【摘要】：跨海橋梁一般修建在河口入海口及海岸線各水域,這些地方環(huán)境比較惡劣,為橋梁基礎(chǔ)的施工及后期管養(yǎng)均帶來了巨大的挑戰(zhàn)�？绾蛄捍蠖嗖捎么罂缃Y(jié)構(gòu)、深水基礎(chǔ),是典型的深水橋梁。與內(nèi)陸橋梁相比,深水橋梁的下部結(jié)構(gòu)和基礎(chǔ)除了承受自重荷載、交通荷載以外,還遭受波浪、水流等海洋動力荷載的侵襲。鑒于樁基具有抗震性能好、承載力高、沉降小的優(yōu)勢,目前所建的深水跨海橋梁基礎(chǔ)形式多采用樁基-承臺復(fù)合基礎(chǔ),因此本文主要針對樁基-承臺復(fù)合基礎(chǔ)的波浪荷載展開研究。本文通過求解RANS方程和κ-ε湍流模型,基于CFD軟件FLOW-3D建立了波浪與樁-承臺復(fù)合基礎(chǔ)相互作用的三維數(shù)值模型,并基于此模型研究了樁-承臺復(fù)合基礎(chǔ)所受波浪荷載。主要研究內(nèi)容包括:(1)基于FLOW3D軟件分別建立二維數(shù)值波浪水槽與波浪-結(jié)構(gòu)物相互作用的數(shù)值模型,通過與解析結(jié)果及以往實驗結(jié)果進(jìn)行對比,驗證了本文數(shù)值模型的合理性。在確定本文水槽模型的準(zhǔn)確性后,進(jìn)一步建立了波浪與樁-承臺復(fù)合基礎(chǔ)相互作用的三維數(shù)值模型。(2)研究了承臺淹沒深度對復(fù)合基礎(chǔ)周圍流場特征及所受波浪荷載的影響,并進(jìn)一步探討了波浪參數(shù)對復(fù)合基礎(chǔ)波浪荷載隨承臺淹沒深度變化規(guī)律的影響。(3)研究了波浪入射角對復(fù)合基礎(chǔ)周圍流場特征及所受波浪荷載的影響,并進(jìn)一步探討了波浪參數(shù)對復(fù)合基礎(chǔ)波浪荷載隨波浪入射角變化規(guī)律的影響。(4)以平潭海峽公鐵兩用大橋某橋梁基礎(chǔ)為工程對象,研究了承臺淹沒深度及波浪入射角對復(fù)合基礎(chǔ)波浪荷載影響,從而進(jìn)一步驗證了本文第三、四章得到的相關(guān)結(jié)論,最后同時考慮承臺淹沒深度及波浪入射角,給出了平潭海峽公鐵兩用大橋橋梁基礎(chǔ)波浪荷載隨承臺淹沒深度及波浪入射角的變化曲線。
[Abstract]:Generally, cross-sea bridges are built in estuaries and coastal waters. The environment in these areas is rather bad, which brings great challenges to the construction of the bridge foundation and the later maintenance of the bridge. Most of the cross-sea bridges use long-span structure, deep-water foundation, is a typical deep-water bridge. Compared with inland bridge, the substructure and foundation of deep-water bridge not only bear self-weight load, traffic load, but also suffer from ocean dynamic loads such as wave, current and so on. Because the pile foundation has the advantages of good seismic performance, high bearing capacity and small settlement, the pile foundation-cap composite foundation is often used in the deep-water bridge foundation form at present. Therefore, the wave load of pile-cap composite foundation is studied in this paper. In this paper, by solving RANS equation and 魏-蔚 turbulence model, a three-dimensional numerical model of wave-pile-cap composite foundation interaction is established based on CFD software FLOW-3D. Based on this model, the wave load on pile-cap composite foundation is studied. The main contents are as follows: (1) the two-dimensional numerical model of wave-structure interaction is established based on FLOW3D software, and the numerical model is compared with the analytical results and the previous experimental results. The rationality of the numerical model is verified. After determining the accuracy of this model, A three-dimensional numerical model of the interaction between wave and pile-cap composite foundation is established. (2) the influence of the submerged depth of the cap on the characteristics of the surrounding flow field and the wave load on the composite foundation is studied. The influence of wave parameters on the variation of wave load with cap depth is further discussed. (3) the influence of wave incident angle on the flow field around the composite foundation and the wave load on the composite foundation are studied. Furthermore, the influence of wave parameters on the variation of wave load with wave incident angle is discussed. (4) A bridge foundation of Pingtan Straits Highway and Railway Bridge is taken as the engineering object, and the influence of wave parameters on the wave load of composite foundation with wave incident angle is also discussed. The influence of cap submergence depth and wave incident angle on wave load of composite foundation is studied, and the relevant conclusions obtained in chapters 3 and 4 of this paper are further verified. Finally, the submergence depth and wave incident angle of cap are considered at the same time. The variation curves of wave load on the foundation of Pingtan Straits Bridge with submerged depth of cap and wave incident angle are given.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U443.15

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