【正文】 鐵路黃土路基沉降分析及控制 學(xué)生姓名 學(xué)號 班級 專業(yè) 一、 課題研究背景及國內(nèi)外研究現(xiàn)狀 我國人口眾多，隨著中國經(jīng)濟的迅猛發(fā)展，城市化進程加快，我國鐵路呈現(xiàn)客流量大 、集中、行程長的特點。自 20 世紀(jì) 60年代第一 條 高速鐵路在日本建成以來。除了強度要求外，還有變形條件要求。目前國內(nèi)外對黃 土地基的處理主要有 墊層法、強夯法、水泥攪拌樁、孔內(nèi)深層強夯擠密法、淺層阻水方案和深層散水方案、沖擊壓實技術(shù) 、 灰土樁擠密法 等。 并分析了各種措施的處理效果； 影響路基沉 降的因素分為人為因素和自然因素；控制路基工后沉降的主要途徑、步驟和措施。 。 四、進度計劃 第 14 周 開題報告。路基變形最明顯、危害最大的問題是路基沉降。 關(guān)鍵字： 黃土 路基工后沉降 控制方式 沉降計算 監(jiān)測 Abstract Highspeed railway represents the railway modernization development trend in the 21st century, is the important achievement of transportation, is the mon wealth of mankind. Along with the rapid development of economy, the transportation demand, China railway PDL surge has entered a rapid development construction period， Due to the high speed railway running speed, the technical standard of roadbed, strict control of subgrade settlement of deformation and has bee the biggest characteristic of PDL roadbed. The most obvious harm, roadbed deformation of the biggest problems is the embankment settlement. Embankment settlement control is one which involves many factors, has large uncertainties of engineering problems. Embankment settlement including sub grade construction settlement and postconstruction settlement, postconstruction settlement risk, particularly serious harm,This paper from the nature and characteristics 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(biāo)準(zhǔn) ............................................................................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(biāo)準(zhǔn) ....................................................................................................................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(xùn)及明確控制標(biāo)準(zhǔn) ................................................................. 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(yù)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