公路改扩建纵断面设计研究

发布时间：2018-02-03 20:06

本文关键词： 改扩建拟合设计线形设计竖曲线　出处：《河北工业大学》2015年硕士论文　论文类型：学位论文

【摘要】：改革开放以来,我国的公路交通行业持续快速地发展,车辆持有率随之增加,部分公路难以适应不断增长的交通量需要,道路拥堵现象日趋严重,我国的公路建设必然朝着改扩建的方向发展。相对于新建公路的纵断面线形设计来说,公路改扩建纵断面线形设计更为复杂,涉及的问题较多。所以,研究改扩建公路设计中的纵断面线形设计具有十分重要的意义。基于上述背景前提,通过整理研究国内外有关公路改扩建工程的资料,确定了研究的要点。首先,本文对改扩建公路纵断面设计的内容及步骤进行了大体上的概括与总结,并列出了纵断面设计中的制约因素,以及在设计中如何考虑这些制约因素。其次,本文通过对国内外对曲线拟合方法的比较,结合我国的实际情况,提出了一种拟合纵断面的模型。该模型利用最小二乘法的原理,通过拟合出纵坡来获得纵坡参数,并通过计算得出竖曲线的参数。通过对纵坡的拟合设计实例,证明了利用最小二乘法拟合出的纵坡要优于目前所使用的改扩建纵断面纵坡的设计方法。最后总结了在纵断面设计中可能用到的几种不对称竖曲线形式,包括传统的不对称竖曲线、弧长相等的不对称竖曲线以及新型单一的不对称竖曲线(即三次抛物线竖曲线)。根据传统不对称竖曲线及弧长相等的不对称竖曲线的几何性质推导出其曲线方程(纵断面高程计算公式),并根据行车缓和冲击及视距计算出了这三种不对称竖曲线的最小长度值。通过这三种不对称竖曲线在三个工程实例中的应用情况,分析了这几种竖曲线在公路改扩建中的适用情况。在凸型竖曲线中,当需要减小的挖方量相对较多而对线形要求不太高时,可以采用传统的不对称竖曲线,弧长相等的不对称竖曲线线形比传统的不对称竖曲线较优,但纵面高程比之较高,可用于需要增加路面高度的路段。三次抛物竖曲线可用于需要降低填方的凹型曲线中,既能减小路面填方,又能提供很好的线形。总而言之,本文对改扩建公路纵断面线形设计的研究提出了一定的思路和方法,有助于纵断面线形设计的标准化实现。
[Abstract]:Since the reform and opening up, the highway traffic industry of our country continues to develop rapidly, with the increase of vehicle holding rate, some highways are difficult to adapt to the increasing demand of traffic volume, the phenomenon of road congestion is becoming more and more serious. The highway construction of our country is bound to develop towards the direction of reconstruction and extension. Compared with the design of the profile of the new highway, the design of the longitudinal section of the highway reconstruction and extension is more complex and involves many problems. It is of great significance to study the profile design of highway reconstruction and extension. Based on the above background, the data of highway reconstruction and extension project at home and abroad are analyzed and studied. The main points of the study have been determined. Firstly, the content and steps of the design of the reconstruction and extension highway vertical section are summarized and summarized, and the restricted factors in the design of the longitudinal section are listed. And how to consider these constraints in the design. Secondly, through the comparison of curve fitting methods at home and abroad, combined with the actual situation in China. In this paper, a model of pseudo-longitudinal section is put forward. By using the principle of least square method, the parameters of longitudinal slope are obtained by fitting the longitudinal slope, and the parameters of vertical curve are obtained by calculating the parameters of vertical curve. It is proved that the method of fitting longitudinal slope by least square method is better than that used at present. Finally, several kinds of asymmetrical vertical curve forms that may be used in vertical section design are summarized. Including traditional asymmetric vertical curves. Asymmetric Vertical Curve with equal Arc length and New Type of single asymmetric Vertical Curve (i.e. cubic Parabola Vertical Curve). According to the geometric properties of the traditional asymmetric vertical curve and the asymmetric vertical curve with equal arc length, the equation of the curve (vertical section height calculation formula) is derived. The minimum length of the three asymmetrical vertical curves is calculated according to the impact mitigation and the visual distance. The application of these three asymmetrical vertical curves in three engineering examples is also given. The application of these vertical curves in highway reconstruction and extension is analyzed. In convex vertical curves, the traditional asymmetric vertical curves can be used when the quantity of excavations needed to be reduced is relatively large and the requirements for alignment are not too high. The line shape of asymmetric vertical curve with equal arc length is better than that of traditional asymmetric vertical curve, but the height ratio of longitudinal plane is higher. The cubic parabolic vertical curve can be used in the concave curve which needs to reduce the filling, which can not only reduce the pavement filling, but also provide good alignment. In this paper, some ideas and methods are put forward for the study of the design of the longitudinal section of the reconstruction and extension highway, which is helpful to the standardization of the design of the profile of the longitudinal section.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U418.8;U412.33

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