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Implementacija in verifikacija konstitutivnega modela vmesne ploskve geosintetik-zemljina v elementu Geogrid programa FLAC
3
D
^{3D}
3
D
Authors
Wu Haimin
Dai Linjun
Shu Yiming
Teng Zhaoming
Publication date
14 June 2018
Publisher
Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru
Abstract
Due to the complexity of geosynthetic-soil interactions, the simple interface constitutive models embedded in the geosynthetic elements of general computing software cannot satisfy the requirements for a numerical simulation of different geosynthetic-soil interface behaviours. Based on the direct shear test results of a composite geomembrane (CGM) and polyurethane (PUR) mixed crushed stones interface, a nonlinear elastic, perfectly plastic model was used to describe the interface behaviours. The method of incorporating an interface constitutive model into the Geogrid element of a fast Lagrange analysis of continua in three dimensions (FLAC3D) procedure was presented in detail through a user-defined program in the FISH environment. Then the incorporated model of the Geogrid element was used to simulate the direct tests of the CGM-PUR mixed crushed stones interface. The results of the numerical tests confirmed the validity and reliability of the incorporated model. The method and program flowchart for implementing the nonlinear elastic, perfectly plastic interface constitutive model into the Geogrid element can provide a reference for users who want to simulate other geosynthetic-soil interface behaviours with FLAC3D.Zaradi zapletenosti interakcije med geosintetikom in zemljino, enostavni konstitutivni modeli za vmesne ploskve, ki so vgrajeni v geosintetične elemente splošnih računalniških programov, ne zadovoljujejo zahtev za numerično simulacijo različnih odzivov na vmesni ploskvi med geosintetikom in zemljino. Na osnovi rezultatov direktnega strižnega preizkusa kompozitne vmesne ploskve iz geomembrane (CGM) in poliuretana (PUR) zmešanega z drobljenim kamenjem, je bil za opis obnašanja vmesne ploskve uporabljen nelinearno elastičen idealno plastičen model. S pomočjo uporabniško definiranega programa v okolju FISH je detajlno predstavljena metoda vključitve konstitutivnega modela vmesne ploskve v element Geogrid postopka hitre Lagrangeeve tridimenzionalne analize kontinua. Nato je bil konstitutivni model elementa Geogrid uporabljen za simulacijo direktnega strižnega preizkusa vmesne ploskve CGM-PUR zmešanima z drobljenim kamenjem. Rezultati numeričnih preizkusov so potrdili veljavnost in zanesljivost vključenega modela. Predstavljena metoda in diagram poteka za implementacijo nelinearno elastičnega idealno plastičnega konstitutivnega modela vmesne ploskve v element Geogrid podajata napotek uporabnikom, ki želijo simulirati drugačna obnašanja vmesne ploskve med geosintetikom in zemljine s pomočjo FLAC3D
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Last time updated on 19/06/2018