本文選題：變坡　切入點(diǎn)：長(zhǎng)隧洞　出處：《人民黃河》2017年06期 　論文類型：期刊論文

【摘要】：明滿流交替是長(zhǎng)隧洞常遇到的不利水流流態(tài),尤其是洞內(nèi)截留氣囊輸移現(xiàn)象會(huì)對(duì)隧洞結(jié)構(gòu)安全構(gòu)成威脅。通過試驗(yàn)研究,闡述了變坡長(zhǎng)導(dǎo)流隧洞洞內(nèi)流態(tài)的演變過程,指出隨著上游水位上升,洞內(nèi)水流流態(tài)呈現(xiàn)由水躍轉(zhuǎn)變?yōu)槊鳚M流交替、直至有壓流的演變過程,分析了典型流態(tài)下隧洞的泄流能力,得到了明滿流交替的流量系數(shù)介于無壓流和有壓流流量系數(shù)之間的結(jié)論。同時(shí)探討了明滿流交替過程的壓力波動(dòng),發(fā)現(xiàn)明滿流交替的壓力波動(dòng)持續(xù)時(shí)間較長(zhǎng)、振幅較大,但壓力峰值持續(xù)的時(shí)間很短,并且截留氣囊可有效減緩隧洞底部壓力波動(dòng)。
[Abstract]:The alternation of open and full flow is the unfavorable water flow pattern often encountered in long tunnel, especially the phenomenon of air bag transportation in tunnel will threaten the safety of tunnel structure. Based on the experimental study, the evolution process of internal flow state in diversion tunnel with variable slope length is expounded. It is pointed out that with the rise of the upstream water level, the water flow pattern in the tunnel changes from water jump to open flow alternately until the pressure flow, and the discharge capacity of the tunnel under the typical flow state is analyzed. A conclusion is drawn that the flow coefficient of open flow alternation is between pressure free flow and pressure flow flow coefficient. At the same time, the pressure fluctuation of open full flow alternation process is discussed. It is found that the pressure fluctuation of open full flow alternation is longer and the amplitude is larger. However, the peak pressure duration is very short, and retaining the airbag can effectively slow the pressure fluctuation at the bottom of the tunnel.
【作者單位】： 南京水利科學(xué)研究院;
【分類號(hào)】：TV134.3

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本文編號(hào)：1567258