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冰川冻土 ›› 2014, Vol. 36 ›› Issue (4): 870-875.doi: 10.7522/j.issn.1000-0240.2014.0104

• 冻土地区工程建设 • 上一篇    下一篇

透壁式通风管-块石复合气冷路基室内模型试验研究

刘戈1, 袁堃1,2, 李金平1, 穆柯1   

  1. 1. 中交第一公路勘察设计研究院有限公司, 陕西 西安 710075;
    2. 中国科学院 寒区旱区环境与工程研究所 冻土工程国家重点实验室, 甘肃 兰州 730000
  • 收稿日期:2014-03-17 修回日期:2014-06-23 出版日期:2014-08-25 发布日期:2014-08-23
  • 作者简介:刘戈(1979-),男,山东泰安人,高级工程师,2013年在中国科学院寒区旱区环境与工程研究所获博士学位,现主要从事公路工程研究.E-mail:416954907@qq.com
  • 基金资助:
    中交集团重大科技项目(2007-ZJKJ-07);国家重点基础研究发展计划(973计划)项目(2012CB026106);国家科技支撑计划项目(2014BAG05B03)资助

Model test study of the cooling effect of the embankment composited with ventilated duct and crushed rock

LIU Ge1, YUAN Kun1,2, LI Jinping1, MU Ke1   

  1. 1. CCCC First Highway Consultants Co., Ltd, Xi'an 710075, China;
    2. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China
  • Received:2014-03-17 Revised:2014-06-23 Online:2014-08-25 Published:2014-08-23

摘要: 为了研究透壁式通风管-块石复合气冷路基的降温效果,针对年均气温约-3.5℃,平均风速2.5 m·s-1,主导风向为西北方向的高原环境条件开展室内模型试验,分析了单一块石气冷路基和透壁式通风管-块石复合气冷路基的孔隙空气对流速度、特征点地温变化过程以及模型整体温度场变化过程.结果表明:在透壁式通风管的疏导作用下,透壁式通风管与块石层的复合结构能够起到强化路基体对流的效果,复合路基块石孔隙中的空气流速比单一块石路基提高约20%,由此导致复合路基模型底部的降温幅度是单一块石路基模型的2.2倍.模型整体温度场表明,复合路基能够起到储存冷量、降低下伏多年冻土地温的作用.

关键词: 路基工程, 降温效果, 模型试验, 透壁式通风管-块石复合气冷路基, 多年冻土

Abstract: In order to study the cooling effect of the embankment composited with ventilated duct and crushed rock, a series of model test were carried out under the conditions similar to plateau environment, i.e., the average annual temperature of -3.5℃, the average wind speed of 2.5 m·s-1 and the dominant wind direction of northwest. The air convection velocity in crushed rock, the temperature change process at feature points and the model temperature field were obtained and analyzed. It is found that an enhanced convection effect in embankment can be seen within the embankment composited with ventilated duct and crushed rock. Under the cathartic effect of the ventilated duct, the air convection velocity in the composited embankment is 20% higher than that in single crushed rock embankment, and the cooling rate at the bottom of the model of the embankment is 2.2 times of the single crushed rock embankment. The model temperature field shows that the composited embankments is able to storage cold and to cool down permafrost.

Key words: subgrade engineering, cooling effect, model test, embankment composited with ventilated duct and crushed rock, permafrost

中图分类号: 

  • U416