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| Research on the New Method for Accurate Linear Segmentation of Plane and Vertical Curve Type in Existing Railway |
| GUO Liang-hao 1, LIU Cheng-long 2，SONG Tao 2, LIN Yuan-hu 2 |
| 1. China Railway Siyuan Survey and Design Group Co. Ltd, Wuhan, Hubei 430063，China;2. Southwest Jiaotong University, Chengdu, Sichuan 610031，China |
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Abstract 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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Received: 10 April 2014
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2014, Vol. 31 
