【正文】 ...................................................... 6 4 平面設(shè)計(jì) ............................................................................................................................... 7 概述 ................................................................................................................................... 7 直線 ................................................................................................................................... 8 直線的特點(diǎn) .................................................................................................................... 8 直線的長(zhǎng)度限制 ............................................................................................................ 8 圓曲線 ............................................................................................................................... 8 緩和曲線 ........................................................................................................................... 9 緩和曲線的作用 ............................................................................................................ 9 緩和曲線的最小長(zhǎng)度 .................................................................................................... 9 平曲線要素計(jì)算 ............................................................................................................. 10 II 5 縱斷面設(shè)計(jì) ......................................................................................................................... 12 縱段及坡長(zhǎng)設(shè)計(jì) ............................................................................................................. 12 概述 .............................................................................................................................. 12 最大縱坡 ...................................................................................................................... 12 最小縱坡 ...................................................................................................................... 12 坡長(zhǎng)限制 ...................................................................................................................... 12 合成坡度 ...................................................................................................................... 13 道路平縱組合 ................................................................................................................. 13 平縱組合設(shè)計(jì)原則 ...................................................................................................... 13 平曲線與豎曲線的組合 .............................................................................................. 13 縱斷面設(shè)計(jì)方法及步驟 ................................................................................................. 14 豎曲線技術(shù)指標(biāo) .......................................................................................................... 14 豎曲線設(shè)計(jì)要點(diǎn)及計(jì)算 .............................................................................................. 14 縱斷面設(shè)計(jì)步驟 .......................................................................................................... 16 縱斷面圖的繪制 .......................................................................................................... 17 6 道路橫斷面及路基設(shè)計(jì) .................................................................................................... 18 道路橫斷面的組成 ......................................................................................................... 18 路幅的構(gòu)成 .................................................................................................................. 18 路幅布置類型 .............................................................................................................. 18 行車道及路拱、路肩 ..................................................................................................... 19 行車道寬度的確定 ...................................................................................................... 19 平曲線加寬及過(guò)渡 ...................................................................................................... 19 路肩 .............................................................................................................................. 19 路拱及超高 .................................................................................................................. 19 公路橫斷面設(shè)計(jì) ............................................................................................................. 21 公路橫斷面設(shè)計(jì)要求 .................................................................................................. 21 路基標(biāo)準(zhǔn)橫斷面 .......................................................................................................... 21 路基邊坡設(shè)計(jì) ................................................................................................................. 21 邊坡坡度設(shè)計(jì) .............................................................................................................. 21 邊坡穩(wěn)定性分析 .......................................................................................................... 21 路基土石方計(jì)算及調(diào)配 ................................................................................................. 23 土石方數(shù)量計(jì)算 .......................................................................................................... 23 路基土石方調(diào)配 .......................................................................................................... 23 7 公路路面結(jié)構(gòu)設(shè)計(jì) ............................................................................................................ 26 路面類型的選擇 ............................................................................................................. 26 軸載分析 ......................................................................................................................... 26 路面結(jié)構(gòu)的選擇確定 .....................................................................................................