本文選題：滲透率 + 慣性阻力系數(shù)�。� 參考：《冰川凍土》2014年04期

【摘要】：氣候變暖背景下,塊石路基及通風(fēng)管-封閉塊石基底復(fù)合路基成為多年凍土區(qū)高等級公路冷卻路基的主要結(jié)構(gòu)形式.為探明不同直徑塊石層的滲流特征和規(guī)律,開展了立方排列球體室內(nèi)風(fēng)洞試驗,一方面獲得了滲透率和慣性阻力系數(shù)及其與球體直徑間的統(tǒng)計關(guān)系;另一方面得到了球體層內(nèi)部壓力梯度與滲流速度呈二次非線性關(guān)系.基于該試驗得到的參數(shù)和關(guān)系,采用多孔介質(zhì)中流固耦合傳熱模型,通過有限體積法模擬了柴木鐵路塊石路基的降溫效果,并利用實測數(shù)據(jù)驗證了模型及參數(shù)的可靠性.在此基礎(chǔ)之上,以青藏高等級公路特殊路基為原型,使用該傳熱模型開展了封閉塊石基底路基和通風(fēng)管-塊石復(fù)合路基長期冷卻降溫效果的數(shù)值模擬研究.結(jié)果表明:封閉塊石基底路基和通風(fēng)管-封閉塊石復(fù)合路基在研究期內(nèi)均有降溫效果,可以提高路基下人為上限,而塊石夾層路基在一定時期內(nèi)可以提高凍土上限,但下部土體溫度升高,長期降溫效果較差.
[Abstract]:Under the background of climate warming, rock block subgrade and ventilation tube-block rock base composite subgrade have become the main structural forms of high grade highway cooling subgrade in permafrost region. In order to find out the percolation characteristics and rules of different diameter block rock beds, the indoor wind tunnel test of cubic spherical array was carried out. On the one hand, the permeability, inertia resistance coefficient and the statistical relationship between permeability and spherical diameter were obtained. On the other hand, the quadratic nonlinear relationship between the pressure gradient and the seepage velocity is obtained. Based on the parameters and relationships obtained from the experiment, the fluid-solid coupled heat transfer model in porous media is used to simulate the cooling effect of block rock subgrade of Qaimu railway by finite volume method, and the reliability of the model and parameters is verified by the measured data. On this basis, the numerical simulation of the cooling and cooling effect of the closed rock base subgrade and the ventilation tube-block composite subgrade is carried out with the special subgrade of Qinghai-Xizang high grade highway as the prototype and the heat transfer model is used to study the long-term cooling and cooling effect of the roadbed. The results show that both the closed stone base subgrade and the ventilation tube-block block composite subgrade have cooling effect during the study period, which can increase the artificial upper limit of the roadbed, while the upper limit of the frozen soil can be increased in a certain period of time. But the lower soil temperature increases, the long-term cooling effect is poor.
【作者單位】： 甘肅省交通科學(xué)研究院有限公司;中國科學(xué)院寒區(qū)旱區(qū)環(huán)境與工程研究所凍土工程國家重點(diǎn)實驗室;中交第二公路工程局有限公司;天津市地下鐵道集團(tuán)有限公司;
【基金】：凍土工程國家重點(diǎn)實驗室開放基金項目(SKLFSE201107) 國家自然科學(xué)基金項目(41271080);國家自然科學(xué)基金創(chuàng)新群體項目(41121061)資助 國家重點(diǎn)基礎(chǔ)研究發(fā)展計劃(973計劃)項目(2012CB026102) 中國科學(xué)院西部行動計劃項目(KZCX2-XB3-19)
【分類號】：U416.1

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