本文選題：盾構(gòu)　切入點(diǎn)：地鐵　出處：《安徽建筑大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：盾構(gòu)法以其獨(dú)有的高效、智能、安全等特點(diǎn)和優(yōu)勢(shì)成為目前城市地鐵建設(shè)中普遍采用的方法,但是采用這種方法會(huì)引起土層不同程度的沉降,當(dāng)沉降比較大時(shí),就可能會(huì)使土層中已埋的管線發(fā)生變形,嚴(yán)重時(shí)可能會(huì)斷裂,破壞城市的管線系統(tǒng),造成不必要的經(jīng)濟(jì)損失和城市危害。針對(duì)合肥地鐵一號(hào)線沿線的一段盾構(gòu)法施工的路段,本文研究了采用盾構(gòu)法施工對(duì)地表沉降產(chǎn)生的影響,運(yùn)用MIDAS/GTS三維有限元軟件創(chuàng)建盾構(gòu)法隧道施工的三維模型,數(shù)值模擬了盾構(gòu)對(duì)已埋管線的影響,總結(jié)出地表沉降以及管線的變化規(guī)律,分析了不同開挖段地表的沉降變化。地表沉降槽曲線近似服從高斯正態(tài)分布,沉降的最大值處于隧道軸線的正上方,由隧道軸線向兩邊成對(duì)稱分布狀態(tài)。由隧道軸線向兩端,地表的沉降值逐漸減小,隨著盾構(gòu)的不斷推進(jìn),地表的沉降增加的速度越來(lái)越快。同時(shí)將數(shù)值模擬的結(jié)果與Peck經(jīng)驗(yàn)公式法計(jì)算所得數(shù)據(jù)進(jìn)行擬合,驗(yàn)證了數(shù)值模擬方法在本工程中的可靠性。通過(guò)對(duì)盾構(gòu)推進(jìn)過(guò)程中,改變管道與隧道的相對(duì)距離、管線的材質(zhì)、管線的直徑等參數(shù),分析這些參數(shù)改變下管線變化規(guī)律以及管線最大沉降的變化。隨著管線與隧道相對(duì)距離的增加,管線的變形逐漸減小;管線的直徑逐漸增加,其變形逐漸減小;當(dāng)管線的彈性模量減小時(shí),管線的變形逐漸增大。在本文的最后,給出了一些管線的控制標(biāo)準(zhǔn),同時(shí)采用不同的方法,計(jì)算管線的允許曲率半徑,對(duì)管道接縫的張開值進(jìn)行驗(yàn)算,提出幾點(diǎn)盾構(gòu)推進(jìn)時(shí)管線的保護(hù)方法。
[Abstract]:The shield method is widely used in urban subway construction because of its unique characteristics and advantages, such as high efficiency, intelligence, safety, etc. However, using this method will cause the settlement of soil layers to different degrees, when the settlement is relatively large, It may cause deformation of buried pipelines in the soil layer, break up seriously, destroy the city's pipeline system, cause unnecessary economic losses and urban hazards. In view of a section of shield tunneling construction along Hefei Metro Line 1, In this paper, the influence of shield tunneling on ground subsidence is studied. The 3D model of shield tunnel construction is created by using MIDAS/GTS software, and the effect of shield tunneling on buried pipeline is numerically simulated. The variation law of surface subsidence and pipeline is summarized, and the surface subsidence changes in different excavation sections are analyzed. The surface subsidence trough curve is approximately distributed from Gao Si normal distribution, and the maximum settlement is located directly above the tunnel axis. From the axis of the tunnel to the two ends of the tunnel, the settlement value of the surface gradually decreases, as the shield machine continues to advance, At the same time, the numerical simulation results are fitted with the data obtained by Peck empirical formula method, which verifies the reliability of the numerical simulation method in this project. Changing the relative distance between pipeline and tunnel, the material of pipeline, the diameter of pipeline, and so on, and analyzing the variation law of pipeline and the maximum settlement of pipeline under the change of these parameters. With the increase of relative distance between pipeline and tunnel, the relative distance between pipeline and tunnel is increased. The deformation of the pipeline decreases gradually, the diameter of the pipeline increases, the deformation of the pipeline decreases gradually, and the deformation of the pipeline increases gradually when the elastic modulus of the pipeline decreases. At the end of this paper, some control standards of the pipeline are given. At the same time, different methods are used to calculate the allowable curvature radius of pipeline, to check the opening value of pipeline joint, and to put forward several protection methods for pipeline during shield tunneling.
【學(xué)位授予單位】：安徽建筑大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455.43;TU990.3

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