【摘要】：隨著土木水利工程的蓬勃發(fā)展,出現(xiàn)了越來越多的土-結(jié)構(gòu)相互作用問題,受到了眾多學(xué)者的重視。在荷載作用下,土和結(jié)構(gòu)之間的完全接觸不能保證,二者的相對滑移和分離,需要合適的接觸單元和本構(gòu)模型進行模擬。雖然國內(nèi)外學(xué)者研究出了很多種類的接觸面本構(gòu)模型,但大多數(shù)數(shù)值計算軟件并沒有反映和采納。例如,巖土工程專業(yè)軟件FLAC3D中的Interface單元不能模擬接觸面彈性階段的非線性,以及塑性階段的應(yīng)變軟化特性,限制了軟件對接觸面問題模擬的應(yīng)用。 本文提出了一種彈塑性接觸面本構(gòu)模型,并基于VC++語言開發(fā)成適用于FLAC3D軟件的薄層實體接觸單元。通過三個數(shù)值算例,驗證了所開發(fā)模型和薄層接觸單元的有效性,并應(yīng)用于某埋地輸水暗涵的靜動受力和變形研究。論文的主要工作如下： (1)介紹了國內(nèi)外學(xué)者進行的接觸面試驗,總結(jié)了用于模擬接觸面的本構(gòu)模型及接觸面單元。 (2)著重論述本文所開發(fā)的薄層接觸實體單元的彈塑性本構(gòu)模型,及其在FLAC3D軟件中的差分迭代格式和在VC++程序中的編程概要。 (3)三個接觸面試驗算例驗證了所開發(fā)單元及本構(gòu)模型能夠有效模擬接觸面在彈性階段的非線性,在塑性階段的應(yīng)變軟化、大變形、法向剪脹及拉伸破壞等特性。 (4)采用所開發(fā)的接觸面單元及本構(gòu)模型,對某埋地暗涵進行二維和三維模擬。 (5)總結(jié)論文的內(nèi)容,并分析所提出接觸面本構(gòu)模型的不足之處,對后續(xù)工作做出展望。
文內(nèi)圖片：
圖片說明：提取的第一主應(yīng)力時程的單元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.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV312

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