本文選題：隧道工程　切入點(diǎn)：沉管隧道　出處：《巖石力學(xué)與工程學(xué)報(bào)》2014年S1期 　論文類型：期刊論文

【摘要】：管節(jié)在沉放過程中受河流環(huán)境影響較大,現(xiàn)運(yùn)用計(jì)算流體力學(xué)方法,數(shù)值實(shí)現(xiàn)管節(jié)在不同流速、水位等河流工況下沉放的全過程,得出沉管隧道管節(jié)下沉過程中管節(jié)側(cè)壁的附加壓強(qiáng)等數(shù)據(jù)。分析結(jié)果表明:在管節(jié)下沉過程中,管節(jié)一半進(jìn)入基槽時(shí)為特殊位置,此時(shí)上下、左右壓力差值出現(xiàn)較大波動(dòng);左右側(cè)壓力差作用點(diǎn)上移,上下面最小壓力差作用點(diǎn)之間的距離隨管節(jié)沉放達(dá)到最大,此時(shí)管節(jié)在上下面作用力下受到的彎矩最大;河流水位對(duì)管節(jié)側(cè)壁附加壓力影響不顯著,對(duì)最大壓力差作用點(diǎn)位置產(chǎn)生對(duì)應(yīng)的提前、延緩;河流流速對(duì)側(cè)壁附加壓力差影響顯著,得出管節(jié)進(jìn)入特殊位置前后管節(jié)側(cè)壁壓強(qiáng)差值變化梯度與河流速度的關(guān)系,并給出擬合曲線。該分析結(jié)果可為管節(jié)沉放提供借鑒。
[Abstract]:The pipe joints are greatly affected by the river environment in the course of sinking. In this paper, using the method of computational fluid dynamics (CFD), the whole process of pipe node sinking and releasing under different flow velocity and water level is realized numerically. The additional pressure and other data of the side wall of the pipe joint during the sinking process of the immersed pipe tunnel are obtained. The analysis results show that in the course of the pipe node sinking, the half of the pipe node is in a special position when it enters the base groove, and the pressure difference between the left and the right is fluctuated greatly at this time. The distance between the upper and lower minimum pressure difference points reached the maximum with the sinking of the pipe joint, and the moment of the pipe joint was the largest under the upper and lower forces, while the river water level had no significant effect on the additional pressure on the side wall of the pipe joint. The influence of river velocity on the additional pressure difference of side wall is significant, and the relationship between the gradient of pressure difference of side wall and river velocity before and after the pipe node entering a special position is obtained. The fitting curve is given. The results can be used for reference.
【作者單位】： 華南理工大學(xué)土木與交通學(xué)院;華南理工大學(xué)亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金資助項(xiàng)目(51108190) 華南理工大學(xué)亞熱帶建筑科學(xué)國(guó)家重點(diǎn)實(shí)驗(yàn)室自主研究課題資助項(xiàng)目(2012ZC27)
【分類號(hào)】：U455.46

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