The design of the original, chose three routes in the line, because the design range of steep terrain, a relatively flat line, but because the angle is too large, the turning point is too much, is not conducive to the construction and economic benefits, finally after repeated thinking, set up a suitable route.

 The total length of the highway is designed as 3807.73 meters, and it is a first class highway. The speed is 40km/h, and the average daily traffic volume is 7890, with an annual growth rate of 5.3%.

There are 5special points in the plane design, 6corners, 6 segments, and the radius is 125m, 60m, 60m, 60m,150m,300m.The easement curves are 60m, 40m, 40m, 40m, 50m, 60.The minimum line length between curves requires that the minimum length of the line between the curves is not less than120 m, and that the minimum length of the straight line between the reverse curves should not be less than80m.

 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 7m 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

1  引言··1

2  设计概况·3

2.1  设计任务··3

2.2  任务要求··3

2.3  设计资料、参数··3

2.4  自然地理条件·3

3  路线平面设计4

3.1  选线4

3.1.1  选线原则··4

3.1.2  选线成果··4

3.2  平面设计的基本要求·5

3.2.1  一般规定··5

3.2.2  直线5

3.2.3  圆曲线·5

3.2.4  缓和曲线··5

3.3  平面设计的要素计算·6

3.3.1  交点的定设6

3.3.2  缓和曲线的定设··6

3.3.3  平曲线几何要素的定设··7

3.3.4  计算实例··7

4  路线纵断面设计·9

4.1  纵断面概述·· 9

4.2  纵坡及竖曲线设计要求· 9

4.2.1  纵坡设计要·· 10

4.2.2  竖曲线设计要 10

4.3  竖曲线的计算10