發(fā)布時間：2018-01-30 16:22

  本文關(guān)鍵詞： 淺埋暗挖 地表沉降 隧道洞室穩(wěn)定性 隨機介質(zhì)理論 層次分析法 折減法　出處：《東華理工大學》2017年碩士論文　論文類型：學位論文

【摘要】：我國近年采用淺埋暗挖法修筑的城市地下鐵路隧道變得越來越多,然而使用這種工法施工隧道的過程中必將出現(xiàn)地表沉降及隧道洞室穩(wěn)定性問題。過大的地表沉降會導(dǎo)致地表建筑物或構(gòu)筑物失穩(wěn)破壞,施工操作不當或支護不及時則會導(dǎo)致隧道洞室失穩(wěn)坍塌。然而,由于城市施工場地復(fù)雜、水文地質(zhì)條件較差,使得隧道施工過程中地表沉降及洞室穩(wěn)定性問題更加突出;因此研究淺埋暗挖法隧道施工對地表沉降及洞室穩(wěn)定性的影響具有十分重要的現(xiàn)實意義。本論文在對國內(nèi)外相關(guān)文獻資料進行廣泛調(diào)研的基礎(chǔ)上,以昆明市軌道交通線路為工程背景,采用理論分析、數(shù)值模擬、現(xiàn)場實測相結(jié)合的方法,對淺埋暗挖法隧道施工過程中地表沉降及隧道洞室穩(wěn)定性問題進行了深入、系統(tǒng)的研究,取得的成果和主要內(nèi)容如下:(1)分析總結(jié)了淺埋暗挖法施工隧道過程中影響地表沉降和隧道洞室穩(wěn)定性的主要因素,以及隧道洞室破壞形式及特征;同時從地層細觀結(jié)構(gòu)失穩(wěn)、地層損失以及土體固結(jié)沉降三方面對地表沉降進行理論分析。(2)簡化了隨機介質(zhì)理論提出的地表橫向沉降公式;并通過改變隨機介質(zhì)理論的原有假設(shè)——淺埋暗挖法施工隧道過程中土體由于擾動而產(chǎn)生排水固結(jié),對簡化的隨機介質(zhì)理論地表橫向沉降公式進行了修正,最后得出了隨機介質(zhì)理論地表橫向沉降簡化修正公式;通過隨機介質(zhì)理論地表橫向沉降簡化修正公式與劉建航修正的Peck經(jīng)驗公式的對比,驗證了地表橫向沉降簡化修正公式的正確性。(3)建立了層次分析法評價淺埋暗挖法隧道施工過程中洞室穩(wěn)定性的遞進層次結(jié)構(gòu)模型,并計算出了各級指標的權(quán)重;同時采用強度折減法及位移折減法對層次分析法評價淺埋暗挖法隧道施工過程中洞室穩(wěn)定性的結(jié)果進行修正,并得到了修正公式。(4)通過三維數(shù)值仿真計算得出了昆明市軌道交通線路隧道施工引起的地表沉降值及隧道洞室穩(wěn)定性安全系數(shù);將地表橫向沉降仿真模擬值、實測值與簡化修正公式計算所得的理論值進行對比,驗證了地表橫向沉降簡化修正公式的實用性;仿真計算得出的隧道洞室穩(wěn)定性安全系數(shù)為1.12,也就是說淺埋暗挖法隧道施工過程中洞室處于一般穩(wěn)定狀態(tài)。
[Abstract]:In recent years, there are more and more urban underground railway tunnels constructed by shallow excavation in China. However, the problems of surface settlement and tunnel cavern stability will occur in the process of tunnel construction by this method, and excessive surface settlement will lead to the failure of surface buildings or structures. Improper construction operation or untimely support will lead to the collapse of tunnel cavern instability. However, because of the complex construction site in the city, the hydrogeological conditions are poor. In the process of tunnel construction, the problems of surface settlement and cavern stability are more prominent. Therefore, it is of great practical significance to study the influence of shallow tunneling construction on surface subsidence and cavern stability. Taking Kunming rail transit line as the engineering background, the method of combining theoretical analysis, numerical simulation and field measurement is adopted. In this paper, the problems of surface settlement and tunnel cavity stability during the construction of shallow tunneling are studied in depth and systematically. The main achievements and contents are as follows: (1) the main factors which affect the surface settlement and the stability of tunnel cavern in the process of shallow tunneling are analyzed and summarized, as well as the failure forms and characteristics of tunnel caverns. At the same time, the theoretical analysis of ground surface settlement is made from three aspects of formation meso-structure instability, formation loss and consolidation settlement of soil, which simplifies the formula of surface lateral settlement proposed by random medium theory. And by changing the original assumption of random medium theory-shallow burying and digging method in the construction of tunnel process of soil drainage consolidation due to disturbance, the simplified formula of lateral surface settlement of random medium theory is modified. Finally, the simplified correction formula of surface lateral settlement in random medium theory is obtained. The comparison between the simplified correction formula of surface lateral settlement based on random medium theory and the Peck empirical formula modified by Liu Jianhang is presented. Verify the correctness of the simplified correction formula of surface lateral settlement. (3) establish a progressive hierarchical structure model of AHP to evaluate the stability of tunnel caverns in the construction process of shallow buried tunneling method. The weight of each index is calculated. At the same time, the strength reduction method and displacement reduction method are used to modify the results of AHP to evaluate the stability of tunnel in the process of shallow burying tunneling. The modified formula is obtained. (4) the surface settlement caused by the construction of Kunming rail transit tunnel and the safety factor of tunnel cavern stability are obtained by three-dimensional numerical simulation. By comparing the simulated values, the measured values and the theoretical values of the simplified correction formula, the practicability of the simplified correction formula of the surface lateral settlement is verified. The safety factor of tunnel cavern stability calculated by simulation is 1.12, that is to say, the cavern is in a general stable state during the construction of shallow burying tunneling method.
【學位授予單位】：東華理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U456.3

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