引洮供水工程隧洞衬砌加固分析

发布时间：2019-02-11 18:13

【摘要】：水利水电工程建设中常常需要在不同地质与水文条件下建设断面不同、功能各异的隧洞，如引水隧洞，导流隧洞，排洪隧洞，排沙隧洞等等。近年来，我国隧洞开挖及衬砌技术发展迅猛。由于盾构法有着开挖衬砌安全性高、掘进速度快、自动化程度高等优点，目前已成为我国隧道施工的主要方法。盾构隧洞衬砌在受隧洞荷载作用下需保证隧洞的完整性、耐久性，且需满足施工方法的要求。因而隧洞的衬砌的设计和施工对工程的完成尤为重要。本文选取引洮供水一期工程总干渠7#隧洞为模型，考虑隧洞内含水量太高造成土体液化，无法支撑管片衬砌独立工作的实际工程问题，采用有限元软件对同一隧洞具有不同衬砌结构进行数值模拟，即对独立管片衬砌、含工字钢支护以及含钢筋混凝土二次内衬支护下进行结构分析比较。本文将进行以下研究： a）管片衬砌上的围岩压力是管片承受的主要荷载，本文对深埋水工隧道上的围岩压力计算方式进行了对比，然后根据实际工程进行了详细的计算并确定了其合理的取值。 b）分别使用ANSYS和HyperWorks建立盾构管片结构的有限元模型，对比了三种不同衬砌结构的受力及变形情况，并对结果进行了对比分析。结果表明，在含加工字钢和二次衬砌支护的管片结构刚度明显提高，隧洞稳定性和牢固性也得到大幅度提升，在施工中可采取此衬砌设计和施工方法，确保施工安全和管片受力安全。 c）本文构建了三维模型，，考虑了工字钢及管片之间，管片与管片之间的接触及相互作用，最大限度还原了真实结构。综上，通过对不同衬砌结构的数值模拟发现，通过对初始管片结构进行工字钢加固及添加二次衬砌，在采取防渗措施以及整体结构中管片、工字钢肋和二次内衬之间有效结合的条件下，可以确保管道结构的稳定运行。
[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.
【学位授予单位】：西北农林科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV554

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