Abstract：Research purposes: Settlement control is a key technical problem in construction of high － speed railway in collapsible loess region ． Based on the tests to the subgrade of the passenger delicate line from Zhengzhou to Xi＇an in collapsible loess region，the study was done on the settlement deformation characteristics，the collapsibility elimination effect and settlement control effect of the cement － soil compact pile foundation of the high － speed railway by conducting the observation of the settlement deformation，the large － sized submerging test and prediction of the subgrade settlement．
Research conclusions: The maximum reinforcement depth of compaction piles should not exceed 15m． The compact pile with the depth of 15m was used for the test subgrade． The surplus settlement volume of the subgrade that had been loaded by dead load for six months could meet the control requirement of the post － construction settlement for the ballastless track，and only a little settlement occurred to the reinforced layer of the foundation after submerging． And the collapsibility of the loess in the reinforced layer was eliminated fully． In the area with the thickness of the collapsible loess less than 15m，the compact pile is an effective way to reinforce the foundation for the settlement control．
屈耀辉 武小鹏 米维军 魏永梁. 黄土区高速铁路挤密桩地基沉降控制效果研究[J]. 铁道工程学报, 2011, 28(9): 31-35.
QU Yao － hui，WU Xiao － peng，MI Wei － jun，WEI Yong － liang. Study on Control Effects of Settlement of Compact Pile Foundation of High Speed Railway in Collapsible Loess Region. 铁道工程学报, 2011, 28(9): 31-35.
Gu Xiangsheng． Discussion on Some Issues in Construcyion of Subgrade of Passenger Dedicated Line ［J］． Journal of Railway Engineering Society，2005( 1) : 31 － 38．
2011, Vol. 28 
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