... Earthwork 土石方工程；土方 Easement or Transition Curve 渐曲线 East-West Expressway 东西向快速公路 ...
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然后他讨论了平面曲线的渐屈线。
在测量既有铁路曲线时，传统的测量方式是偏角法，计算曲率和拨距的方法是渐伸线法。
The traditional method to measure the curves in exiting railway is the method of deflection Angle, while the method to calculate the curvatures and the deflection distance is the involute method.
然后由模板曲线和拟合曲线段的渐缩线特征搜索出拟合曲线段在模板曲线上的对应段，由此求得相应的地层特性参数。
And the corresponding curve segments are found from asymptotic features between template curves and approximate curves. The parameters are given from this curve segments.
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