Abstract：Research purposes: (1)The treatment measures for the subgrade in permafrost area include passive protection，active cooling，passive protection along with active cooling，combining two kinds of active cooling，building bridge and SO on，and each measure has the different effect．In order to reasonably use the measures，the main factors that affect the engineering geological condition should be considered together and the engineering geological condition should be classified in permafrost area．(2)Based on the classification of engineering geological condition and its corresponding engineering structure，the cost was estimated for providing the scientific basis for engineering geological route selection in permafrost zone．
Research conclusions: ：(1)The engineering geological conditions in permafrost area along Qinghai—Tibet Railway are divided into four grades，namely good，general，poor and very poor．The corresponding measures for them are to adopt ordinary embankment，take a single active cooling measure，take two active cooling measures and build bridge．The safe running of train with 1 00 km／h on the Qinghai—Tibet Line in permafrost zone since open to traffic on July，2006 shows that the classification of engineering geological condition is feasible and the respective engineering structures are stable and reliable．(2)The cost of building bridge in very poor section Was 40 millions per kilometer，that was 4．4～15．4 times than the other section in the permafrost area．Therefore，railway route bypasses some very poor areas or passes it with the shortest distance．
王申平. 基于多年冻土工程地质条件分级的铁路选线原则[J]. 铁道工程学报, 2009, 26(8): 48-52.
WANG Shen—ping. Railway Route Selection Principles Based on the Classification of Engineering Geological Condition in Permafrost Regions. 铁道工程学报, 2009, 26(8): 48-52.
2009, Vol. 26 
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