公路总长设计为3532.642米,设为二级公路,速度为60km/h,年均日交通量预测为8068辆,年增长率5.3%。
设计总说明书:新淳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,由于设计范围的地势较陡,选择了较为平坦的路线,但由于转角度数过大,转折点过多,不利于施工和经济效益,最终经反复思考,定出了较合适的路线。
公路总长设计为3532.642米,设为二级公路,速度为60km/h,年均日交通量预测为8068辆,年增长率5.3%。
平面设计中设有8个特殊点,6个转角,6段圆曲线段,半径分为R1=250m,R2=250m,R3=315.543m,R4=400m,R5=683.755m,R6=260m。缓和曲线分别为Ls1=109.4m,Ls2=70m,Ls3=90.931m,Ls4=104.159m,Ls5=90.742m,Ls6=80m。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360m,反向曲线之间的直线段最小长度不可小于120m。
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、中央分隔带、人行道和路肩等的布置,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加宽和超高设计,以提高驾车的舒适性和安全性。
土石方调配,分为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8m的重力式挡土墙。重力式挡土墙结构简单,施工简便,故采用重力式挡土墙。
The total design specification
Xin Chun line road is located in the subtropical monsoon climate, four seasons, abundant rainfall. Annual average temperature:28℃; Annual average precipitation:1048mm. The rainy season is longer, mainly in the summer. The annual precipitation is greater than the evaporation volume, which belongs to the humid area. The number of sunshine in the city of Wuxi is 2019.4 hours. Common meteorological disasters are typhoons, storms, continuous rain, drought, cold waves, hail and gale.
The topography of the section is small and the geological condition is good. The number of A at the beginning of the design is K0+000. According to the analysis of drilling site identification, static cone penetration test, standard penetration test and laboratory soil test data, obtained the basic distribution of road soil for soil layer (1 - 2m), gray clay (2 - 3M), gray clay (4m), and then down the grey mudstone. The gray white clay and black clay layer weathered gray clay rock slope.
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.