摘 要

第一章 平面设计 1

1.1 可行性研究 1

1.2 沿线自然地理特征 1

1.2.1 气候特点 1

1.2.2 地形与地貌 1

1.2.3 地质与土质 1

1.2.4 水文地质 2

1.2.5 沿线筑路材料的情况 2

1.3 公路等级的确定 3

1.4 设计行车速度的确定 3

1.5选线设计 3

1.5.1选线的基本原则 3

1.5.2 选线的步骤和方法 4

1.6平曲线设计 4

1.6.1平曲线设计原则 4

1.6.2 平曲线要素值的确定 4

第二章 纵断面设计 10

2.1 纵断面设计的原则和要求 10

2.2 纵坡设计的步骤 10

2.3 竖曲线设计 10

2.3.1 确定《标准》中对竖曲线线要素值的规定 10

2.3.3 几何元素的计算 12

2.4 方案比选 13

第三章 横断面设计 15

3.1 横断面各部分尺寸的确定 15

3.2 路拱的确定 15

3.3 平曲线加宽及其过渡 15

3.4 确定最大超高率及超高过渡方式 15

3.4.1 确定最大超高率 15

3.4.2 确定超高过渡方式 15

3.4.3 超高值的计算 16

3.5排水设计 16

3.5.1排水设计的原则 17

3.5.2 排水设计的具体步骤 17

3.5.3排水设施 17

第四章 路基设计 18

4.1设计基本规定 18

4.1.1护脚、护肩、护坡的襟边宽度 18

4.1.2路基干湿类型 18

4.1.3路基最小填土高度 18

4.1.4土石方计算 18

4.2 路基横断面设计 19

4.2.1 填方路基 19

4.2.2 挖方路基 19

4.2.3 半填半挖路基 19

第五章 路面设计 20

5.1路面设计的原则 20

5.2 路面设计步骤 20

5.3 路面设计 20

第六章 路基加固（支挡）及防护工程设计 26

6.1一般规定 26

6.2坡面防护 26

6.2.1植物防护 26

6.2.2工程防护 26

6.3挡土墙设计 26

6.3.1 基础 26

6.3.2 挡土墙排水设计 26

6.3.3 沉降缝与伸缩缝 27

6.3.4 本次挡土墙设计 27

第七章 桥涵设计 34

7.1涵洞设计原则 34

7.2 涵位选择 34

7.2.1择位原则 34

7.2.2涵洞类型选择 34

7.2.3涵洞进出口的防护和加固 34

参考文献 35

结语 36

致谢 37

摘 要

本次设计路段是武汉1 8城市圈公路四十三标段，这一路段将为武汉市以及长江中游城市的发展注入强大的动力，是湖北经济发展的核心，也是中部地区崛起的重要支点。

本项目设计路段道路为双向四车道的一级公路，全长5561.963米，设计时速为80Km/h，设计包括平面设计，纵断面设计，道路路线方案比选,横断面设计，路基设计，路面结构设计，排水设计，支挡结构设计等。从线形标准角度以及经济性角度来看，最终选择路线总长度较短、各交点的线形比较协调、避开较多拆迁地方、临近村庄、土石方填挖调配较少的方案一。路基设计，因地制宜，选用合理的路基断面形式，本项目的路基断面形式包括填方路基、挖方路基以及半填半挖路基。至于路面设计，采用半刚性基层沥青路面，总厚度为93.8cm，满足规范要求的同时，由于运用当地筑路材料---石灰土稳定碎石、石灰水泥粉煤灰砂砾，因此经济上较节约。而排水设计全线根据地形采用不同尺寸的边沟、排水沟，部分路段布置了截水沟。为加固路基，护坡工程中，植草护坡与浆砌片石护坡相结合。挡土墙则采用路肩墙用以收缩坡脚以及重力式挡土墙防止山坡土体失去稳定。沿线布置了钢筋混凝土盖板涵和钢筋混凝土圆管涵。整条路线的设计，在保证线形要求的基础上，尽可能做到保护环境、安全便捷、路线美观、经济合理。

关键词：一级公路；路线；路基；路面；施工图设计

Abstract

This design is 1 8 in Wuhan city circle highway sections of 43 blocks, this section will inject strong impetus into the development of Wuhan and the middle reaches of the Yangtze river. This is not only the core of the economic development of Hubei province area but also the important strategic fulcrum of rise of central China.

The grade of the designed road is Grade 1 with bi-directional four lanes. The length of the designed road whose designed speed is 80 km per hour is 5561.963m. The design of the road includes the design of the graphic, the vertical section design, the selection of road line project, the roadbed, the cross section design, the pavement structural design, the embankment and drainage design and the retaining wall design etc. From the perspective of linear standard and economical point of view, I finally choose the project one which the line the total length is shorter, the intersection point of linear comparison and coordination, to avoid more demolition place, near the village, the deployment conditions fill dig a less solution. Roadbed design, according to local conditions, I choose reasonable subgrade section form, the subgrade section form includes the filling of roadbed, excavation roadbed and half-filled subgrade. As for pavement design, I use semi-rigid base asphalt pavement with the total thickness of 93.8 cm. It meets the specification requirements, at the same time, due to the use of local road materials - lime, lime cement fly-ash gravel soil stabilized macadam, thus saving on the economy. The drainage design is based on the different sizes of the gutter and drainage ditch, and some sections of the section are equipped with intercepting gutters. In order to strengthen the roadbed, the slope protection is combined with the slurry. The retaining wall uses the shoulder wall to shrink the slope and the gravity retaining wall to prevent the slope from losing stability. Reinforced concrete slab culvert and reinforced concrete circular pipe culvert are arranged along the line. The whole route is designed to protect the environment, safe and convenient, the route is beautiful and the economy is reasonable, on the basis of ensuring the linear requirement.

Key words: Highway of Grade 1；Road Line；Roadbed；Pavement ; Construction drawing design