【正文】 技術特點 無砟軌道是一種少維護的軌道結構，它利用成型的組合材料代替道砟，將輪軌力分布并傳遞到路基基礎上。一般情況下，道床維修工作量占線路維修 工作量的 70%以上，而高速鐵路相對于普通既有線路，維修費用要增加 2 倍，道砟使用周期減少一半。目前，日本、法國、德國等發(fā)達國家的高速列車最高時速已達 300 公里 /小時以上。因此，要求軌道結構有足夠的強度和穩(wěn)定性，各組成部分的結構要合理，尺寸及材質要相互配合、等強配套、彈性連續(xù)，以保證列車按規(guī)定的速度，安全、平穩(wěn)和不間斷地運行。計算結果表明，路基上板式無砟軌道混凝土底座的配筋主要由最小裂縫寬度決定。隨著高速鐵路的發(fā)展，有砟軌道因自身的缺點而無法適應，因此需要設計合理的無砟軌道結構來滿足高速鐵路對于高速度的要求。 研究方法：采用有限元理論，建立板式無砟軌道的梁 — 板 — 板模型，應用大型有限元分析軟件 MIDAS 對模型進行求解，并對軌道板和底座進行配筋設計和校核。 關鍵詞 ：板式無砟軌道；有限元；梁板模型；配筋 2 Abstract The track is the important part which bears load directly and guide the train running, so the track should have enough strength and stability. Whit he development of highspeed railway, ballasted track cannot adapt to the development because of its own disadvantages. It is necessary to design reasonable ballastless track structure to meet the high speed requirement of highspeed railway. Research method: Use the Finite Element Analysis to establish beamslabslab model of slab ballastless track ,and solve the model with the help of large scale application softwareMIDAS, do the work of track slab and base reinforcement design and verification. Research method: Use the Finite Element Analysis to establish beamslabslab model of slab ballastless track ,and solve the model with the help of large scale application softwareMIDAS, do the work of track slab and base reinforcement design and verification. Research results: Sum up the force influence of the loading position, fastener stiffness, the width of track slab, CA mortar elastic modulus, foundation elastic coefficient and other major parameters， and seek the most unfavorable moment of track plate and base plate under vertical loads. Keywords： Slab ballastless track, Finite element, Beamslab model, Reinforcement I 目錄 1 緒論 ........................................................................................................................................ 1 無砟軌道概述 .............................................................................................................. 1 無砟軌道主要技術特點 .............................................................................................. 1 世界各國無砟軌道發(fā)展情況 ...................................................................................... 4 國內無砟軌道結構研究與工程實踐 .......................................................................... 5 板式無砟軌道的結構與類型 ...................................................................................... 7 2 我國的板式無砟軌道 .......................................................................................................... 15 我國客運專線主要無砟軌道結構型式介紹 ............................................................ 15 CRTSⅠ 型板式無砟軌道 ................................................................................. 15 CRTSⅡ 型板式無砟軌道 ................................................................................. 17 CRTSⅢ 型板式無砟軌道 ................................................................................. 19 CRTSⅠ 型雙塊式無砟軌道 ............................................................................. 19 CRTSⅡ 型雙塊式無砟軌道 ............................................................................. 21 岔區(qū)軌枕埋入式無砟軌道與岔區(qū)板式無砟軌道 .......................................... 21 板式軌道的技術要求 ................................................................................................ 22 板式無砟軌道設計 .................................................................................................... 24 板式無砟軌道結構設計原理 .................................................................................... 25 彈性地基梁理論 .............................................................................................. 25 彈性地基疊合梁理論 ...................................................................................... 26 梁－板－板彈性支承彎曲理論 ....................................................................... 28 梁－板－體彈性支承彎曲理論 ...................................................................... 28 3 板式無砟軌道的設計和計算 .............................................................................................. 29 MIDAS 介紹 ............................................................................................................... 29 模型的選擇 ................................................................................................................ 29 模型的建立 ................................................................................................................ 30 計算參數(shù) .................................................................................................................... 30 無砟軌道梁板模型的荷載工況 ................................................................................ 31 MIDAS 運行結果及分析 ........................................................................................... 31 II 4 板式無砟軌道的底座和軌道板的配筋 .............................................................................. 38 設計原則及規(guī)范 ........................................................................................................ 38 計算原則 ........................................................................................................... 38 設計規(guī)范 ........................................................................................................... 38 計算方法 ........................................................................................................... 40 軌道板的配筋及驗算 ................................................................................................ 41 軌道板縱向配筋 ............................................................................................... 41 軌道板橫向配筋 ............................................................................................... 43 混凝土底板配筋及驗算 ............................................................................................ 44 混凝土底座縱向配筋 ..............................................................