本文選題：伸縮縫 + 裂縫�。� 參考：《中國水利水電科學研究院》2017年碩士論文

【摘要】：大壩、隧洞、箱涵、渡槽等水工建筑物的滲漏不僅造成水量損失,同時影響水利工程運行安全,因此水工建筑物滲漏問題亟待解決。針對南水北調(diào)穿黃隧洞和天津干線箱涵防滲工程,中國水科院結構材料研究所李炳奇教授提出聚脲基復合防滲體系(EP_DTEW工法),該體系具有適應潮濕環(huán)境、與混凝土基材粘結良好、適應伸縮縫變形、環(huán)保無毒等優(yōu)點。本文基于損傷斷裂力學的界面內(nèi)聚力模型(CZM)有限元法,對該防滲體系的作用機理進行了仿真模擬,針對水工建筑物的裂縫及伸縮縫,研究表面涂層防滲體系結構、嵌縫材料防滲體系結構,在水壓及伸縮縫變形荷載工況下破壞過程,對聚脲基復合防滲體系的材料和結構給出了設計理論及方法。界面內(nèi)聚力模型應用于防滲結構的有限元計算研究在國內(nèi)尚屬首例。主要研究內(nèi)容如下:(1)進行了聚脲基復合防滲體系結構的試驗研究。分別對伸縮縫表面涂層結構及嵌縫結構進行了室內(nèi)壓水試驗,得到防滲涂層法向位移隨反向水壓變化的試驗數(shù)據(jù),以及嵌縫材料表面應變隨反向水壓變化的試驗數(shù)據(jù),為仿真計算模型參數(shù)確定提供了依據(jù)。計算及試驗結果對比分析表明,內(nèi)聚力模型能夠揭示防滲體系界面粘接層的破壞機理。(2)建立裂縫、伸縮縫的表面涂層防滲結構模型,該模型適用于基面產(chǎn)生及擴展裂縫、施工縫、低水壓伸縮縫等混凝土表面柔性防滲。采用雙線性內(nèi)聚力模型有限元法進行剝離破壞模擬,得到表面涂層荷載—法向位移曲線,與室內(nèi)壓水試驗數(shù)據(jù)進行比較,給出合理的界面內(nèi)聚力模型參數(shù)。進而分析了表面涂層厚度與水壓荷載的關系。同時,模擬了伸縮縫水壓和變形混合工況下,表面涂層厚度、彈性模量和界面內(nèi)聚力模型切向粘結強度對剝離長度的影響。對裂縫承受變形工況,探討涂層彈性模量改變對于界面破壞時伸縮縫變形的影響。為水工建筑物表面涂層防滲設計的材料及結構提供了理論依據(jù)和方法。(3)建立伸縮縫的嵌縫防滲結構模型,該模型適用于承受高反向水壓的伸縮縫防滲結構。采用指數(shù)內(nèi)聚力模型有限元法進行剝離破壞模擬,得到嵌縫材料荷載—應變曲線,與室內(nèi)壓水試驗數(shù)據(jù)進行比較,給出合理的界面內(nèi)聚力模型參數(shù)。進而分析了嵌縫材料彈性模量、泊松比變化對水壓荷載的影響,給出了嵌縫材料深度與水壓荷載的關系。進一步,在嵌縫材料承受反向水壓后,施加伸縮縫變形工況下,嵌縫材料深度、伸縮縫寬度變化時,界面破壞時伸縮縫變形值的變化情況。伸縮縫變形后,施加水壓荷載的工況下,給出嵌縫材料深度及嵌縫材料的力學性能變化與水壓荷載的關系。為嵌縫防滲體系的材料及結構設計提供了理論依據(jù)和方法。本研究為合理選擇界面內(nèi)聚力模型參數(shù)、準確預測聚脲基復合防滲體系界面破壞時水壓和伸縮縫變形提供技術支撐,研究結果為伸縮縫防滲體系設計提供理論支持和指導。
[Abstract]:The leakage of hydraulic structures, such as dam, tunnel, box culvert and aqueduct, not only causes water loss, but also affects the operation safety of water conservancy projects. Therefore, the leakage of hydraulic structures should be solved urgently. Professor Li Bingqi of the Institute of structural materials of the China Academy of water science and Engineering has put forward the compound of polyurea based on the south to North Water Diversion Tunnel and the trunk culvert of Tianjin trunk line. The anti seepage system (EP_DTEW method) has the advantages of adapting to the wet environment, adhering to the concrete base material well, adapting to the deformation of the expansion joint and the non toxic and so on. This paper is based on the interfacial cohesion model (CZM) finite element method based on the damage fracture mechanics, and simulated the action mechanism of the seepage control system, aiming at the cracks in the hydraulic structure and the cracks and the cracks in the hydraulic structure. The structure of the anti-seepage system of surface coating, the structure of the seeping proof system, the failure process of the water pressure and the deformation load of the expansion joint are studied. The design theory and method of the material and structure of the polyurea composite anti-seepage system are given. The finite element calculation of the interface cohesive model applied to the seepage control structure is the first case in China. The main research contents are as follows: (1) the experimental study on the structure of the composite anti-seepage system of the polyurea base was carried out. The indoor pressure water test was carried out on the surface coating structure and the seam structure of the expansion joint respectively. The experimental data of the change of the normal displacement with the reverse water pressure of the impervious coating and the experimental data on the variation of the surface strain with the reverse water pressure on the surface of the seams were obtained. The calculation and test results show that the cohesive force model can reveal the failure mechanism of the interface bonding layer of the seepage proof system. (2) the model of the surface coating anti seepage structure of the cracks and the expansion joints is established. The model is suitable for the mixing of the base surface and the expansion cracks, the construction joints, the low hydraulic expansion joints and so on. With the bilinear cohesive model finite element method, the bilinear cohesive force model is used to simulate the stripping failure, and the surface coating load - normal displacement curve is obtained. The reasonable interface cohesion model parameters are compared with the indoor pressure water test data, and the relationship between the thickness of the surface coating and the hydraulic load is analyzed. The influence of surface coating thickness, modulus of elasticity and tangential bond strength of cohesive force model on peeling length under the mixed conditions of water pressure and deformation of contraction joints. The effect of the change of elastic modulus of coating on the deformation of expansion joint during interface failure is discussed. The theoretical basis and method are provided. (3) the model of the seture anti seepage structure of the expansion joint is established. This model is suitable for the seepage prevention structure of the expansion joint with high reverse water pressure. The simulation of the peeling failure is carried out by the finite element method of the exponential cohesion model, and the load strain curve of the seam material is obtained, and it is compared with the indoor pressure water test data. The influence of the elastic modulus of the joint material and the change of Poisson's ratio on the hydraulic load is analyzed, and the relationship between the depth of the seam material and the hydraulic load is given. Further, the interface failure is damaged when the seam material is subjected to the reverse hydraulic pressure to apply the depth of the joint material and the width of the expansion joint under the deformation condition of the expansion joint. The change of the deformation value of the expansion joint. After the deformation of the expansion joint, the relationship between the depth of the seam material and the mechanical properties of the sewn material and the hydraulic load is given under the condition of applying the water pressure load. This provides a theoretical basis and method for the material and structure design of the seture anti-seepage system. This study is a reasonable choice of the parameters of the cohesive force model. It provides technical support for the accurate prediction of water pressure and expansion joint deformation when the interface damage of the polyurea composite anti-seepage system is destroyed. The research results provide theoretical support and guidance for the design of the expansion joint seepage control system.

【學位授予單位】：中國水利水電科學研究院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TV543

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