【正文】 目錄 摘 要 .......................................................................................................................... 3 Abstract ............................................................................................................................ 4 第 1 章 緒論 ................................................................................................................... 5 軟土的定義﹑類型﹑成因及工程性質(zhì) .................................................................. 5 軟土的定義 ............................................................................................... 5 軟土的類型 ............................................................................................... 5 軟土的成因 ............................................................................................... 6 軟土的工程性質(zhì) ....................................................................................... 6 軟土地基處理的意義 ......................................................................................... 7 主要軟土地基處理方法簡介 ............................................................................... 7 課題的主要研究內(nèi)容 ......................................................................................... 9 第 2 章 路基橫斷面的設(shè)計 ............................................................................................ 11 線間距 ............................................................................................................ 11 路肩寬度 ......................................................................................................... 11 路基面寬度 ..................................................................................................... 11 基床厚度和路堤厚度確定 ................................................................................ 12 邊坡坡率 ......................................................................................................... 12 填料選擇 ......................................................................................................... 12 路基橫斷面圖 .................................................................................................. 12 第 3 章 軟土地基處理 ................................................................................................... 14 CFG樁復(fù)合地基法 .......................................................................................... 14 概述 ........................................................................................................ 14 . CFG 樁設(shè)計計算 ............................................................................................. 14 確定樁長 ................................................................................................. 14 確定樁徑 ................................................................................................. 14 確定樁間距 ....................................................................................................... 14 確定天然地基承載力 ....................................................................................... 15 計算單樁承載力 .............................................................................................. 15 計算復(fù)合地基承載力標(biāo)準(zhǔn)值 ............................................................................. 15 褥墊層厚度及材料的選用 ................................................................................ 16 CFG樁施工 ..................................................................................................... 17 施工準(zhǔn)備 .................................................................................................. 17 CFG樁振動沉管灌注施工。 .................................................................. 17 不得造成樁頂設(shè)計標(biāo)高以下的樁體斷裂和擾動樁間土。 .................................... 18 袋裝砂井處理軟土地基施工方案設(shè)計 ............................................................... 19 袋裝沙井處理地基原理 .......................................................................... 19 袋裝砂井的優(yōu)點 ..................................................................................... 19 袋裝砂井的設(shè)計計算 .............................................................................. 19 袋裝砂井的施工工藝 .............................................................................. 22 施工流程： ...................................................................................................... 22 袋裝沙井與 CFG 樁處理方法的比較 ............................................................... 23 原理 ....................................................................................................... 23 墊層 ...................................................................................................... 23 時間上 ................................................................................................... 23 綜合比較 ............................................................................................... 23 第 4 章 天然地基的沉降計算 ........................................................................................ 24 設(shè)計資料 ........................................................................................................... 24 沉降理論 ........................................................................................................... 24 地基土分層 ..................................................................................................... 25 計算土的附加應(yīng)力 ........................................................................................... 25 計算各分層沉降及總沉降量 ............................................................................. 28 第 5 章 路基穩(wěn)定性檢算 ............................................................................................... 29 概述 ................................................................................................................ 29 條分法的概念 .................................................................................................. 30 條分法 .................................................................................