设计总说明书

临安线地处北亚热带湿润区，受季风环流影响，形成的气候特点是：四季分明，气候温和，雨水充沛，日照充足，无霜期长。气温，1月平均气温在2.8℃左右；7月平均气温在28℃左右。全年无霜期220天左右。无锡市区年平均降水量在1048毫米。雨季较长，主要集中在夏季。全年降水量大于蒸发量，属湿润地区。无锡市区日照时数2019.4小时。常见的气象灾害有台风、暴风、连阴雨、干旱、寒潮、冰雹和大风等。

路段所处地势平坦，设计段起点A的桩号为K0+000。据钻探鉴别、现场静力触探试验、标准贯入试验结果及室内土工试验成果等资料分析，获得设计路段土层的基本分布情况为：表土层（1－2m），灰-灰黄色粉质粘土（2－3m），灰-青灰色淤泥质粉质粘土（4m以下），再往下是灰色泥岩。

设计的最初,在定线时选择了三条路线，由于沿线较多学校、公司工厂及及居民区，避开学校，尽可能不经过公司，最终经反复思考，定出了较合适的路线。

公路总长设计为6871.693米，设为二级公路，速度为80km/h，年均日交通量预测为7890辆，年增长率5.3%。

平面设计中设有6个特殊点，4个转角，4段圆曲线段，半径为1900m，1500m，600m，1000m。缓和曲线为130m,250m，250m，130m。曲线间直线最小长度的要求同向曲线间的直线最小长度以不小于480 km，反向曲线之间的直线段最小长度不可小于160 km。

在竖曲线设计阶段采用“平包竖”原则，各方面考虑平、纵、横三个方面试定坡度线，确定纵坡值，确定竖曲线半径，接下去计算设计标高，完成纵断面图。

在横断面设计阶段，根据交通量，行车速度、结合地形来确定道路行车道、路肩等的布置，确定其横向几何尺寸。在标准横断面的基础上对各桩的横断面进行超高设计，以提高驾车的舒适和安全。

土石方调配，分横向调配和纵向调配。并计算借方，弃方和总运量。通过土石方调配来解决设计道路的土石方数量的平衡与利用，在国家政策和技术经济的条件下，尽可能移挖作填，避免不必要的借方和弃土。

路基设计重点考虑路基的设计和利用圆弧法来计算土体稳定性。修筑挡土墙是为了阻止土体坍滑，主要受侧向土压力。用于路堤的支撑，路堑边坡、隧道洞口、桥梁两端等等。挡土墙的设计和排水设施布置，挡土墙采用重力式挡土墙。重力式挡土墙结构简单，施工简便，故采用重力式挡土墙。

关键词：道路设计;路基路面设计；

The total design specification

The Linan line is located in the humid region of the northern subtropical zone and is influenced by the monsoon circulation. The climatic characteristics are as follows: distinct seasons, mild climate, abundant Rain Water, abundant sunshine and long frost-free period. The average temperature in January was about 2.8 ℃, and that in July was about 28 ℃. The annual frost-free period is about 220 days. The average annual precipitation in Wuxi is 1048 mm. The rainy season is long, mainly concentrated in summer. The annual precipitation is larger than evaporation, which is a humid area. Wuxi City sunshine hours of 2019.4 hours. Common meteorological disasters include typhoon, storm, continuous rain, drought, cold wave, hail and gale.

The terrain of the section is flat and the pile number of the starting point A of the design section is K0000. According to the data of drilling identification, field static penetration test, standard penetration test and indoor geotechnical test, The basic distribution of the soil layer in the designed section is as follows: topsoil layer 1-2mg, gray-yellow silty clay 2-3mg, gray-grey-silty clay less than 4m, and then grey mudstone.

At the beginning of the design, three routes were chosen when setting the line. Because more schools, factories and residential areas were chosen along the route, avoiding schools and not going through the company as far as possible, a more suitable route was finally determined after repeated thinking.