本文選題：紅層地層 + 交叉隧道�。� 參考：《西南交通大學(xué)》2017年碩士論文

【摘要】：城市化建設(shè)的推進(jìn),將地鐵建設(shè)引入一個(gè)新的高潮,地下空間的局限性使得隧道近接情況日趨頻繁,因此有必要開展盾構(gòu)隧道交叉近接運(yùn)營地鐵隧道地層變形規(guī)律及其控制技術(shù)研究。本文以長沙市軌道交通3號(hào)線交叉下穿運(yùn)營地鐵1號(hào)線為工程依托,通過數(shù)值模擬及現(xiàn)場測試對紅層地層盾構(gòu)交叉近接施工地層變形規(guī)律進(jìn)行分析;通過數(shù)值模擬及信息化監(jiān)測系統(tǒng)的反饋分析對紅層地層盾構(gòu)交叉近接施工控制技術(shù)進(jìn)行研究。得到以下結(jié)論:.(1)在紅層地層變形規(guī)律方面,研究得到在新建隧道拱頂1.5D至地表以及在新建隧道拱頂1D范圍內(nèi)豎向位移隨埋深均趨于線性變化,且后者位移隨埋深的變化速率較前者提高了 50%左右,速率發(fā)生變化是在新建隧道拱頂1D～1.5D的范圍內(nèi)。當(dāng)先行隧道施工完成,既有管片底部位移占新建隧道拱頂位移的56%,既有隧道拱頂位移占新建隧道拱頂位移的43%,地表位移占新建隧道拱頂位移的28%;同時(shí),右線開挖對左線隧道拱頂上方地中位移造成了不同程度的影響,其影響程度隨著埋深的增大而逐漸降低。(2)在盾構(gòu)掘進(jìn)參數(shù)對地層擾動(dòng)規(guī)律方面,研究得到土艙壓力及同步注漿壓力的增大均對地層豎向位移起到限制作用。從地表橫向位移來看,隨著土艙壓力的增大位移增長比逐漸趨于平緩,土艙壓力在0.24MPa以內(nèi)變動(dòng)時(shí)對地表豎向位移的限制效果較為明顯;同步注漿壓力對地表沉降的影響較為顯著,位移增長比隨同步注漿壓力基本呈線性變化,控制同步注漿壓力對于控制地表變形起著至關(guān)重要的作用。從地表縱向位移來看,隨著土艙壓力的增大,掌子面前方4倍洞徑左右地表有隆起現(xiàn)象,表明當(dāng)土艙壓力過大,會(huì)導(dǎo)致前方土體隆起變形,但同步注漿壓力對盾構(gòu)前方的隆陷變形影響不大。(3)從盾構(gòu)掘進(jìn)參數(shù)對運(yùn)營地鐵隧道結(jié)構(gòu)影響來看,土艙壓力及同步注漿壓力的增大有助于減小軌道板的不均勻沉降,且土艙壓力在0.24MPa以內(nèi)變動(dòng)時(shí)對既有隧道軌向不均勻沉降的限制是明顯的;另外,拱頂彎矩隨著土艙壓力和同步注漿壓力的增大而呈現(xiàn)增大趨勢,左側(cè)墻角軸力隨著土艙壓力和同步注漿壓力的增大也呈現(xiàn)增大的趨勢,但影響均不明顯。(4)從盾構(gòu)施工控制角度來看,當(dāng)土艙壓力在0.08MPa～0.24MPa時(shí),同步注漿壓力在0.2MPa～0.5MPa時(shí),盾構(gòu)掘進(jìn)過程中地表隆陷以及既有隧道結(jié)構(gòu)的變形可得到有效控制。
[Abstract]:With the development of urbanization, subway construction is introduced into a new climax, and the limitation of underground space makes the close connection of tunnels become more and more frequent. Therefore, it is necessary to study the ground deformation law and control technology of shield tunnel. In this paper, based on the project of Changsha Metro Line 1, the deformation law of red stratum shield tunneling is analyzed by numerical simulation and field test. Through numerical simulation and feedback analysis of information monitoring system, the construction control technology of shield tunneling in red bed is studied. The following conclusions are obtained: (1) in terms of the deformation law of the red beds, the vertical displacement tends to change linearly with the buried depth from 1.5 D to the surface of the arch roof of the newly built tunnel and 1D range of the arch top of the newly built tunnel. The change rate of the latter displacement with buried depth is about 50% higher than that of the former, and the change of the rate is within the 1D~1.5D range of the new tunnel vault. When the first tunnel construction is completed, the displacement at the bottom of the existing segment accounts for 56 of the displacement of the arch top of the new tunnel, the displacement of the arch top of the existing tunnel occupies 43% of the displacement of the arch top of the new tunnel, and the surface displacement accounts for 28% of the displacement of the arch top of the new tunnel. The excavation of the right line affects the displacement of the ground above the arch of the left tunnel to varying degrees, and the influence degree decreases gradually with the increase of the depth of burying. (2) in the respect of the disturbance law of shield tunneling parameters to the stratum, It is found that the increase of soil chamber pressure and simultaneous grouting pressure limit the vertical displacement of strata. From the point of view of lateral surface displacement, with the increase of soil chamber pressure, the increasing ratio of displacement tends to be gentle, and the effect of limiting vertical displacement is obvious when the soil chamber pressure changes within 0.24MPa. The effect of synchronous grouting pressure on surface subsidence is significant, and the displacement increasing ratio changes linearly with synchronous grouting pressure. Controlling synchronous grouting pressure plays an important role in controlling surface deformation. From the surface longitudinal displacement, with the increase of soil chamber pressure, there is a uplift in the surface around 4 times the diameter of the tunnel in front of the palm, which indicates that if the soil chamber pressure is too large, it will lead to the deformation of the soil uplift in the front. However, the influence of synchronous grouting pressure on the uplift deformation in front of shield tunneling is not significant. According to the influence of shield tunneling parameters on the structure of subway tunnel, the increase of soil chamber pressure and synchronous grouting pressure is helpful to reduce the uneven settlement of track plate. When the earth chamber pressure changes within 0.24MPa, the limit to the uneven settlement of the existing tunnel track is obvious, in addition, the bending moment of the vault increases with the increase of the earth chamber pressure and the synchronous grouting pressure. The axial force of the left corner increases with the increase of soil chamber pressure and synchronous grouting pressure, but the influence is not obvious. From the view of shield construction control, when the earth chamber pressure is in 0.08MPa~0.24MPa, the synchronous grouting pressure is in 0.2MPa~0.5MPa. Surface subsidence and deformation of existing tunnel structures can be effectively controlled during shield tunneling.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U455.43;U231

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