本文關(guān)鍵詞： 軌道加固 橋涵頂進(jìn) 監(jiān)測(cè) 沉降 動(dòng)力特性　出處：《北方工業(yè)大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：隨著我國交通線路網(wǎng)的不斷完善,大量的公路與鐵路的平交路口開始出現(xiàn),為了提高交通線路運(yùn)行的效率,需要將平交路口改造成立交路口。因?yàn)樵谄礁牧⒌墓こ讨?下穿鐵路施工可以不中斷鐵路運(yùn)行,因此下穿式鐵路框架橋是較多采用的改造形式�？蚣軜虻捻斶M(jìn)施工會(huì)引起對(duì)周圍土體的擾動(dòng),使周圍地層產(chǎn)生位移和變形,軌道加固系統(tǒng)本身也會(huì)產(chǎn)生受力變形,列車能否安全通過鐵路線施工階段需要進(jìn)一步研究。針對(duì)這種情況,本文研究了框架地道橋頂進(jìn)施工對(duì)軌道加固系統(tǒng)的影響。建立了土體一軌道加固結(jié)構(gòu)的三維模型,對(duì)框架橋頂進(jìn)施工中軌道加固結(jié)構(gòu)的沉降進(jìn)行了仿真計(jì)算分析。當(dāng)開挖步距分別取0.75m、1.50m、2.25m、3.00m時(shí),模擬框架橋的頂進(jìn)施工過程,計(jì)算得出每步開挖后的鋼軌和工字鋼縱梁的沉降值,從而計(jì)算出在不同開挖步距下軌道加固系統(tǒng)的最大沉降值,并得到線路和軌道加固系統(tǒng)的沉降規(guī)律。對(duì)工程頂進(jìn)過程進(jìn)行沉降監(jiān)測(cè);根據(jù)實(shí)際工程中監(jiān)測(cè)的數(shù)據(jù),總結(jié)軌道結(jié)構(gòu)沉降的規(guī)律,將監(jiān)測(cè)數(shù)據(jù)與計(jì)算出的數(shù)據(jù)進(jìn)行對(duì)比,監(jiān)測(cè)的軌道沉降值與計(jì)算得出的軌道沉降值基本吻合,驗(yàn)證了計(jì)算結(jié)果的可靠性;從監(jiān)測(cè)數(shù)據(jù)還可得出,縱梁的沉降值呈增加趨勢(shì),但滿足規(guī)范要求;開挖步段出現(xiàn)了沉降波動(dòng),說明了預(yù)制箱型框架和軌道的不平整性開始顯現(xiàn)出來。根據(jù)列車的實(shí)際軸重和輪間距,將列車簡(jiǎn)化為簧上質(zhì)量;將鋼軌模擬成梁?jiǎn)卧?建立了符合工程實(shí)際的輪軌動(dòng)力作用計(jì)算模型,分析結(jié)構(gòu)體系在輪軌垂向荷載下的影響。通過對(duì)比不同頂進(jìn)階段的工字鋼縱梁的振動(dòng)位移和加速度,得出線路動(dòng)力響應(yīng)規(guī)律,隨著框架橋頂進(jìn)的深入,縱梁垂向位移幅值增大,加速度幅值減小。
[Abstract]:With the continuous improvement of China's traffic line network, a large number of highway and railway intersections have begun to appear. In order to improve the efficiency of traffic line operation, it is necessary to transform the horizontal intersection into an interchange, because in the project of leveling and setting up, The construction of the underpass railway can not interrupt the railway operation, so the frame bridge of the underpass railway is more commonly used. The jacking construction of the frame bridge will cause disturbance to the surrounding soil and cause the displacement and deformation of the surrounding strata. The track reinforcement system itself will also produce mechanical deformation, whether the train can safely pass through the railway line construction phase needs further study. In view of this situation, In this paper, the influence of the jacking construction of the frame tunnel bridge on the track strengthening system is studied, and the three-dimensional model of the soil-track strengthening structure is established. The settlement of track-strengthened structure during the jacking construction of frame bridge is simulated and analyzed. When the excavation step distance is 0.75mGW 1.50mt2.25mc3.00m respectively, the jacking construction process of the frame bridge is simulated, and the settlement values of the steel rail and I-beam after each step excavation are calculated. Thus the maximum settlement value of the track reinforcement system under different excavation steps is calculated, and the settlement law of the track and track reinforcement system is obtained. The settlement monitoring of the advance process of the project is carried out, and according to the monitoring data in the actual project, the settlement of the track reinforcement system is obtained. Summing up the rule of track structure settlement, comparing the monitoring data with the calculated data, the measured track settlement value basically coincides with the calculated track settlement value, which verifies the reliability of the calculated results. The settlement value of the longitudinal beam increases, but meets the requirements of the code. The settlement fluctuation in the excavation step shows that the unevenness of the precast box frame and track is beginning to appear. According to the actual axle load and wheel spacing of the train, The train is simplified to spring mass, the rail is simulated as a beam element, and the calculation model of wheel / rail dynamic action in accordance with engineering practice is established. By comparing the vibration displacement and acceleration of I-beam in different jacking stages, the dynamic response law of the line is obtained. The vertical displacement amplitude of the longitudinal beam increases with the advance of the roof of the frame bridge. The acceleration amplitude decreases.
【學(xué)位授予單位】：北方工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U213.2;U445

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