本文選題：淺埋暗挖 + 飽和黃土　； 參考：《蘭州交通大學》2017年碩士論文

【摘要】：在我國各大城市高速建設的同時,交通擁堵、城市交通基礎設施建設滯后、城市交通抗災害能力不足等問題也逐漸顯現(xiàn)出來,并對城市的進一步發(fā)展起到了反作用。城市軌道交通系統(tǒng)是緩解大城市交通擁堵狀況、改善城市生態(tài)環(huán)境、保證城市發(fā)展持續(xù)穩(wěn)定的最優(yōu)方式之一,具有綠色、節(jié)能、環(huán)保、快捷等特點,符合可持續(xù)發(fā)展的原則。同我國其他各大城市一樣,蘭州市也面臨著類似的問題,因此希望通過建設蘭州地鐵工程來解決。作為在西部地區(qū)黃土地層修建、蘭州市的第一條地鐵工程,其面臨著一系列問題。本文以蘭州地鐵一號線一期TJⅢ-16工區(qū)東崗站后配線段的大跨區(qū)間隧道為依托工程,針對蘭州地區(qū)飽和黃土地層中大跨區(qū)間隧道的施工過程中圍巖變形進行研究。在本文中,以三維仿真數(shù)值模擬為手段,對比研究在考慮流固耦合效應和不考慮流固耦合效應兩種情況下,飽和黃土圍巖的應力場、地表沉降、拱部下沉、周邊收斂、支護結(jié)構(gòu)受力的變化情況。根據(jù)本文研究項目施工現(xiàn)場的施工設計參數(shù)、圍巖地質(zhì)條件、實際施工措施,分別建立CRD法、雙側(cè)壁導坑法模型對開挖支護階段進行了全過程分析,并以雙側(cè)壁導坑法為基礎,在考慮流固耦合的條件下,通過對雙側(cè)壁導坑法的施工進行優(yōu)化,以期找到最優(yōu)的施工方法。本文主要的研究成果有:(1)通過對比分析可知,基于流固耦合計算模式求解得到的結(jié)果,與不考慮耦合效應時兩者的結(jié)果有較大差異。因此,對于飽和黃土的模擬,應考慮土中水的作用,否則將對結(jié)果造成較大影響;(2)對比CRD法與雙側(cè)壁導坑法的分析結(jié)果,在飽和黃土隧道中,同等條件下六部CRD對于地表沉降、圍巖變形的控制效果要優(yōu)于雙側(cè)壁導坑法。通過噴射混凝土封閉掌子面后,雙側(cè)壁導坑法對于圍巖土體變形的控制效果略優(yōu)于六部CRD法;(3)通過對比雙側(cè)壁導坑法的不同優(yōu)化結(jié)果,雙側(cè)壁導坑法預留核心土相對于其他情況,對于控制地表沉降、拱部下沉效果最好;當核心土的長度為1m時,控制變形相對而言最好。綜上所述,文章以實際工程為依托對象,對淺埋大跨度飽和黃土區(qū)間隧道進行了數(shù)值模擬分析,對施工方法提出合理性建議,可以為后續(xù)地鐵淺埋暗挖隧道施工提供參考和指導。
[Abstract]:At the same time, the traffic congestion, the lagged construction of urban traffic infrastructure and the insufficient ability of urban traffic to resist disasters have gradually appeared in the high-speed construction of major cities in China, and have played a counterproductive role in the further development of cities. Urban rail transit system is one of the best ways to alleviate traffic congestion, improve urban ecological environment and ensure sustainable and stable urban development. It has the characteristics of green, energy saving, environmental protection, quick and so on, and conforms to the principle of sustainable development. Like other major cities in China, Lanzhou is faced with similar problems, so it is hoped to solve the problem through the construction of Lanzhou Metro Project. As the first subway project in Lanzhou, which is built in the west of China, it faces a series of problems. Based on the large-span inter-area tunnel in the rear distribution section of Donggang Station in the first phase of Lanzhou Metro Line 1, this paper studies the deformation of surrounding rock in the construction process of the large-span inter-zone tunnel in saturated loess layer in Lanzhou area. In this paper, the stress field, ground subsidence, arch subsidence and circumference convergence of saturated loess surrounding rock are studied by means of three-dimensional simulation numerical simulation, considering the fluid-solid coupling effect and the fluid-solid coupling effect. The change of the force on the supporting structure. According to the construction design parameters, surrounding rock geological conditions and actual construction measures of the construction site of the project, the CRD method and the double-side wall guide pit method model are established respectively to analyze the whole process of excavation support stage, and based on the double-side wall guide pit method. Under the condition of fluid-solid coupling, the construction of double-sidewall guide pit method is optimized in order to find the best construction method. The main research results in this paper are as follows: (1) by comparison and analysis, we can see that the results obtained based on the fluid-solid coupling model are quite different from those obtained without considering the coupling effect. Therefore, for the simulation of saturated loess, the effect of water in soil should be considered, otherwise it will have a great influence on the results. Compared with the analysis results of CRD method and double-sidewall guide pit method, in the saturated loess tunnel, the six CRDs are used for ground subsidence under the same conditions. The control effect of surrounding rock deformation is better than that of double side wall guide pit method. After spraying concrete closed face, the control effect of double-side wall guide pit method on the deformation of surrounding rock soil is slightly better than that of six-part CRD method / 3) by comparing the different optimization results of double-side wall guide pit method. Compared with other conditions, the method of double side wall guide pit reserving core soil has the best effect on controlling surface subsidence, and when the length of core soil is 1 m, the control deformation is the best. To sum up, based on the actual project, the paper carries out numerical simulation analysis on the shallow buried large-span saturated loess section tunnel, and puts forward some reasonable suggestions to the construction method. It can provide reference and guidance for the construction of shallow-buried underground tunnel.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U455.4

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本文編號：1997180