【正文】 技術(shù)特點(diǎn) 無(wú)砟軌道是一種少維護(hù)的軌道結(jié)構(gòu)，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(chǔ)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(duì)于普通既有線路，維修費(fèi)用要增加 2 倍，道砟使用周期減少一半。目前，日本、法國(guó)、德國(guó)等發(fā)達(dá)國(guó)家的高速列車(chē)最高時(shí)速已達(dá) 300 公里 /小時(shí)以上。因此，要求軌道結(jié)構(gòu)有足夠的強(qiáng)度和穩(wěn)定性，各組成部分的結(jié)構(gòu)要合理，尺寸及材質(zhì)要相互配合、等強(qiáng)配套、彈性連續(xù)，以保證列車(chē)按規(guī)定的速度，安全、平穩(wěn)和不間斷地運(yùn)行。計(jì)算結(jié)果表明，路基上板式無(wú)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(diǎn)而無(wú)法適應(yīng)，因此需要設(shè)計(jì)合理的無(wú)砟軌道結(jié)構(gòu)來(lái)滿足高速鐵路對(duì)于高速度的要求。 研究方法：采用有限元理論，建立板式無(wú)砟軌道的梁 — 板 — 板模型，應(yīng)用大型有限元分析軟件 MIDAS 對(duì)模型進(jìn)行求解，并對(duì)軌道板和底座進(jìn)行配筋設(shè)計(jì)和校核。 關(guān)鍵詞 ：板式無(wú)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(wú)砟軌道概述 .............................................................................................................. 1 無(wú)砟軌道主要技術(shù)特點(diǎn) .............................................................................................. 1 世界各國(guó)無(wú)砟軌道發(fā)展情況 ...................................................................................... 4 國(guó)內(nèi)無(wú)砟軌道結(jié)構(gòu)研究與工程實(shí)踐 .......................................................................... 5 板式無(wú)砟軌道的結(jié)構(gòu)與類(lèi)型 ...................................................................................... 7 2 我國(guó)的板式無(wú)砟軌道 .......................................................................................................... 15 我國(guó)客運(yùn)專(zhuān)線主要無(wú)砟軌道結(jié)構(gòu)型式介紹 ............................................................ 15 CRTSⅠ 型板式無(wú)砟軌道 ................................................................................. 15 CRTSⅡ 型板式無(wú)砟軌道 ................................................................................. 17 CRTSⅢ 型板式無(wú)砟軌道 ................................................................................. 19 CRTSⅠ 型雙塊式無(wú)砟軌道 ............................................................................. 19 CRTSⅡ 型雙塊式無(wú)砟軌道 ............................................................................. 21 岔區(qū)軌枕埋入式無(wú)砟軌道與岔區(qū)板式無(wú)砟軌道 .......................................... 21 板式軌道的技術(shù)要求 ................................................................................................ 22 板式無(wú)砟軌道設(shè)計(jì) .................................................................................................... 24 板式無(wú)砟軌道結(jié)構(gòu)設(shè)計(jì)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(wú)砟軌道的設(shè)計(jì)和計(jì)算 .............................................................................................. 29 MIDAS 介紹 ............................................................................................................... 29 模型的選擇 ................................................................................................................ 29 模型的建立 ................................................................................................................ 30 計(jì)算參數(shù) .................................................................................................................... 30 無(wú)砟軌道梁板模型的荷載工況 ................................................................................ 31 MIDAS 運(yùn)行結(jié)果及分析 ........................................................................................... 31 II 4 板式無(wú)砟軌道的底座和軌道板的配筋 .............................................................................. 38 設(shè)計(jì)原則及規(guī)范 ........................................................................................................ 38 計(jì)算原則 ........................................................................................................... 38 設(shè)計(jì)規(guī)范 ........................................................................................................... 38 計(jì)算方法 ........................................................................................................... 40 軌道板的配筋及驗(yàn)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(yàn)算 ............................................................................................ 44 混凝土底座縱向配筋 ..............................................................