Permafrost Characteristics of the Qinghai-Tibet Plateau and Methods of Roadbed Construction of Railway |
| |
| Authors: | NIU Fujun XU Jian LIN Zhanju WU Qingbai CHENG Guodong |
| |
| Institution: | [1]State Key Laboratory of Frozen Soil Engineering, Cold andArid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China; [2]Cold Regions Road Engineering Laboratory, the First Highway Design and Research Institute, Xi＇an 710068, China |
| |
| Abstract: | Permafrost along the Qinghai-Tibet railway is featured by abundant ground ice and high ground temperature.Under the influence of climate warming and engineering activities,the permafrost is under degradation process.The main difficulty in railway roadbed construction is how to prevent thawing settlement caused by degradation of permafrost.Therefore the proactively cooling methods based on controlling solar radiation,heat conductivity and heat convection were adopted instead of the traditional passive methods,which is simply increasing thermal resistance.The cooling methods used in the Qinghai-Tibet railway construction include sunshine-shielding roadbeds,crushed rock based roadbeds,roadbeds with rock revetments,duct-ventilated roadbeds,thermosyphon installed roadbeds and land bridges.The field monitored data show that the cooling methods are effective in protecting the underlying permafrost,the permafrost table was uplifted under the embankments and therefore the roadbed stability was guaranteed. |
| |
| Keywords: | permafrost roadbed cooling method Qinghai-Tibet railway |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
| 点击此处可从《Acta Geologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Geologica Sinica》下载免费的PDF全文 |
|
