深埋式輸水隧洞初期支護(hù)對(duì)二次襯砌結(jié)構(gòu)的受力影響研究
[Abstract]:At present, a large number of long-distance cross-basin water diversion projects have been built in China, such as the South-to-North Water transfer Project, the Han to Wei Project and the "Dishui Network Project" in Shanxi Province. Deep buried water diversion tunnel plays an important role in these water diversion projects. However, in most water conservancy projects, the influence of initial support on secondary lining in the process of tunnel excavation is not taken into account in the design of secondary lining structure, and it is completely regarded as a safety reserve, which is inconsistent with the actual project, which often leads to the large section size of secondary lining structure and too conservative design. Although it can ensure the safety of the tunnel to a certain extent, it results in the increase of engineering quantity and some unnecessary waste. The deep reason is that there are still many problems in the theory and calculation of lining structure. In the composite lining, what role the initial support plays in the tunnel construction, what is the influence of the initial support on the secondary lining structure, is the main bearing structure, what is the bearing ratio, or the safety reserve, these are the problems that perplexed the designers. These problems have become the bottleneck in the design of deep buried water transmission tunnel in China, which seriously restricts the progress of tunnel design level. Therefore, combined with the actual situation of the project, it is very necessary to analyze the bearing mechanism of the initial support and the secondary lining structure, and to carry out the research on the influence of the initial support of the deep buried water tunnel on the stress of the secondary lining structure. In view of the above problems, by summing up the mechanism of initial support and the calculation method of secondary lining, the bearing mode of initial support and secondary lining is analyzed, and the load release coefficient analysis method based on finite element analysis is put forward. By using this method, taking the typical deep buried water tunnel of the Yellow River diversion Project in the middle of Shanxi Province as the research object, the numerical model is established to simulate the release process of surrounding rock stress in different stages of the construction of the water diversion tunnel, the influence of the initial support on the secondary lining structure under different load release coefficients and the field monitoring data are analyzed, and the general laws of the load ratio of the initial support load and the internal force of the secondary lining structure are summarized. It provides a reference for the design optimization of lining section of the same kind of deep buried water transmission tunnel.
【學(xué)位授予單位】:華北水利水電大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:TV31;TV554
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