Abstract：Research purposes: As the Sanmenxia—Linbao section of Zhengzhou—Xi’an Passenger Dedicated Line lies in the deep collapsible loess zone，the over—settlement of bridge pile foundation occur8 due to the negative friction resistance．No computing method for pile foundation settlement in collapsible loess zone is reported up to now，80 it is necessary to do the searches on the computing method for the settlement of the bridge foundation pile in collapsible loess gone to control the total settlement in design．
Research conclusions: (1)In the settlement computation of bridge pile foundation in collapsible loess zone，the influence of negative friction resistance should be considered．(2)In design，it is reasonable that the total settlement of not more than the specified value is adopted for controlling the settlement of bridge pile foundation．(3)For the bridges in collapsible loess zone along the railway from Sanmenxia to Linbao，adopting the modified code of railway bridge to compute the total settlement of pile foundation can control the design．(4)The modulus of compressibility of soil beneath the pile bottom is the main influence factor on settlement computation，so it must be preciously measured during prospecting．
白琦成. 郑西线湿陷性黄土地区桥梁桩基沉降计算探讨[J]. 铁道工程学报, 2009, 26(6): 76-80.
BAI Qi—cheng. Exploration on the Settlement Computation of Bridge Pile Foundation in Collapsible Loess Zone on Zhengzhou—Xi’an Passenger Dedicated Line. 铁道工程学报, 2009, 26(6): 76-80.
2009, Vol. 26 
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