Abstract：Research purposes:The engineering property is affected due to seasonal water level fluctuations in seasonal rainfall area，how to analyse and judge the subgrade stability is very important in the surroundings. Taking railway in Nigeria as example，this paper analyzes the subgrade stability in complete weathering granite ( granite-gneiss ) stratum under the condition，in order to provide some technical reference.
Research conclusions(1)The ground water level changes greatly along the railway.(2)The complete weathering granite ( granite-gneiss ) stratum has fine physic-mechanical properties along the railway，but the bearing capacity in local area with high content of Montmorillonite or mica reduces due to ground water level rising.(3)The rising water level has little effect on the deep cutting ( within 15 m)，but in short time the height of subgrade fill is restricted to the groundwater level depth. (4)The analysis results in this paper provides some reference for railway subgrade building in the similar surroundings.
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2014, Vol. 31 
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