本文選題：地鐵隧道 + 車站�。� 參考：《蘭州交通大學(xué)》2015年碩士論文

【摘要】：隨著我國城市地下空間開發(fā)利用的廣泛興起,特別是城市地鐵隧道規(guī)劃建設(shè)的快速推進,不可避免的會遇到越來越復(fù)雜的近接工程問題。為了確保近接工程的順利進行,就必須保證鄰近既有建(構(gòu))筑物的結(jié)構(gòu)安全及正常使用功能;那么在施工過程中采取何種施工技術(shù)及輔助工法,以及在設(shè)計施工中如何有效預(yù)測和避免沉降、塌陷的發(fā)生,使對既有建(構(gòu))筑物及地下管線的影響降到最低,并確保施工安全,同時實現(xiàn)較高的經(jīng)濟效益,是目前急需研究解決的問題。本文以深圳市地鐵7號線密貼下穿既有4號線車站工程為背景,采取理論研究、有限元數(shù)值分析及基于數(shù)值模擬分析沉降監(jiān)測等方法,利用ADINA有限元分析軟件建立計算模型,對全斷面注漿加固和CRD平頂直墻暗挖下穿既有線車站施工方案進行了模擬研究。通過分析量化了施工過程中存在的各類風(fēng)險要點,為工程的順利實施以及類似工程開展提供理論依據(jù)和合理的預(yù)測分析。論文主要工作內(nèi)容如下:1.針對論文選題中的實際工程仍處于施工初期階段,且缺乏實測資料等情況,本文重點對工程近接下穿施工方案、工程難點及相關(guān)要素進行了理論評估和預(yù)測分析,制定了相應(yīng)的對策措施,并結(jié)合現(xiàn)場工程地質(zhì)勘查資料,利用工程類比方法確定各類材料參數(shù),通過ADINA有限元軟件模擬計算證明取值是合理的。2.在大量查閱關(guān)于沉降機理的相關(guān)數(shù)值解析方法理論及研究成果的基礎(chǔ)上,并充分考慮了加固區(qū)相關(guān)參數(shù)的選取及對應(yīng)措施,通過數(shù)值模擬方法進行了近接下穿開挖施工對既有線隧道的各類響應(yīng)分析。3.按照Peck經(jīng)驗公式及相關(guān)理論,得知隧道開挖引起的橫向地層沉降規(guī)律,即橫向沉降槽曲線可以用正態(tài)分布曲線來表示;縱向地表沉降會隨著隧道的開挖掘進逐漸趨于穩(wěn)定,該理論可作為模擬檢測數(shù)據(jù)的合理性判據(jù)。4.通過有限元分析軟件ADINA對論文中近接下穿工程CRD開挖施工方案進行了模擬分析,按照施工方案明確的開挖順序進行了施工步序的生死單元定義,通過不同的開挖步,對開挖引起的既有線車站結(jié)構(gòu)沉降變形及安全運營等影響因素進行了分析預(yù)測,模擬計算得知既有線車站地板最大豎向變形為0.45mm小于控制值,而且初襯頂板最大收斂值為0.80mm小于控制值,均滿足精度要求,同時發(fā)現(xiàn)計算值存在偏小的問題,應(yīng)存在一定誤差,但從模擬結(jié)果來看總的響應(yīng)規(guī)律是比較符合理論實際的。
[Abstract]:With the development and utilization of urban underground space in China, especially the rapid development of urban subway tunnel planning and construction, it is inevitable to meet more and more complex problems of proximity engineering. In order to ensure the smooth progress of the adjacent construction, it is necessary to ensure the structural safety and normal use function of the adjacent existing buildings, and then what construction techniques and auxiliary methods should be adopted in the construction process, And how to effectively predict and avoid settlement and collapse in design and construction, so as to minimize the influence on existing buildings and underground pipelines, and to ensure the safety of construction, and to achieve higher economic benefits. At present, it is urgent to study and solve the problem. In this paper, based on the project of Shenzhen Metro Line 7, the method of theoretical research, finite element numerical analysis and settlement monitoring based on numerical simulation is adopted to establish the calculation model by using Adina finite element analysis software. The construction scheme of full section grouting reinforcement and CRD flat roof straight wall tunneling through existing railway station is simulated and studied. By analyzing and quantifying all kinds of risk points in the construction process, this paper provides theoretical basis and reasonable forecast analysis for the smooth implementation of the project and the development of similar projects. The main contents of the thesis are as follows: 1: 1. In view of the fact that the actual project is still in the initial stage of construction, and lack of the measured data, this paper focuses on the theoretical evaluation and prediction of the construction scheme, engineering difficulties and related elements of the project. The corresponding countermeasures and measures are worked out, combined with the field engineering geological survey data, various material parameters are determined by using the engineering analogy method, and the value is proved to be reasonable by using Adina finite element software simulation calculation. On the basis of a large number of related numerical analytical methods and research results on settlement mechanism, the selection of relevant parameters and corresponding measures in the reinforcement area are fully considered. Through numerical simulation method, various kinds of response analysis of the tunnel under the close connection are carried out. 3. According to Peck empirical formula and related theory, it is known that the law of lateral ground settlement caused by tunnel excavation, that is, the curve of transverse settlement trough can be expressed by normal distribution curve, and the longitudinal surface settlement will gradually become stable with the excavation of tunnel. This theory can be used as the rationality criterion of simulated test data. Through the finite element analysis software Adina, the paper simulates and analyzes the construction scheme of CRD excavation in the near connection project, defines the birth and death unit of the construction step according to the definite excavation sequence of the construction plan, and through different excavation steps. The influence factors such as settlement deformation and safe operation of the existing railway station structure caused by excavation are analyzed and forecasted. The simulation results show that the maximum vertical deformation of the existing railway station floor is less than the control value of 0.45mm. Moreover, the maximum convergence value of the initial liner is smaller than the control value, which satisfies the precision requirement. At the same time, it is found that the calculation value is small, and there should be some errors. But from the simulation results, the overall response law is more in line with the theory and practice.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U231.3;U455.4

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本文編號：2063310