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【正文】 acteristics of loess embankment settlement, the reason and harm, the control measures of embankment settlement and roadbed settlement mechanism, Control of sub grade settlement after the necessity, steps and measures, and the characteristics of measures, embankment settlement calculation, monitoring of embankment settlement. KEY WORDS： sienna embankment settlement control mode settlement calculation detectio 目 錄 第 1 章 緒論 ......................................................................................................................... 1 選題背景及意義 .................................................................................................... 1 我國 鐵路 路基 現(xiàn)狀 .........................................................................................................................1 黃土 ........................................................................................................................ 1 黃土的顆粒組成會及結(jié)構(gòu) ......................................................................... 2 黃土的多孔性 ............................................................................................. 2 黃土的濕陷性與變形特性 ......................................................................... 3 黃土的結(jié)構(gòu)性問題 ..................................................................................... 4 第 2 章 路基沉降 ...............................................................................................................................................4 路基沉降 .............................................................................................................................................4 路基沉降的原因 ......................................................................................... 4 路基不均勻沉降的影響和危害 ............................................................................ 6 路基不均勻沉降對鋪軌施工的影響 .......................................................... 6 路基對稱將對高鐵運營的危害 .................................................................. 6 客運專線無砟軌道路基填筑的壓實標準 ............................................................................6 客運專線無砟軌道 路基沉降的控制要求 ............................................................................8 ． 1 沉降控制標準 ....................................................................................................................8 .2 客運專線無砟軌道路基的 填料 要求 ........................................................................8 第 3章 路基沉降的控制 及計算 ...............................................................................................................11 影響路基沉降的因素 ............................................................................................ 6 影響沉降穩(wěn)定的自然因素 ......................................................................... 11 影響沉降穩(wěn)定的人為因素 ......................................................................... 11 濕陷性黃土路基處理方法及效果評價 ................................................................ 8 試驗段工程地基處理方法 ........................................................................... 8 地基處理效果方法 ....................................................................................... 8 濕陷性黃土路基的沉降控制措施 ............................................................... 8 路基工后沉降 ...................................................................................................... 14 路基工后沉降組成分析 ............................................................................. 14 工后沉降控制的重要性與特點 ................................................................. 15 控制工后沉降的主要途徑 .................................................................................. 15 加強技術(shù)培訓及明確控制標準 ................................................................. 16 重視黃土地質(zhì)核查 ..................................................................................... 16 工后沉降的控制步驟 .......................................................................................... 16 施工前的控制措施 ..................................................................................... 16 施工過程中的控制措施 ............................................................................. 17 加強路基沉降分析與預測 ......................................................................... 17 做好路基沉降觀測 ..................................................................................... 18 地基設(shè)計 .............................................................................................................. 18 樁網(wǎng)地基設(shè)計 .................................................................................................. 19 CFG 樁樁網(wǎng)復合地基 .............................................................................. 19 灰土樁樁網(wǎng)結(jié)構(gòu) ..................................................................................... 24 樁板結(jié)構(gòu) .......................................................................................................... 26 整體構(gòu)造分析 ......................................................................................... 27 結(jié)構(gòu)幾何尺寸優(yōu)化 ................................................................................. 27 承臺板設(shè)計 ............................................................................................. 28 托梁設(shè)計 ................................................................................................. 28 樁基設(shè)計 ................................................................................................. 29 DDC 樁 ............................................................................................................... 32 適用性及沉降控制機理分析 ................................................................. 32 沉降計算模式 ......................................................................................... 33 復合地基下部土體的沉降 ..................................................................... 33 水泥土擠密樁 .................................................................................................. 35 水泥土其它影響因素及有關(guān)性能研究 .................................................. 35 水泥土擠密樁的加固原理 ...................................................................... 36 地基沉降計算 ...................................................................................................... 36