本文選題：沉管隧道 + 不均勻沉降�。� 參考：《浙江大學(xué)》2015年碩士論文

【摘要】：隨著沉管隧道技術(shù)的日益成熟,更多的跨河(海)工程選擇沉管法來(lái)施工。然而作為一種特殊水下隧道,管段的不均勻沉降及變形將導(dǎo)致管段開(kāi)裂、滲漏等嚴(yán)重問(wèn)題,直接影響到隧道的壽命和安全。本文主要通過(guò)理論推導(dǎo)及有限元模擬對(duì)沉管隧道管段沉降進(jìn)行深入分析,通過(guò)實(shí)測(cè)對(duì)沉管隧道管段變形進(jìn)行研究。本文主要?jiǎng)?chuàng)新點(diǎn)和結(jié)論如下： (1)在修正的彈性地基梁法基礎(chǔ)上,對(duì)K的取值方法和接頭約束方式進(jìn)行了改進(jìn),使之更符合實(shí)際工程,提出了新的計(jì)算沉管隧道縱向不均勻沉降的方法。并以舟山沈家門(mén)港海底沉管隧道為例,進(jìn)行了詳細(xì)的算例分析。 (2)把沉管隧道基礎(chǔ)層和地基土層整體定義為復(fù)合地基,用彈簧代表基礎(chǔ)層,Kelvin模型代表地基土,提出采用三參數(shù)模型來(lái)模擬復(fù)合地基。在彈性地基梁解的基礎(chǔ)上,根據(jù)對(duì)應(yīng)性原理和三參數(shù)模型本構(gòu)關(guān)系,利用拉普拉斯變換推導(dǎo)出沉管隧道三參數(shù)模型的沉降解析解。 (3)假定軟土地區(qū)海底沉管隧道地基土為Kelvin模型,車(chē)輛荷載是隨時(shí)間變化的波動(dòng)荷載形式,引入粘彈性地基梁模型,利用模態(tài)疊加法進(jìn)而給出了三種情況下沉管隧道的豎向位移、彎矩和地基反力的解答。結(jié)合天津海河沉管隧道工程實(shí)例,分析了車(chē)輛速度、地基土模量對(duì)沉管隧道豎向位移及彎矩的影響。發(fā)現(xiàn)車(chē)速對(duì)管段振動(dòng)的頻率產(chǎn)生影響,且車(chē)速越快,振動(dòng)越劇烈,但對(duì)振幅沒(méi)有影響；地基模量對(duì)管段振動(dòng)的振幅影響很大,且地基模量越小,振幅越大,但對(duì)振動(dòng)周期沒(méi)有影響。 (4)采用光纖光柵傳感器對(duì)舟山沈家門(mén)港海底沉管隧道的管節(jié)應(yīng)變進(jìn)行監(jiān)測(cè),并對(duì)實(shí)測(cè)數(shù)據(jù)進(jìn)行分析,研究了各截面測(cè)點(diǎn)實(shí)測(cè)應(yīng)變值隨時(shí)間的變化規(guī)律以及潮汐荷載對(duì)管段應(yīng)變的影響。(5)利用MIDAS GTS軟件對(duì)舟山沈家門(mén)港海底沉管隧道進(jìn)行了三維模擬,得到了各管段的不均勻沉降,及管段應(yīng)力變形的結(jié)果,并且與第二章理論計(jì)算隧道縱向不均勻沉降值及實(shí)測(cè)值進(jìn)行比對(duì)分析。
[Abstract]:With the development of sinking tunnel technology, more and more cross-river (sea) projects are constructed by pipe sinking method. However, as a special kind of underwater tunnel, the uneven settlement and deformation of the pipe section will lead to serious problems such as cracking and leakage of the pipe section, which will directly affect the life and safety of the tunnel. In this paper, the settlement of pipe section of immersed tube tunnel is deeply analyzed by theoretical derivation and finite element simulation, and the deformation of pipe section of immersed tunnel is studied by actual measurement. The main innovations and conclusions of this paper are as follows: 1) on the basis of the modified beam method of elastic foundation, the method of calculating the value of K and the constraint mode of joint are improved to make it more suitable for practical engineering. A new method for calculating the longitudinal uneven settlement of immersed tunnel is put forward. A detailed numerical example is given for the submarine tunnel of Shenmen Port in Zhoushan. 2) the submersible tunnel foundation layer and the foundation soil layer are defined as composite foundation, and the Kelvin model of foundation layer is used to represent the foundation soil. A three-parameter model is proposed to simulate the composite foundation. On the basis of the beam solution of elastic foundation, according to the correspondence principle and the constitutive relation of the three-parameter model, the settlement analytical solution of the three-parameter model of the immersed tube tunnel is derived by Laplace transformation. (3) assuming that the submersible tunnel foundation soil in soft soil area is Kelvin model, the vehicle load is a fluctuating form with time variation, the viscoelastic foundation beam model is introduced, and the vertical displacement of three cases of sinking tube tunnel is given by using the modal superposition method. Solutions to bending moment and foundation reaction. In this paper, the influence of vehicle speed and soil modulus on vertical displacement and bending moment of submerged pipe tunnel is analyzed with the example of Tianjin Haihe immersed tunnel. It is found that the velocity has an effect on the vibration frequency of the pipe segment, and the faster the speed, the more intense the vibration, but not the amplitude, and the greater the amplitude of the foundation modulus, the greater the vibration amplitude of the pipe segment, and the smaller the foundation modulus is, the greater the vibration amplitude is. But it has no effect on the vibration cycle. FBG sensor is used to monitor the strain of pipe joint in the tunnel of Shenmen Harbor, Zhoushan, and the measured data are analyzed. The variation law of measured strain value with time and the influence of tidal load on the strain of pipe section are studied. The 3-D simulation of the tunnel in Shenjiaogang, Zhoushan, is carried out by using MIDAS GTS software, and the uneven settlement of each section is obtained. And the results of stress and deformation of the pipe segment are compared with the theoretical calculation of longitudinal uneven settlement of tunnel and the measured value in chapter 2.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U459.5;U455.46

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