本文選題：鐵路隧道 + 長(zhǎng)大隧道��； 參考：《北京交通大學(xué)學(xué)報(bào)》2017年01期

【摘要】：基于現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)對(duì)寒區(qū)長(zhǎng)大隧道內(nèi)溫度的變化規(guī)律進(jìn)行了分析,基于數(shù)值仿真分析對(duì)不同環(huán)境氣溫、圍巖原始地溫、自然風(fēng)速、列車運(yùn)行速度和頻率條件下隧道洞內(nèi)溫度場(chǎng)和凍結(jié)深度的變化規(guī)律及保溫層的適用范圍進(jìn)行了研究.研究結(jié)果表明:若環(huán)境氣溫或圍巖原始地溫低,自然風(fēng)速大,或列車運(yùn)行速度大和運(yùn)行頻率高,則洞內(nèi)可能出現(xiàn)負(fù)溫分布,所以寒區(qū)長(zhǎng)大隧道結(jié)構(gòu)防寒不應(yīng)僅在洞口段;保溫層法不能完全解決寒區(qū)長(zhǎng)大隧道洞口保溫問題,當(dāng)環(huán)境氣溫低于15℃,持續(xù)凍結(jié)時(shí)間超過45d時(shí),需要采取主動(dòng)保溫措施.
[Abstract]:Based on the field measured data, the variation law of temperature in the long tunnel in cold region is analyzed. Based on the numerical simulation, the temperature of different environment, the original ground temperature of surrounding rock, and the natural wind speed are analyzed. The variation law of temperature field and freezing depth in tunnel and the applicable range of insulation layer are studied under the condition of train speed and frequency. The results show that if the ambient air temperature or the original ground temperature of surrounding rock is low, the natural wind speed is large, or the train running speed and running frequency are high, the negative temperature distribution may occur in the tunnel, so the cold prevention of the tunnel structure in cold region should not be only in the section of the tunnel entrance; The insulation layer method can not completely solve the problem of insulation at the entrance of long tunnel in cold region. When the ambient temperature is lower than 15 鈩，

本文編號(hào)：1984721