiab nyob rau hauv ib qho kev sib npaug thiab ruaj khov. Tom qab ntawd qhov chaw ua haujlwm ntawm txhua qhov me me tau txais thiab cov ntaub ntawv API tau muab tso ua ke. Nyob rau hauv daim ntawv no, peb -dimensional modeling yog ua ntej, thiab cov ntaub ntawv ntawm lub voos xwmfab thiab ellipsoid yog tsim, uas yog nkag mus rau hauv discrete element method software EDEM. Kev sib sau ua ke ntau dhau yuav ua rau cov khoom tawg tam sim tom qab sau. Rau kev sau tus naj npawb ntawm cov khoom me me, txoj kev suav yog
a VReal=NV Fraction lub ntim ntim feem hauv cov qauv: V lub ntim ntawm sab nraud contour qauv ntawm cov khoom: N qhov ntim ntawm cov khoom me me; Ib me me particle ntim ntawm VFaction. Nyob rau hauv daim ntawv no, lub cheeb ntawm cuboid hais yog 25 hli thiab tus naj npawb yog 137, thiab lub ntim tom qab sau yog 0.002m3. Txoj kab uas hla ntawm ellipsoid hais yog 25 hli thiab tus naj npawb ntawm txhaws yog 68. Lub ntim tom qab filling yog 0.001m3
Thaum cov khoom me me raug sib koom ua ke los ntawm kev sib koom ua ke ntawm cov qauv (Bond), yuav muaj kev sib tshooj ntawm cov khoom, tus nqi ntawm qhov uas qhia txog qhov deformation thiab tawg tsis kam ntawm cov khoom. Qhov loj dua lub vojvoog, qhov loj dua qhov deformation ntawm cov khoom yuav raug ruptured, ntawm qhov tsis sib xws, qhov me me deformation yuav tsim rupture. Particle pawg yog tsim los ntawm adhesion ntawm cov khoom. Qhov luaj li cas ntawm cov ntxhia sizers bonding quab yuam yog txiav txim siab los ntawm Critical Normal Stress thiab Critical Shear Stress ntawm cov khoom, piv txwv li, lub zog compressive thiab lub zog shear.
(2) in the EDEM software, the collision model between particles is selected as Hertz--Mindin with Bond Built--in, and the collision model between particles and geometry is Hertz--Mindin with Bond Built--in, particle volume force model is compiled API file. Set the material properties of the particles and geometry, as well as the interaction properties between the materials, as shown in Table 1. In this paper, b450mm×500mm tooth roller with javelin tooth shape is adopted. Specific parameters are shown in Table 2. 2. The center distance of the double tooth roll L ensures that the distance between the tooth tip of the tooth roll and the tooth surface of another tooth roll is greater than the particle diameter, that is, L>D. Thawj txoj hauj lwm ntawm 2-cov hniav rau cov menyuam kom paub meej tias cov hniav kab yog staggered, thiab cov hniav ntawm ib yob yog muab tso rau hauv nruab nrab ntawm 4 cov hniav nyob rau saum npoo ntawm lwm yob. Tus naj npawb ntawm cubes thiab ellipsoids yog 10, uas yog tsim los ntawm tus nqi ntawm 5,000 s. Cov txheej txheem simulation tau qhia hauv daim duab 4.
(3) Finite element analysis Tsim DEM Solutions module hauv Workbench, thiab xa cov teeb meem quab yuam tau los ntawm EDEM mus rau hauv Workbench. Cov txheej txheem zoo li qub tau tsim, cov qauv geometric ntawm cov pob zeb loj cov hniav yob tau qhia, thiab cov neeg kho tshuab interface tau nkag mus. Cov khoom siv, qhov ceev thiab Poisson qhov piv ntawm pob zeb hauv ob sab phlu tau txhais raws li. Tom qab kev faib mesh, cov kev txwv yog ntxiv los thauj cov khoom quab yuam ntawm cov hniav rau cov hniav.