發(fā)布時(shí)間：2018-05-14 21:28

  本文選題：盾構(gòu) + 地下穿越�。� 參考：《天津大學(xué)》2014年碩士論文

【摘要】：石家莊地鐵一號(hào)線一期即將進(jìn)入大規(guī)模興建時(shí)期，隧道工程在施工過(guò)程中必然受到規(guī)劃線路上各種復(fù)雜周邊環(huán)境的制約，穿越各種高架橋、既有建筑物、構(gòu)造物、管線等，在保證工程正常施工情況下，還要確保施工擾動(dòng)對(duì)地表產(chǎn)生的各種影響在可控范圍之內(nèi)。本文以石家莊地鐵1號(hào)線石家莊東站-東杜莊站盾構(gòu)區(qū)間隧道下穿地表石德鐵路為背景，對(duì)地鐵盾構(gòu)隧道施工對(duì)既有運(yùn)營(yíng)鐵路的影響進(jìn)行評(píng)估分析與研究。 本文的主要研究?jī)?nèi)容包括：（1）分析介紹了盾構(gòu)法隧道施工對(duì)地層的擾動(dòng)機(jī)理以及地層沉降的主要特征，以石家莊地鐵1號(hào)線實(shí)際地質(zhì)條件為背景，利用有限元軟件ANSYS14.0建立三維有限元模型，，分析預(yù)測(cè)盾構(gòu)法施工對(duì)地表既有線路造成的沉降變形及水平變形影響；（2）根據(jù)施工條件，利用Ansys14.0有限元軟件對(duì)雙隧道施工工序進(jìn)行優(yōu)化，對(duì)比當(dāng)兩隧道的開挖面前后有間距時(shí)鐵路的沉降差異，得到：當(dāng)兩隧道開挖前后間距大于24m時(shí)，鐵路沉降與兩隧道先后單獨(dú)開挖時(shí)結(jié)果接近，地表鐵路不再因隧道開挖順序不同而產(chǎn)生附加的變形影響，為以后類似工程施工與設(shè)計(jì)提供參考。（3）建立彈性本構(gòu)模型、彈塑性本構(gòu)模型、以及彈性-彈塑性混合模型進(jìn)行對(duì)比，分析了彈塑性模型與彈性模型在沉降計(jì)算中的差異性，并根據(jù)土體發(fā)生塑性變形的局域性建立彈性-彈塑性混合模型，對(duì)結(jié)構(gòu)計(jì)算進(jìn)行合理優(yōu)化。（4）根據(jù)有限元子結(jié)構(gòu)法原理，利用Ansys中超單元對(duì)彈塑性模型進(jìn)行簡(jiǎn)化計(jì)算，在保證得到精確解的條件下，節(jié)省數(shù)值模擬計(jì)算所消耗的計(jì)算機(jī)時(shí)，為大規(guī)模工程模擬的合理簡(jiǎn)化提供參考。
[Abstract]:The first phase of Shijiazhuang Metro Line 1 is about to enter the period of large-scale construction. During the construction process of the tunnel project, it is bound to be restricted by various complicated surrounding environments on the planned lines, crossing all kinds of viaducts, existing buildings, structures, pipelines, etc. In order to ensure the normal construction of the project, but also to ensure that the construction disturbance on the surface of the various effects within a controllable range. Based on Shijiazhuang Metro Line 1 Shijiazhuang East Station-Dongduzhuang Station Shield tunneling under the ground surface Shide railway as the background of the subway shield tunnel construction on the existing operational railway impact analysis and research. The main research contents of this paper include: (1) analyzing and introducing the disturbance mechanism of shield tunneling construction and the main characteristics of stratum settlement, taking the actual geological conditions of Shijiazhuang Metro Line 1 as the background. The three-dimensional finite element model is established by using the finite element software ANSYS14.0, and the influence of shield construction on the settlement and horizontal deformation of the existing lines on the ground is analyzed and predicted. According to the construction conditions, the double tunnel construction procedure is optimized by using the Ansys14.0 finite element software. By comparing the difference of railway settlement between the two tunnels before and after excavation, it is concluded that when the distance between the two tunnels before and after excavation is more than 24m, the result of railway settlement is close to that of the two tunnels when they are excavated separately. The surface railway no longer has the additional deformation effect due to the different excavation sequence of the tunnel. It provides a reference for the construction and design of similar projects in the future. (3) the elastic constitutive model, the elastic-plastic constitutive model, and the elasto-elastoplastic mixed model are established and compared. The difference between elastic-plastic model and elastic model in settlement calculation is analyzed. According to the localization of plastic deformation of soil mass, the elastic-plastic mixed model is established, and the structure calculation is reasonably optimized. 4) according to the principle of finite element substructure method, Using the superelement in Ansys to simplify the elastic-plastic model can save the computer consumed by numerical simulation and provide a reference for the reasonable simplification of large-scale engineering simulation under the condition that the exact solution is obtained.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U455.43;U231.3

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