【正文】 長沙學(xué)院 畢業(yè)設(shè)計 (論文 ) II ABSTRACT The design of Hunan province Longshan to Yongshun two road sections in the preliminary design, the basin, basin surrounded by mountains surrounded by, its elevation in 400～ 600 meters between. The two stage highway begins to pile No. K4+000, end pile No. K7+ main technical indexes for highway roadbed width , a twoway dual carriageway, without the central dividing strip. The design of the speed60km/h. This design is the two highway preliminary design, first carried out the study on topographical map, in a familiar terrain map, access to the local topography and geology, hydrology and climate conditions. The initial formulation of the two route alternatives, after parison of technical indicators and the actual engineering situation, the final choice of relatively suitable scheme. In the course of graphic design, proceed with the longitudinal design, crosssectional design, roadbed design, roadbed design is plete, start a pavement design, considering the actual situation of the project, finally decided to take the road design of cement concrete pavement. In the design of roadbed and road surface is pleted, a retaining wall and drainage and protection design. The retaining wall is used in gravity retaining wall, drainage and protection design for the side ditch drainage ditches and drainage design. After conducting a culvert and the intersection of the plane of the preliminary design, the route need to construct two culverts, using pipe culvert form,Intersection using overlay corner . At the end of the project budget, project budgetary estimate, according to the actual situation, using aspect software over the budget, budget amount of 11439135 yuan. Keywords:Hunan,Longshan,Yongshun,two highway,preliminary design 長沙學(xué)院 畢業(yè)設(shè)計 (論文 ) III 目 錄 摘 要 ................................................................................................................ I ABSTRACT.......................................................................................................II 第 1章 緒 論 .................................................................................................. 1 第 2章 設(shè)計總說明 .......................................................................................... 2 地質(zhì)地貌水文狀況 ............................................................................................ 2 地形地貌 ................................................................................................ 2 氣象水文 ................................................................................................ 2 地層巖性 ................................................................................................ 2 沿線材料供應(yīng) ........................................................................................ 2 工程概況 ............................................................................................................ 3 交通量資料 ........................................................................................................ 3 設(shè)計依據(jù) ............................................................................................................ 3 第 3章 路線設(shè)計 .............................................................................................. 5 道路等級確定 .................................................................................................... 5 初始年交通量的確定 ............................................................................. 5 設(shè)計交通量的計算 ................................................................................ 6 公路等級的確定 ..................................................................................... 7 路線擬定 ............................................................................................................ 7 選線原則 ................................................................................................ 7 選線的步驟 ............................................................................................ 8 方案比選 ............................................................................................................ 8 兩方案特點(diǎn)比較 .................................................................................... 9 第 4章 線形設(shè)計 ............................................................................................. 11 平面設(shè)計 ............................................................................................................ 11 路線概念 ............................................................................................... 11 直線 ...................................................................................................... 11 圓曲線 .................................................................................................. 11 緩和曲線 ............................................................................................... 12 長沙學(xué)院 畢業(yè)設(shè)計 (論文 ) IV 平曲線要素計算 ............................................................................ 13 縱斷面設(shè)計 ...................................................................................................... 15 縱斷面設(shè)計原則 .................................................................................. 15 縱坡設(shè)計的步驟 .................................................................................. 15 最大縱坡設(shè)計要求 .............................................................................. 16 坡長限制 .............................................................................................. 16 最小縱坡、平均縱坡以及合成坡度 .................................................. 17 豎曲線半徑 .......................................................................................... 18 豎曲線幾何要素計算 .......................................................................... 18 橫斷面設(shè)計 ......................