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  本文關鍵詞： 盾構隧道 覆土厚度 淺覆土 壁后注漿　出處：《天津大學》2014年碩士論文　論文類型：學位論文

【摘要】：由于我國經(jīng)濟的不斷發(fā)展,城市對隧道建設的需要日益顯著,隧道建設成為當前研究的重要課題,我國復雜的地理環(huán)境不斷地對隧道技術的發(fā)展提出更高的要求。盾構隧道下穿內陸河時,由于隧道坡度不宜過大一般會導致上覆土厚度較小,此處淺覆土受施工的擾動較大,處理不當可能會引起不必要的工程事故,因此對上層淺覆土的研究是解決此類工程問題的關鍵。本文依托于江陰市澄江西路二期工程,參考大量相關文獻,對盾構隧道穿越內陸河處淺覆土的相關機理進行探討和研究,并用Abaqus有限元分析軟件對盾構推進過程進行模擬,并與實際工程進行比較,提出具有可操作性的上層土加固措施。具體工作如下:首先,探討隧道上層淺覆土受盾構施工的擾動機理和其破壞機理,在前人研究的基礎上對引起土體擾動的四個階段進行驗證,得出軟土地層施工中不同階段對土體擾動程度比例。其次,工程中隧道在淺覆土下發(fā)生上浮分為“靜態(tài)上浮”和“動態(tài)上浮”。現(xiàn)有計算淺層上覆土厚度的計算公式只考慮施工后靜止狀態(tài)下覆土的受力狀態(tài),未考慮施工時注漿壓力對上覆土層的擾動,在實際工程中偏于危險,可能會引起不必要的工程事故。本文在現(xiàn)有最小覆土厚度計算公式基礎上增加土層所受注漿壓力而得出改進的計算公式,討論c、?、管片外徑R、注漿液重度和注漿壓力對改進的計算公式與現(xiàn)有計算公式的影響,并論證其合理性。此外,通過有限元分析軟件依據(jù)剛度遷移原理,模擬隧道開挖的推進過程,計算出隧道開挖過程中的受力及變形分布,探討不同覆土厚度下隧道開挖對上層覆土影響程度,比較不同覆土厚度下開挖隧道的受力和變形分布,得出此工程的最小覆土厚度,并與理論計算進行比較。最后,探討加固淺覆土的施工技術措施,并提出適合本工程的加固上層淺覆土的技術措施,并得到實際工程的驗證。
[Abstract]:Due to the continuous development of our country's economy, the need for tunnel construction in cities is becoming more and more obvious. Tunnel construction has become an important subject of current research. The complex geographical environment of our country has constantly put forward higher requirements for the development of tunnel technology. When the shield tunnel passes through the inland river, the overlying soil thickness will be smaller because the tunnel slope should not be too large. The shallow overlying soil is disturbed greatly by the construction here, and improper handling may cause unnecessary engineering accidents. Therefore, the study of shallow overlying soil is the key to solve this kind of engineering problems. This paper relies on the second phase of Chengjiang West Road, Jiangyin City, referring to a large number of relevant documents. This paper discusses and studies the mechanism of shield tunnel crossing shallow soil in inland river, and simulates the shield tunneling process with Abaqus finite element analysis software, and compares it with the actual project. The concrete work is as follows: first of all, the disturbance mechanism and failure mechanism of shallow overlying soil under shield construction are discussed. On the basis of previous studies, the paper verifies the four stages of soil disturbance, and obtains the proportion of disturbance degree in different stages of soft soil layer construction. The tunnel floating under shallow overlying soil is divided into "static floating" and "dynamic floating". The existing formulas for calculating the thickness of shallow overlying soil only consider the stress state of the overlying soil under static state after construction. The disturbance of grouting pressure to the overlying soil layer is not considered in construction, so it is more dangerous in actual engineering. It may cause unnecessary engineering accidents. In this paper, the improved calculation formula is obtained by adding grouting pressure to soil layer on the basis of calculating formula of minimum overlying soil thickness. The influence of segment outer diameter, grouting fluid weight and grouting pressure on the improved calculation formula and the existing calculation formula is discussed, and its rationality is proved. In addition, the principle of stiffness transfer is based on the finite element analysis software. By simulating the advance process of tunnel excavation, the stress and deformation distribution during tunnel excavation are calculated, and the influence degree of tunnel excavation on the upper layer is discussed under different overlying soil thickness. By comparing the stress and deformation distribution of tunnel excavation under different overburden thickness, the minimum overburden thickness of this project is obtained and compared with the theoretical calculation. Finally, the construction technical measures for strengthening shallow overlying soil are discussed. The technical measures suitable for this project to strengthen the upper layer shallow soil are put forward, and verified by the actual project.
【學位授予單位】：天津大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U455.43

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