本文選題：地鐵盾構隧道 + 有砟鐵路��； 參考：《福建工程學院》2017年碩士論文

【摘要】：隨著城市地鐵隧道和高速鐵路建設規(guī)模的不斷擴大,地鐵隧道下穿既有鐵路線路的工程也日益普遍。新建隧道的施工必然會引起既有鐵路路基和軌道產生沉降變形,影響列車的安全運行。因此,研究地鐵隧道下穿既有鐵路引起的沉降變形規(guī)律和隧道-路基-軌道三者之間的相互作用機理,科學的制定隧道建設過程中相應的軌道沉降控制辦法就顯得十分必要。首先,第一階段對地表沉降進行預測,為了得到更加準確的沉降結果,本文采用了Peck經驗公式與Verruijt復變函數相結合預測地表沉降的理論研究辦法,并考慮了不同施工參數對地表沉降的影響。同時,采用數值計算的方法,對理論預測進行驗證。其次,第二階段對軌道沉降進行預測,基于連續(xù)彈性點支承梁模型的路基不均勻沉降引起軌道沉降的計算方法,將地表沉降作為軌道沉降的非線性邊界條件,對軌道沉降進行預測。并同樣考慮了相應施工參數對軌道沉降的影響。然后,基于軌道高低平順性,提出了針對不同施工參數的軌道沉降控制標準,并制定了相應的沉降控制措施。最后,將兩階段分析法應用于福州地鐵1號線羅漢山站~福州火車站站盾構下穿有砟鐵路軌道段,與監(jiān)測數據進行對比分析,驗證了本文軌道沉降研究方法的可靠性。并得到了如下主要結論:(1)在施工參數改變的情況下,Peck公式擬合Verruijt復變函數得到的地表沉降曲線相關系數均在0.98以上,證明此理論辦法預測地表沉降具有較高的適應性。且該預測方法可將土體彈性模量E和泊松比μ考慮在內,較傳統(tǒng)Peck公式通過經驗給定的沉降槽寬度系數i,預測的地表沉降具有更高的可靠性。(2)盾構隧道施工引起的地表沉降主要發(fā)生在盾構開挖掌子面鄰近前、盾構通過期間及盾尾通過后三個階段。地層損失率和土體泊松比對地表沉降量的影響較大,對沉降槽寬度影響較小;隧道埋深對地表沉降量和沉降槽寬度的影響均較大。(3)通過將地表的不均勻沉降作為軌道沉降的非線性邊界條件,推導出了下穿有砟鐵路盾構隧道施工引起的軌道沉降解析解。得到相關施工參數對軌道沉降影響,與其對路基沉降影響的規(guī)律類似,并對鋼軌剛度和道砟剛度的取值提供了相關參考建議。(4)將本文的兩階段分析法,應用于福州地鐵1號線相關工程,得到的預測與現(xiàn)場監(jiān)測的軌道沉降幅值,誤差在8%以內。驗證了采用本文理論辦法預測福州地鐵軟土地層軌道沉降的適應性和正確性。
[Abstract]:With the expansion of urban subway tunnel and high-speed railway construction, the project of subway tunnel passing through the existing railway line is becoming more and more common. The construction of the new tunnel will inevitably cause the settlement and deformation of the existing railway subgrade and track, which will affect the safe operation of the train. Therefore, it is necessary to study the law of settlement and deformation caused by the existing railway under the subway tunnel and the interaction mechanism between the tunnel subgrade and track, and to scientifically formulate the corresponding control method of track settlement in the course of tunnel construction. Firstly, in the first stage, the surface subsidence is predicted. In order to obtain more accurate settlement results, the Peck empirical formula and the Verruijt complex variable function are used to predict the surface subsidence. The influence of different construction parameters on surface subsidence is considered. At the same time, the method of numerical calculation is used to verify the theoretical prediction. Secondly, in the second stage, the track settlement is predicted. Based on the calculation method of uneven settlement of roadbed caused by uneven settlement of roadbed based on continuous elastic point support beam model, the surface settlement is regarded as the nonlinear boundary condition of track settlement. The settlement of the track is predicted. The influence of the corresponding construction parameters on the track settlement is also considered. Then, based on the high and low ride comfort of track, the control standard of track settlement for different construction parameters is put forward, and the corresponding settlement control measures are established. Finally, the two-stage analysis method is applied to the railway track section of the ballasted railway under shield tunneling in Luohanshan Station ~ Fuzhou Railway Station of Fuzhou Metro Line No. 1, and compared with the monitoring data, the reliability of the research method of track settlement in this paper is verified. The main conclusions are as follows: (1) the correlation coefficient of surface subsidence curve obtained by fitting Verruijt complex variable function with Peck formula is above 0.98, which proves that this theoretical method has high adaptability to predict surface subsidence. The elastic modulus E and Poisson's ratio 渭 can be taken into account in this method. Compared with the traditional Peck formula, the predicted surface settlement is more reliable than that of the traditional Peck formula. (2) the surface settlement caused by shield tunnel construction mainly occurs in front of the shield excavation face. Shield passing through and shield tail through the last three stages. The loss rate of formation and Poisson ratio of soil have a great influence on the surface settlement, but have little effect on the width of the settlement trough. The depth of tunnel has a great influence on the surface settlement and the width of settlement trough. (3) by taking the uneven settlement of the ground surface as the nonlinear boundary condition of track settlement, the analytical solution of track settlement caused by the construction of shield tunneling through ballasted railway is derived. The influence of relevant construction parameters on track settlement is similar to that of roadbed settlement, and the relevant reference suggestions are provided for the determination of rail stiffness and ballast stiffness. (4) the two-stage analysis method of this paper is presented. Applied to the relevant projects of Fuzhou Metro Line 1, the error of the prediction and monitoring of track settlement amplitude is less than 8%. The applicability and correctness of the theoretical method used in this paper to predict the track settlement of soft soil in Fuzhou Metro are verified.
【學位授予單位】：福建工程學院
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.43;U213.157

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