The total length of the highway is designed as 3532.642 meters, and it is a second class highway. The speed is 60km/h, and the average daily traffic volume is 8068, with an annual growth rate of 5.3%.

There are 8 special points in the plane design, 6 corners, 6 segments, and the radius is m, R1=250m,R2=250m,R3=315.543m，R4=400m,R5=683.755m，R6=260m . The       easement urves areLs1=109.4m,Ls2=70m,Ls3=90.931m,Ls4=104.159m,Ls5=90.742m,Ls6=80m.The minimum line length between curves requires that the minimum length of the line between the curves is not less than 360m, and that the minimum length of the straight line between the reverse curves should not be less than 120m.

 The "vertical flat pack" principle in the design of vertical curve, the consideration of three aspects of vertical and horizontal gradients test line, determining the grade value, to determine the radius of vertical curve, then calculate the design elevation, complete profile.

 In the cross sectional design stage, the layout of the roadway, the central partition, the sidewalk and the shoulder are determined according to the traffic volume, the speed of driving and the topography. The lateral geometric dimensions are determined. On the basis of standard cross section, the cross section of each pile is widened and ultra high, so as to improve the comfort and safety of driving.

 Earthwork allocation is pided into horizontal allocation and vertical deployment. And calculates the debit, the discard, and the total volume. Through the allocation of earth and stone to solve the design of road balance of earthwork and utilization, in the national policy and technical and economic conditions, as far as possible to dig dug for filling, to avoid unnecessary debit and dump.

 Subgrade design focuses on the design of the subgrade and the method of arc to calculate the stability of the soil. Retaining walls are constructed to prevent soil collapse and are mainly subjected to lateral earth pressure. It is widely used in the support of embankments, cutting slopes, tunnel openings, bridge ends and so on. Retaining wall design and drainage facilities layout, retaining walls using 8m gravity retaining wall. Gravity retaining wall is simple in structure and easy to construct, so gravity retaining wall is adopted.

Key words: road design; subgrade and pavement design;

目 录

设计总说明 2

引 言 8

1 绪论 8

1.1 设计任务 8

1.2 任务要求 8

1.3 设计意义 9

1.4 交通量 9

1.5 公路技术标准 9

2 线形确定 10

2.1 道路等级确定 10

2.1.1 公路等级的划分 10

2.1.2 已经设计资料 10

2.1.3 查规范 10

2.1.4 确定公路等级 11

2.2 选线 11

2.2.1 选线的意义 11

2.2.2 平原微丘地区公路路线特点 11

2.2.3 平原微丘地区选线要点 11

3 平面设计 11

3.1 平面设计的要求 11

3.2 参数确定，查《公路工程技术标准》 12

3.2.1 公路服务水平 12

3.2.2 圆曲线最小半径 12

3.2.3 缓和曲线最小长度 12

3.3平面线形设计 12

3.3.1 方位角、转角计算 12

3.3.2 平曲线要素,各特征点桩号计算 14

3.3.3 定桩 19

3.3.4 坐标计算 19

3.4设计成果 22

3.4.1直线、曲线及转角表 22

3.4.2 逐桩坐标表 22

3.4.3 路线平面图 22

4 纵断面设计 23

4.1 概述 23

4.2 纵坡与坡长设计 23

4.2.1 纵坡设计的有关规范和要求 23

4.2.2 坡长设计的有关规范和要求 23

4.3 竖曲线设计 23

4.3.1 纵断面设计的方法与步骤 23

4.3.2 竖曲线 24

4.3.3 竖曲线计算 24

4.3.4设计成果 29

5 横断面设计 30

5.1 概述 30

5.2 横断面组成及要素确定 30

5.2.1 横断面组成 30

5.2.2 横断面要素确定 30

5.3 横断面设计步骤 31

5.4 加宽设计 31

5.5 超高设计 31