【摘要】：隨著城市地鐵建設(shè)的迅猛發(fā)展,地下軌道交通線路越來(lái)越多。由于規(guī)劃設(shè)計(jì)滯后或者周邊存在既有結(jié)構(gòu)體,使得立體交叉線路不得不進(jìn)行穿越施工。目前,凍結(jié)法已成為暗挖隧道安全穿越施工中一種最可靠的工法。然而,凍脹融沉現(xiàn)象又不可避免的造成既有結(jié)構(gòu)的變形甚至破壞。武漢市軌道交通機(jī)場(chǎng)線盤(pán)龍城站~宏圖大道站區(qū)間6#聯(lián)絡(luò)通道下穿3#隧道凍結(jié)法施工,屬于長(zhǎng)距離聯(lián)絡(luò)通道近距離穿越既有隧道工程。本文通過(guò)理論模型計(jì)算、數(shù)值模擬和物理模型試驗(yàn)相結(jié)合的方法對(duì)該工程案例進(jìn)行詳細(xì)研究。首先,將經(jīng)典的平面隨機(jī)介質(zhì)理論擴(kuò)展到三維,推導(dǎo)出空間地層任意微單元體開(kāi)挖造成上方任意位置處的各個(gè)方向位移變化計(jì)算公式。在此基礎(chǔ)上,建立能夠預(yù)測(cè)凍融作用引起上部地層任意一點(diǎn)位移變化的三維凍脹融沉計(jì)算模型。隨后,運(yùn)用建立的三維凍脹融沉計(jì)算模型對(duì)工程案例進(jìn)行計(jì)算。通過(guò)計(jì)算結(jié)果的分析,得到6#長(zhǎng)距離聯(lián)絡(luò)通道凍結(jié)法施工過(guò)程中,上部3#線既有隧道位置處的地層凍脹、融沉位移變化規(guī)律。其次,利用ANSYS有限元軟件,對(duì)工程案例建立數(shù)值計(jì)算模型。通過(guò)對(duì)該案例進(jìn)行典型參數(shù)研究,模擬6#長(zhǎng)距離聯(lián)絡(luò)通道凍結(jié)法施工。分析計(jì)算結(jié)果,得到凍結(jié)施工過(guò)程中上部3#線既有隧道凍脹融沉位移變化規(guī)律。接著對(duì)3#隧道凍脹位移開(kāi)展單因素影響研究。再次,基于相似理論,對(duì)工程案例進(jìn)行�；O(shè)計(jì),并在實(shí)驗(yàn)室實(shí)施物理模擬試驗(yàn)。最后,對(duì)理論解析、有限元數(shù)值計(jì)算和模型試驗(yàn)得出的結(jié)論相互對(duì)比驗(yàn)證,總結(jié)出本文研究成果,并對(duì)后續(xù)工作提出研究展望。
[Abstract]:With the rapid development of urban subway construction, there are more and more underground rail transit lines. Due to the delay of planning and design or the existence of existing structures in the periphery, the crossing line has to be constructed. At present, freezing method has become the most reliable method in tunneling safe crossing construction. However, the phenomenon of frost heaving and thawing will inevitably cause deformation and even destruction of existing structures. The freezing construction of tunnel under 6 # contact channel between Panlong City Station and Hongtu Avenue Station of Wuhan rail transit airport line belongs to the project of long distance contact channel and short distance passing through the existing tunnel. In this paper, the engineering case is studied in detail by the combination of theoretical model calculation, numerical simulation and physical model test. Firstly, the classical theory of plane random medium is extended to 3D, and the formula of displacement variation in every direction caused by the excavation of arbitrary microelement in space stratum is deduced. On this basis, a three-dimensional frost heave and thawing settlement model is established to predict the change of displacement at any point in the upper stratum caused by freeze-thaw process. Then, the three-dimensional frost heaving and thawing settlement model is used to calculate the engineering case. Through the analysis of the calculation results, the variation of frost heaving and thawing displacement of the upper section of the tunnel is obtained during the construction of the freezing method of 6 # long distance connection channel. Secondly, the numerical model of engineering cases is established by using ANSYS finite element software. By studying the typical parameters of this case, the construction of 6 # long distance contact channel freezing method is simulated. By analyzing the calculation results, the variation law of frost heave and thawing settlement displacement of the existing tunnel on the upper wall of the upper wall is obtained during the freezing construction. Then the influence of single factor on the frost heaving displacement is studied. Thirdly, based on the similarity theory, the simulation design of engineering cases is carried out, and the physical simulation test is carried out in the laboratory. Finally, the conclusions of theoretical analysis, finite element numerical calculation and model test are compared and verified, the research results of this paper are summarized, and the research prospects for the follow-up work are put forward.
【學(xué)位授予單位】：中國(guó)礦業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：U451

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本文編號(hào)：2320040