Research on the State of Subgrade Engineering in Permafrost Region Railway during the Early Operation
SHI Gang － qiang1，LI Yong － qiang2
1． Lanzhou University，Lanzhou，Gansu 730000，China; 2． Northwest Research Institute Co． Ltd of China Railway Engineering Corporation，Lanzhou，Gansu 730000，China
Abstract：Research purposes: Studies on the status of subgrade engineering in permafrost region is complicated by the intervention of temperature and water and railway operating conditions． Based on in － site investigation and monitoring during the early operation of the QTR，this paper studied the status of subgrade engineering from three aspects，subgrade deformation，geothermal changes and hydrothermal conditions，and proposed solutions to subgrade cracks to ensure railway safety and conservation．
Research conclusions: ( 1) During the Early Operation，the subgrade engineering in Permafrost Region Railway，we found that the overall deformation has been on the decline and subgrade deformation has stabilized． ( 2) The upper limits of permafrost in most subgrade sections have increased，their statuses have stabilized and the cold reserves of bases have increased． The increase in upper limits is a result of the decrease in soil temperature． ( 3 ) The status of subgrade engineering has changed because the changes in geothermal field have altered the places and soil depths of deformations． At the same time，the asymmetry field causes deformation differences and deduces cracks． Hydrothermal changes will result in cracks． ( 4) Asymmetry thermotics in subgrade structure will soften the asymmetry of upper limits，thus reduce the difference of horizontal deformations and prevent cracks．
石刚强1李永强2. 多年冻土区铁路运营初期路基工程状态研究[J]. 铁道工程学报, 2012, 29(5): 14-17.
SHI Gang － qiang1，LI Yong － qiang2. Research on the State of Subgrade Engineering in Permafrost Region Railway during the Early Operation. 铁道工程学报, 2012, 29(5): 14-17.
Zhang Luxin， Yuan Sicheng， Yang Yongping． Mechanism and Prevention of Deformation Cracks of Embankments in the Permafrost Region along Qinghai － Tibet Railway ［J］． Quaternary Sciences，2003 ( 6 ) : 604 － 610．
Wang Yingsheng，Li Yongqiang． An Analysis of the Causes of Crack Formation in the Thermal Probe Test Subgrade of the Qinghai － Tibet Railway［J］． Journal of Gansu Sciences，2003( 4) : 79 － 82．
Jiang Fuqiang， Yang Yongpeng， Yang Yinhai， etc． Discussion on Theoretical Analysis and Calculation of Subgrade Settlement and Cracking in Permafrost of the Plateau［J］． Journal of Railway Engineering Society， 2003( S) : 5 － 8．
Su Yi，Xu Zhaoyi，Wang Lianjun． The Influence of Different Roadbed Engineering Construction on the Roadbed Crack of Qinghai － Tibet Railway［J］． Journal of Engineering Geology，2004( 3) : 292 － 297．
La Youyu，Zhang Luxin． Permafrost Engineering Problem along the Qinghai － Tibet Railway: A Thorough Research and Practice［J］． Journal of Glaciology and Geocryology，2005( 1) : 46 － 49．
Wang Xiaojun， Han Wenfeng， Jiang Fuqiang． Dissecionn and Analysis of Settlement of Rubble Ventilation Embankment and Crack of Ordinary Embankment in Permafrost Regions ［J］． Chinese Journal of Rock Mechanics and Engineering，2006( 9) : 1904 － 1911．
LI Yongqiang． An Analysis of the Causes of Cracks in the Thermal Probe Subgrade of the Qinghai － Tibet Railway［J］． Journal of Lanzhou University ( Version of Sciences) ，2006( Special) : 100 － 103．
Man Gaofeng， Liu Jiankun． Numerical Analysis on Mechanism of Longitudinal Crack Occurred in Subgrade in Permafrost Region ［ J ］． Railway Engineering，2007( 5) : 51 － 54．
Li Jincheng． Frost Damages in Permafrost Regions along the Qinghai － Tibet Railway in 2001 － 2006: Investigation and Analysis［J］． Journal of Giaciology and Geocryology，2008( 2) : 147 － 152．
2012, Vol. 29 
版权所有 © 2014 《铁道工程学报》编辑部