| Analysis on Ground Temperature Changes and Thermal Effects of Duct-Ventilated Embankment of the Qinghai-Tibet Railway |
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| 作者姓名： | Niu Fujun Cheng Guodong Ma Lifeng |
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| 作者单位： | State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000 |
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| 基金项目： | This work is supported in part by the grant of the Knowledge Innovation Program of the Chinese Academy of Sciences（No. KZCX3-SW-351＆No.KZCXI-SW-04）, the Chinese Natural Science Fund（ No. 40471023）,and the Special Talent Training Poject of the Chinese Natural Science Fund （No.J0130084）. |
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| 摘 要： | 1Preface TheStatekeyproject Ge’ermu LhasaSection ofQinghai TibetRailwayhasadistanceof550km runningoncontinuouspermafrostregions.Within thispart,permafrosthasthemostsignificant impactonthestabilityoftheroadbed.Thedouble effectsofglobalwarmingandtheconstructionof therailwaywillmakethepermafrostdegrade,causingthedesigningandconstructionofthe roadbedextremelydifficult1].Thenaturalthermal regimesofpermafrostandgroundiceareimportant factorsthatwillaffectthestabilityofroadbed.Theselectionofroad…
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| 关 键 词： | 青藏铁路 永久冻结带 管道通风堤防 热通量 地面温度变化 热效应 |
| 收稿时间： | 2006-04-07 |
Analysis on Ground Temperature Changes and Thermal Effects of Duct-Ventilated Embankment of the Qinghai-Tibet Railway |
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| Niu Fujun,Cheng Guodong,Ma Lifeng.Analysis on Ground Temperature Changes and Thermal Effects of Duct-Ventilated Embankment of the Qinghai-Tibet Railway[J].Engineering Sciences,2006,4(2):108-116. |
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| Authors: | Niu Fujun Cheng Guodong and Ma Lifeng |
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| Institution: | (State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000);(State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730001);(State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730002) |
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| Abstract: | Cooling principle is adopted in roadbed constructions in permafrost regions on the Qinghai-Tibet Plateau for protecting the underlying permafrost. One way is to use duct-ventilated emban kment. Based on ground temperature data collected along experimental embankments in Beiluhe section of the Qinghai-Tibet Railway, engineering effects of duct-ventilation for protection of the permafrost beneath the embankment were studied. Analyses of ground temperature changes and heat inlux indicate that ventilation ducts effectively cool the soils surrounding the ducts in the embankment and that yearly heat collection of the ambient soils appears as heat release. Permafrost behaviour beneath conventional emban kment and test embankments with ducts installed at a high and low positions were studied to determine temperature-changing tendency during three years. Where the permafrost under the conventional embankment and the duct high-positioned embankment decreasingly absorbs heat during the period. The ground temperature of the permafrost under the conventional embankment rises and that under the high-positioned embankment decreases slightly. The temperature of the permafrost under the duct low-positioned emban kment decreased remarkable due to release of heat. These findings demonstrate that ventilated embankments with low-positioned ducts produce beneficial temperaturecontrolling effects that actively cool the roadbed soils and keep the roadbed thermally stable. Accordingly, they were strongly recommended for use in the construction of emban kments in the permafrost regions on the plateau. |
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| Keywords: | Qinghai-Tibet plateau permafrost ventilation embankment ground temperature heat flux |
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