| 多年冻土区封闭条件下片块石路基降温效果数值分析 |
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| 引用本文： | 奚家米,张世雷,陈建兵,陈冬根,董元宏.多年冻土区封闭条件下片块石路基降温效果数值分析[J].路基工程,2015,0(5):1. |
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| 作者姓名： | 奚家米 张世雷 陈建兵 陈冬根 董元宏 |
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| 作者单位： | 1.西安科技大学建筑与土木工程学院, 西安 710054 |
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| 基金项目： | 国家科技支撑计划(2014BAG05B01,2014BAG05B03,2014BAG05B07);交通运输部重大专项(2013-318-490-010);交通运输部应用基础研究项目(2012-319-495-030) |
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| 摘 要： | 片块石路基是多年冻土区公路建设中的一种主动降温的措施,根据多孔介质对流传热理论,对封闭边界的片块石路基温度场进行数值模拟计算,分析在全球气温变暖和沥青路面强吸热特性双重影响下的片块石路基的降温效果,并对其长期热稳定性进行预测分析。结果表明:片块石路基能够很好地发挥"热二极管"效应,寒季增加路基的蓄冷量,暖季可有效阻止外界热空气进入路基,对于防止多年冻土融化、主动保护冻土起到了积极有效的作用;片块石路基在短期内降温效果显著,但从长远分析,片块石单独应用于多年冻土地区公路路基中难以发挥主动降低地温、保护多年冻土和维护路基热稳定性的作用,必须进行补强。
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| 关 键 词： | 道路工程 片块石路基 多年冻土 温度场 数值模拟 |
| 收稿时间： | 2019-11-06 |
Numerical Simulation on Cooling Effect of Closed Rubble/Block Stone Embankment in Permafrost Areas |
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| Abstract: | Rubble/block stone embankment is an active cooling measure for highway construction in permafrost regions.According to the convective heat transfer theory of porous media,this paper carried out numerical simulation on the temperature field of rubble/block stone embankment with closed boundary to analyze the cooling effect thereof under dual influence of global warming and asphalt pavement’s strong endothermic character,and predicted its long-term thermal stability.The result shows that rubble/block stone embankment may give full play to such thermal diode effect that it may not only increase its cold storage capacity in cold season but also prevent external hot air from entering in warm season,thus it is active and effective to avoid thawing of permafrost and protect the frozen soil;rubble/block stone embankment has more significant cooling effect in a short period,however,in the long run,it is difficult to reduce the ground temperature,protect the permafrost and maintain the thermal stability when it is applied to highway subgrade in permafrost regions individually,thus it has to be reinforced. |
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