土—结构薄层接触单元的开发及其应用

发布时间：2019-07-09 20:05

【摘要】：随着土木水利工程的蓬勃发展,出现了越来越多的土-结构相互作用问题,受到了众多学者的重视。在荷载作用下,土和结构之间的完全接触不能保证,二者的相对滑移和分离,需要合适的接触单元和本构模型进行模拟。虽然国内外学者研究出了很多种类的接触面本构模型,但大多数数值计算软件并没有反映和采纳。例如,岩土工程专业软件FLAC3D中的Interface单元不能模拟接触面弹性阶段的非线性,以及塑性阶段的应变软化特性,限制了软件对接触面问题模拟的应用。本文提出了一种弹塑性接触面本构模型,并基于VC++语言开发成适用于FLAC3D软件的薄层实体接触单元。通过三个数值算例,验证了所开发模型和薄层接触单元的有效性,并应用于某埋地输水暗涵的静动受力和变形研究。论文的主要工作如下： (1)介绍了国内外学者进行的接触面试验,总结了用于模拟接触面的本构模型及接触面单元。 (2)着重论述本文所开发的薄层接触实体单元的弹塑性本构模型,及其在FLAC3D软件中的差分迭代格式和在VC++程序中的编程概要。 (3)三个接触面试验算例验证了所开发单元及本构模型能够有效模拟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。 (4)采用所开发的接触面单元及本构模型,对某埋地暗涵进行二维和三维模拟。 (5)总结论文的内容,并分析所提出接触面本构模型的不足之处,对后续工作做出展望。
文内图片：

图片说明：提取的第一主应力时程的单元Fig.5.17Elementsofwhichthel^^(Max)principalcontourstresshistorieswouldbeextracted
[Abstract]:With the vigorous development of civil and water conservancy projects, there are more and more problems of soil-structure interaction, which have been paid more and more attention by many scholars. Under the action of load, the complete contact between soil and structure can not be guaranteed. The relative slip and separation of soil and structure need suitable contact element and constitutive model to simulate. Although many kinds of contact surface constitutive models have been developed by scholars at home and abroad, most of the numerical calculation software has not been reflected and adopted. For example, the Interface element in the geotechnical engineering software FLAC3D can not simulate the nonlinear of the elastic stage of the contact surface and the strain softening characteristics of the plastic stage, which limits the application of the software to the simulation of the contact surface problem. In this paper, an elastic-plastic contact surface constitutive model is proposed, and a thin layer solid contact element suitable for FLAC3D software is developed based on VC language. Three numerical examples are given to verify the effectiveness of the developed model and thin layer contact element, and it is applied to the study of static and dynamic stress and deformation of a buried water transport culvert. The main work of this paper is as follows: (1) the contact surface test carried out by scholars at home and abroad is introduced, and the constitutive model and contact surface element used to simulate the contact surface are summarized. (2) the elastic-plastic constitutive model of thin layer contact solid element developed in this paper, the difference iterative scheme in FLAC3D software and the programming outline in VC program are discussed in detail. (3) three contact surface test examples show that the developed element and constitutive model can effectively simulate the nonlinear of the contact surface in elastic stage, strain soften, large deformation, normal shear expansion and tensile failure in plastic stage. (4) the two-dimensional and three-dimensional simulation of a buried culvert is carried out by using the developed contact surface element and constitutive model. (5) summarize the contents of the paper, analyze the shortcomings of the proposed contact surface constitutive model, and make a prospect for the follow-up work.
【学位授予单位】：大连理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV312

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