一种薄层接触单元的开发及FLAC^(3D)实现  

Development of A Thin-layer Interface Element and Its Implementation in FLAC^(3D)

作　　者：刘莹骏 张运良[1] 

机构地区：[1]大连理工大学建设工程学部,辽宁大连116024

出　　处：《水利与建筑工程学报》2014年第4期1-8,49,共9页Journal of Water Resources and Architectural Engineering

基　　金：国家自然科学基金(50809013);中国水利水电科学研究院开放基金(IWHRO2009019)

摘　　要：随着土木水利行业的蓬勃发展,出现越来越多岩土-结构相互作用的问题。虽然目前国内外学者研究出很多种类的接触面本构模型,但大多软件中的接触面模型甚为简单,如此便限制了软件对接触面问题的模拟。FLAC3D软件中的interface单元是简单的库伦滑移型无厚度接触单元,不能模拟接触面所能表现出的例如应变软化等特性。鉴此,基于塑性力学,首先提出了一种弹塑性本构模型。然后基于VC++语言,将此模型开发成适用于FLAC3D软件的薄层实体单元。最后用三个数值算例验证了所开发的单元和本构模型能反映接触面在弹性阶段的非线性,在塑性阶段的应变软化、大变形、法向剪胀及拉伸破坏等特性。用所开发的新单元代替原有的interface单元能提高FLAC3D模拟复杂接触特性的能力。With the vigorous development of civil engineering and hydraulic engineering ,there have been more and more problems about soil-structure interaction .Although there are many interface constitutive models brought up by scholars from home and abroad ,most of them are too simple to fulfill the task of simultating interface problems . Interfaces in FLAC3D are zero-thickness contact elements characterized by Coulomb sliding ,which cannot simulate such behaviors as strain-softening .Therefore ,based on the theory of plasticity ,an elasto-plastic constitutive model for soil-structure interaction interface was proposed firstly .Then ,the constitutive model was implemented by developing a thin-layer solid element on the software platform FLAC3D using VC＋ ＋ language .Finally ,three numerical examples were presented in detail to confirm the validity of the proposed model and the thin-layer element in describing nonlinear behaviors in the elastic range ,strain-softening ,large deformation and dilatancy behaviors in the shear direction ,as well as tensile failure in the normal direction during the plastic range .Using the new thin-layer element instead of the original interface element can improve the ability of simulating more complicated interface problems of FLAC3D .

关 键 词：接触面 薄层实体单元 弹塑性本构模型 FLAC^3D VC++语言 

分 类 号：TU45[建筑科学—岩土工程]