【摘要】：目前針對合肥市區(qū)地質條件及周邊環(huán)境的地鐵隧道盾構施工,暫無相應成熟工程經(jīng)驗借鑒。鑒于此,本論文選取合肥軌道交通1號線盾構施工過程中的兩個典型工況,即下穿南—環(huán)城市隧道及下穿南淝河,開展地鐵盾構施工過程的動態(tài)數(shù)值仿真分析。研究了施工過程中地表變形及地層變形受力情況,運用破壞接近度指標評價隧道周圍區(qū)域巖土體的穩(wěn)定性程度,研究典型工況下合肥地鐵盾構施工的安全問題,對以后合肥地區(qū)的地鐵盾構施工具有一定的理論和工程指導價值。本文主要完成的工作有：(1)通過查閱大量國內(nèi)外文獻,總結了國內(nèi)外學者在盾構施工方面的研究成果,根據(jù)研究的背景及目的,闡述了本文的主要研究內(nèi)容；(2)簡要地介紹了盾構施工引起地層變形、流固耦合等基本理論,并且引入了破壞接近度指標,介紹了相關基本理論;(3)針對盾構下穿南一環(huán)既有城市隧道施工存在的安全風險,運用FLAC3D實現(xiàn)了隧道盾構開挖的模擬,分析了盾構推進過程中既有城市隧道結構以及在建隧道應力應變分布規(guī)律；(4)針對盾構下穿南淝河施工存在的安全風險,運用FLAC3D進行了隧道盾構下穿河流開挖過程的模擬,對比分析了相同條件下的流固耦合和彈塑性計算結果,闡述了水的滲流影響在盾構下穿河流施工穩(wěn)定性分析中是必須考慮的因素；(5)基于破壞接近度對盾構隧道開挖過程中隧道周邊巖土體穩(wěn)定性進行分析。通過破壞接近度指標可以正確評價隧道周圍各區(qū)域巖土體的穩(wěn)定性程度,破壞接近度分布及演化規(guī)律對研究施工中應采取的預防措施具有重要的指導意義。
[Abstract]:At present, there is no relevant mature engineering experience for shield tunneling construction of metro tunnel in accordance with the geological conditions and surrounding environment in Hefei. In view of this, this paper selects two typical working conditions of shield tunneling in Hefei Rail Transit Line 1, that is, through the Nanhuan City Tunnel and the Nanfeihe River, to carry out the dynamic numerical simulation analysis of the subway shield construction process. The ground deformation and ground deformation during construction are studied, the stability of rock and soil around the tunnel is evaluated by using the damage proximity index, and the safety problems of shield construction in Hefei metro under typical working conditions are studied. It has certain theoretical and engineering guiding value for the shield tunneling construction in Hefei area. The main works of this paper are as follows: (1) through consulting a large number of domestic and foreign literature, summarized the domestic and foreign scholars in shield construction research results, according to the background and purpose of the study, elaborated the main research content of this paper; (2) the basic theories of ground deformation and fluid-solid coupling caused by shield tunneling are briefly introduced, and the damage proximity index is introduced, and the relevant basic theories are introduced. (3) in view of the safety risks existing in the construction of existing urban tunnels under shield tunneling, The simulation of shield excavation is realized by FLAC3D, and the distribution of stress and strain in the existing city tunnel structure and the tunnel under construction are analyzed. (4) the safety risk of tunneling through Nanfeihe River under shield tunneling is analyzed. FLAC3D is used to simulate the excavation process of river under shield tunneling, and the results of fluid-solid coupling and elastic-plastic calculation under the same conditions are compared and analyzed. The influence of water seepage on the stability analysis of river under shield tunneling is discussed. (5) the stability of surrounding rock and soil in shield tunnel excavation is analyzed based on the degree of damage proximity. The stability degree of rock and soil around the tunnel can be correctly evaluated by the damage proximity index. The distribution of failure proximity and the law of evolution have important guiding significance for the study of preventive measures to be taken in construction.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：U455.43;U231.3

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