高填深挖小半径曲线路段路基土石方计算方法研究

发布时间：2019-02-21 09:33

【摘要】：随着我国公路建设的快速发展，特别是公路向山区延伸，虽然经过方案比选，但出于工程成本和填挖平衡考虑，设计中出现高填深挖路基段越来越普遍；同时山区部分路段地形对平面线形指标的限制，特别是山区高速公路互通匝道和普通二、三、四级公路，小半径圆曲线也时常出现。因此，山区公路出现上述两种情况的组合即高填深挖小半径曲线路段，也不足为奇。对于路基土石方数量计算，由于其数量是一个体积，常用传统计算方法—“平均断面法”和“棱台体积法”来计算；在上述山区公路中小半径曲线与高填深挖组合段路基的土石方计算时，如果采用传统计算方法存在较大误差。本文在对计算误差原因分析的前提下和对传统方法理解的基础上，根据源自工程实践的数据和案例，通过数学公式的演算和推导，提出“断面重心法”和“平面投影扇形法”两种方法来计算特定段落的土石方数量，达到消除计算误差并与实际数量相符的要求。主要做了以下研究： 1、简要说明了路基土石方数量计算的现状和传统道路土石方计算方法的一般公式，，并对土石方数量计算误差进行了分析。 2、根据实际经验给出了界定的高填深挖小半径曲线组合时的相对指标值。 3、提出断面重心法和平面投影扇形计算方法的一般公式及意义。 4、通过工程实例，将传统计算方法与断面重心法、平面投影扇形计算方法的计算结果进行比较，推荐采用与实际工程相近的计算方法，达到消除计算误差的目的。
[Abstract]:With the rapid development of highway construction in our country, especially the highway extending to the mountainous area, although the project is compared and selected, it is more and more common in the design for the consideration of engineering cost and balance of filling and digging. At the same time, the terrain of some sections of the mountain area limits the planar linear index, especially the interworking ramp of mountain expressway and the ordinary second, third and fourth grade highway, the small radius circle curve also often appears. Therefore, it is not surprising that the combination of the above two conditions of mountain highway, that is, the curve section of high fill and deep excavation with small radius, is not surprising. For the calculation of subgrade earthwork quantity, because its quantity is a volume, the traditional calculation method-" average section method "and" ridge table volume method "are used to calculate it. In the calculation of the subgrade of the combination section of the small radius curve of the mountain highway and the high fill and deep excavation section, if the traditional calculation method is adopted, there is a big error. Based on the analysis of the cause of calculation error and the understanding of traditional methods, according to the data and cases from engineering practice, the calculation and derivation of mathematical formula are given in this paper. In this paper, two methods of "section gravity center method" and "plane projection sector method" are proposed to calculate the number of earth and rock in a particular paragraph, which can eliminate the calculation error and accord with the actual quantity. The main works are as follows: 1. The present situation of the calculation of subgrade earthwork quantity and the general formula of traditional road earthwork calculation method are briefly explained, and the calculation error of earthwork quantity is analyzed. 2. According to the practical experience, the relative index value for the combination of small radius curve of high fill and deep excavation is given. 3. The general formula and significance of section gravity method and plane projection sector calculation method are put forward. 4. Through the engineering example, the calculation results of the traditional calculation method, the section gravity method and the plane projection sector calculation method are compared, and the calculation method similar to the actual project is recommended to eliminate the calculation error.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.11

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