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在进行老路改扩建过程中,常因道路修建较早或者有些路段已经经过多次改建扩建,原有设计文件往往不易得到或已与实际情况不符。现阶段研究表明:对老路的纵断面线形进行测量并拟合分析测量数据能有效地获取老路竖曲线参数。目前在中国,一般采用人工拉线法,由于操作起来主观性较强,不但费工时,还不能有效地控制误差。笔者介绍一个模型,二次开发Matlab提供的工具箱,半自动地拟合老路纵断面线形,目标函数为每个测量点与拟合曲线的绝对误差总和最小。最后通过实例验证,获得了理想的结果。
During the process of renovation and expansion of the old road, the original design documents are often not easily obtained or have been inconsistent with the actual situation because the roads are built earlier or some sections have been rebuilt and expanded several times. At this stage, the research shows that the vertical curve parameters of the old road can be obtained effectively by measuring the profile of the old road and fitting the measured data. Currently in China, the general use of artificial drawing method, due to the operation of a more subjective, not only time-consuming, but also can not effectively control the error. I introduce a model, the second development of the toolbox provided by Matlab, semi-automatically fit the old road profile line, the objective function for each measurement point and the sum of the absolute error of the curve is minimal. Finally, through the example verification, the ideal result is obtained.