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| Deformation Effect Caused by Gauss Projection on Track Design of High—speed Railway |
| MEI Ⅺ |
| China Railway Eryuan Engineering Group Co．Ltd，Chengdu，Sichuan 610031，China |
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Abstract Research purposes: The engineering survey plane coordinate system for high—speed railway adopts engineering independent coordinate system and the projective way is gauss projection in China．Normally，the plane coordinate system for high—speed railway is divided into some subdivisions of projection，SO that the deformation value of the projected side length is not more than 10mm／km．It is known that the angle will be indechnable after conducting the gauss projection，but it was found that the angle of the adjacent projection division would be anamorphic after conducting gauss projection in the track design of high—speed railway．So it is necessary to research the effect of this problem on the track design of high—speed railway to give the corresponding solutions and suggestions to this problem．
Research conclusions: The angle deformation will appear when gauss projection is used in coordinate projection division of the different central meridians，which has a negative impact on the tack design of high—speed railway．Especially when the rectilineal side of high—speed milway is very long，this negative impact Call not be ignored．This impact on the track design of high—speed railway should be reduced by some ways，such as optimizing the position of the subdivision of projection of engineering independent coordinate and controlling the deformation sizes of the central meridian span and angle of adjacent gauss projection divisions．And also it is necessary to research the projection model and calculation method for the engineering survey to achieve the goal that only one projection division is used in a engineering project or fewer divisions are used in one engineering project
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Received: 01 August 2010
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2010, Vol. 27 
