研究目的:铁路既有线复测实测线形的分段是复测计算的首要步骤，其线形分段的结果将影响后续的线形拟合以及优化。针对传统铁路既有线的线形分段过程中存在的分段精度不高等问题，提出-种线形分段新方法，即首先进行线形的概略分段，找到分段点的概略位置，然后通过拟合迭代的方法进行精确分段。
研究结论:(1)基于相邻弦方位角变化的平面实测线形概略分段原理，能够对多种不同圆曲线半径的实测数据进行概略分段，分段结果满足拟合迭代的要求;(z)基于平面线形精确分段方法，对比实测数据与设计信息的分段结果，验证这种精确分段方法具有较高的分段精度;(3)基于概略分段、拟合、迭代的纵断面实测线形精确分段原理，对比实测数据与设计信息的分段结果，验证了这种纵断面线形分段的可行性及其高精度。(4)研究结果可应用于既有铁路复测计算，对铁路既有线的整正具有实际的参考意义。
Research purposes ： The measured linear segmentation in existing railway，which would affect linear fitting and optimization, is the first step of retest calculation. Considering the shortage of low segmentation accuracy in existing retest segmentation process，we propose a new method for linear segmentation ： first find the approximate location of pile point by using the method of approximate segmentation, then carry on accurate segmentation by fitting and iterating calculation.
Research conclusions :(1) Based on adjacent chord azimuth changes，the method of approximate segmentation can handle different curve radius measured data, and the result meets the requirement of fitting and iterating calculation.(2)By contrast of the segmentation results between measured data and design data，the method of plane accurate segmentation can achieve high segmentation accuracy.(3)By contrast of the segmentation results between measured data and design data, the method of vertical linear accurate segmentation is correct and the high accuracy can be achieved. (4) The research achievement can be applied in measured linear calculation，and has the reference value for linear adjustment in existing railway.
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