Abstract：Research purposes: High speed railway needs a very strict control of post － construction subgrade settlement．The post － construction subgrade settlemen mainly refers to the residual subgrade settlement after the track is laid． The design speed of the Shijiazhuang － Wuhan high － speed Railway is 350 km / h with the ballastless track． During the construction，the monitoring and research were done on the subgrade settlement in the tested section in order to research the scientificness of reinforcing subgrade．
Research conclusions:The pile + plate structure and CFG pile composite foundation was used for reinforcing the deep soft soil foundation along with the heap pre － loading． The settlement volume during construction was up to the 72% － 85% of the total settlement volume，so the post － construction settlement was effectively controlled． The vertical settlement of the foundation in the whole section was even and it met the demand of laying the ballstless track and proved the reinforcement measures were feasible．
赵 勇陈 占 徐红星. 高速铁路无砟轨道路基沉降监测和研究[J]. 铁道工程学报, 2012, 29(6): 45-49.
ZHAO Yong，CHEN Zhan，XU Hong － xing. Monitoring and Research on Subgrade Settlement of Ballastless Track of High －speed Railway. 铁道工程学报, 2012, 29(6): 45-49.
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2012, Vol. 29 
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