【摘要】：水利水電工程建設(shè)中常常需要在不同地質(zhì)與水文條件下建設(shè)斷面不同、功能各異的隧洞，如引水隧洞，導(dǎo)流隧洞，排洪隧洞，排沙隧洞等等。近年來，我國隧洞開挖及襯砌技術(shù)發(fā)展迅猛。由于盾構(gòu)法有著開挖襯砌安全性高、掘進(jìn)速度快、自動化程度高等優(yōu)點，目前已成為我國隧道施工的主要方法。盾構(gòu)隧洞襯砌在受隧洞荷載作用下需保證隧洞的完整性、耐久性，且需滿足施工方法的要求。因而隧洞的襯砌的設(shè)計和施工對工程的完成尤為重要。 本文選取引洮供水一期工程總干渠7#隧洞為模型，考慮隧洞內(nèi)含水量太高造成土體液化，無法支撐管片襯砌獨立工作的實際工程問題，采用有限元軟件對同一隧洞具有不同襯砌結(jié)構(gòu)進(jìn)行數(shù)值模擬，即對獨立管片襯砌、含工字鋼支護(hù)以及含鋼筋混凝土二次內(nèi)襯支護(hù)下進(jìn)行結(jié)構(gòu)分析比較。本文將進(jìn)行以下研究： a）管片襯砌上的圍巖壓力是管片承受的主要荷載，本文對深埋水工隧道上的圍巖壓力計算方式進(jìn)行了對比，然后根據(jù)實際工程進(jìn)行了詳細(xì)的計算并確定了其合理的取值。 b）分別使用ANSYS和HyperWorks建立盾構(gòu)管片結(jié)構(gòu)的有限元模型，對比了三種不同襯砌結(jié)構(gòu)的受力及變形情況，并對結(jié)果進(jìn)行了對比分析。結(jié)果表明，在含加工字鋼和二次襯砌支護(hù)的管片結(jié)構(gòu)剛度明顯提高，隧洞穩(wěn)定性和牢固性也得到大幅度提升，在施工中可采取此襯砌設(shè)計和施工方法，確保施工安全和管片受力安全。 c）本文構(gòu)建了三維模型，，考慮了工字鋼及管片之間，管片與管片之間的接觸及相互作用，最大限度還原了真實結(jié)構(gòu)。 綜上，通過對不同襯砌結(jié)構(gòu)的數(shù)值模擬發(fā)現(xiàn)，通過對初始管片結(jié)構(gòu)進(jìn)行工字鋼加固及添加二次襯砌，在采取防滲措施以及整體結(jié)構(gòu)中管片、工字鋼肋和二次內(nèi)襯之間有效結(jié)合的條件下，可以確保管道結(jié)構(gòu)的穩(wěn)定運行。
[Abstract]:In the construction of water conservancy and hydropower projects, it is often necessary to construct tunnels with different cross-sections and different functions under different geological and hydrological conditions, such as diversion tunnel, flood discharge tunnel, sand discharge tunnel and so on. In recent years, tunnel excavation and lining technology has developed rapidly in China. Because shield method has the advantages of high safety of excavation lining, fast speed of excavation and high degree of automation, it has become the main method of tunnel construction in our country at present. Under the action of tunnel load, shield tunnel lining needs to ensure the integrity and durability of the tunnel and to meet the requirements of construction methods. Therefore, the design and construction of tunnel lining is particularly important to the completion of the project. In this paper, the tunnel of main canal in the first phase of water diversion project is selected as the model, considering the actual engineering problem that the soil liquefaction caused by too high water content in the tunnel can not support the independent work of segment lining. The finite element software is used to simulate the different lining structure of the same tunnel, that is to say, the structure analysis and comparison are carried out under the independent segment lining, the I-steel support and the reinforced concrete secondary lining support. In this paper, the pressure of surrounding rock on the lining of: a) segment is the main load of the segment, and the calculation method of surrounding rock pressure on the deep buried hydraulic tunnel is compared in this paper. Then the detailed calculation is carried out according to the actual project and the reasonable value is determined. B) the finite element models of shield segment structure are established by using ANSYS and HyperWorks respectively. The stress and deformation of three different lining structures are compared and the results are compared and analyzed. The results show that the stiffness of segment structure with I-steel and secondary lining support is obviously improved, and the stability and stability of tunnel are greatly improved. The lining design and construction method can be adopted in construction. Ensure construction safety and segment safety. C) in this paper, a three-dimensional model is constructed, which takes into account the contact and interaction between I-steel and segments, and the interaction between segments and segments, thus reducing the real structure to the maximum extent. In summary, through the numerical simulation of different lining structures, it is found that by strengthening the initial segment structure with I-steel and adding the secondary lining, the segments are used in the anti-seepage measures as well as in the whole structure. The stable operation of pipeline structure can be ensured under the condition of effective combination between I-beam rib and secondary lining.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV554

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