【摘要】：波浪是影響近海結(jié)構(gòu)物穩(wěn)定性的重要因素,在循環(huán)波浪作用下,海床內(nèi)部孔隙水壓力會隨之產(chǎn)生循環(huán)交替變化,超孔隙水壓力的增長引起海床內(nèi)部應(yīng)力分布變化,使其抗剪強(qiáng)度減弱,對海床及上部結(jié)構(gòu)物穩(wěn)定性產(chǎn)生威脅。本文通過耦合開源流體力學(xué)軟件OpenFOAM和大型通用有限元分析軟件ABAQUS建立集成模型,對復(fù)合式筒型風(fēng)電基礎(chǔ)周圍海床在波浪作用下動力響應(yīng)進(jìn)行研究。論文主要內(nèi)容及結(jié)論如下:(1)建立三維海床響應(yīng)數(shù)值模型,與立波、行進(jìn)波作用下海床響應(yīng)實(shí)驗值和解析解進(jìn)行比較,驗證模型的合理性。(2)建立開源流體力學(xué)軟件Open FOAM和大型通用有限元分析軟件ABAQUS集成模型,對波浪作用下海上風(fēng)電復(fù)合筒型基礎(chǔ)周圍海床響應(yīng)進(jìn)行模擬。結(jié)果表明,復(fù)合筒型基礎(chǔ)背浪側(cè)邊緣處海床孔壓沿深度方向衰減速度較快,迎浪側(cè)孔壓衰減速度較慢;筒型基礎(chǔ)筒內(nèi)部從筒裙下部滲流傳入的孔壓較小,不易發(fā)生液化。(3)分析海床土體參數(shù)對筒型基礎(chǔ)周圍海床動力響應(yīng)的影響。認(rèn)為海床的各向異性越明顯,孔隙水壓的衰減速度越慢;海床透水性及剪切模量隨深度呈指數(shù)分布變化對孔壓衰減速度無明顯影響,線性分布則會使孔壓衰減速度變慢。(4)建立負(fù)壓沉入式筒型風(fēng)電基礎(chǔ)周圍海床響應(yīng)模型,對負(fù)壓沉入對海床孔隙水壓響應(yīng)的影響進(jìn)行了模擬分析。結(jié)果表明,施加的負(fù)壓值大小對復(fù)合式筒型基礎(chǔ)邊緣處孔壓分布影響較大,沉放下沉速度對海床中孔隙水壓分布不會造成明顯影響,未完全沉入筒型基礎(chǔ)會使其附近海床負(fù)壓減小,經(jīng)負(fù)壓沉入過程的海床液化范圍相比未經(jīng)沉入過程海床有所減小。(5)對實(shí)際工程條件下的海床響應(yīng)和液化進(jìn)行模擬分析,土體分層對波浪作用下海床響應(yīng)有一定的影響,兩種情況下復(fù)合式筒型基礎(chǔ)周圍海床均未發(fā)生液化。
[Abstract]:Wave is an important factor affecting the stability of offshore structures. Under the action of cyclic wave, the internal pore water pressure of the seabed will change alternately, and the increase of the excess pore water pressure will lead to the change of the stress distribution in the seabed. The shear strength is weakened and the stability of seabed and superstructure is threatened. In this paper, an integrated model is established by coupling the open-source hydrodynamic software OpenFOAM with the large-scale general finite element analysis software ABAQUS, and the dynamic response of the seabed around the composite cylindrical wind power foundation under wave action is studied. The main contents and conclusions of the paper are as follows: (1) A three-dimensional seabed response numerical model is established, which is compared with the experimental results and analytical solutions of the seabed response under the action of vertical wave and traveling wave. (2) the integrated model of open-source fluid dynamics software Open FOAM and large-scale general finite element analysis software ABAQUS is established to simulate the response of offshore wind power composite cylinder foundation around the sea bed under wave action. The results show that the pore pressure of the seabed at the edge of the back wave side of the composite cylindrical foundation attenuates faster along the depth direction, and the pore pressure at the wave side decreases more slowly. The pore pressure from the bottom of the cylinder skirt is small and the liquefaction is not easy. (3) the influence of the soil parameters of the seabed on the dynamic response of the seabed around the cylindrical foundation is analyzed. It is considered that the more obvious the anisotropy of the seabed is, the slower the attenuation rate of pore water pressure is. The variation of permeability and shear modulus with depth has no obvious influence on the attenuation velocity of pore pressure, but the linear distribution will slow down the attenuation rate of pore pressure. (4) the response model of seabed around the negative pressure immersed cylindrical wind power foundation is established. The influence of negative pressure sinking on the pore pressure response of seabed is simulated and analyzed. The results show that the value of negative pressure exerts a great influence on the pore pressure distribution at the edge of the composite cylindrical foundation, and the settling velocity has no obvious effect on the pore water pressure distribution in the seabed. If the submersible cylindrical foundation is not fully submerged, the negative pressure of the nearby seabed will be reduced, and the liquefaction range of the seabed during the process of sinking under negative pressure will be reduced compared with that of the seabed without sinking. (5) the response and liquefaction of the seabed under the actual engineering conditions are simulated and analyzed. Soil stratification has a certain effect on the response of the seabed under the wave action, and there is no liquefaction of the seabed around the composite cylindrical foundation in both cases.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV139.2

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