淺埋暗挖大斷面黃土地鐵隧道荷載作用特征研究
[Abstract]:With the continuous development of Xi'an subway construction and the superiority of shallow underground excavation method, there will be more and more subway projects with large cross-section of shallow buried excavation in loess layer. However, because of the special physical and mechanical properties of loess, the engineering characteristics of loess tunnel are quite different from those of ordinary tunnel, and the design and construction technology of shallow loess tunnel with large section still needs to be further improved and improved. Therefore, based on the Xi'an Metro Line 3 solid project, through theoretical analysis, field testing, numerical simulation and other research means, In this paper, the characteristics of load action and supporting structure of large section loess subway tunnel are studied. The main work is as follows: firstly, extensive investigation and collection of literature related to this subject. This paper summarizes and sums up the existing research results of shallow excavation method, loess tunnel and large section subway tunnel, which lays a foundation for the following work. Secondly, based on the salty ~ long section of Xi'an Metro Line No. 3, a comprehensive and systematic field test is carried out. By installing pressure box, steel bar meter, surface strain gauge and concrete strain gauge in surrounding rock and supporting system, the stress state of supporting structure is monitored and a large number of test data are obtained. Based on the measured results, the surrounding rock pressure and the mechanical characteristics of the supporting structure of the large section loess subway tunnel are analyzed. The main conclusions are as follows: the overall contact pressure is small and large, the lateral pressure and the bottom pressure of arch foot are large, the removal of brace and the application of second lining have great influence on it; The results of calculating the pressure of shallow surrounding rock by using the mature and commonly used formulas are conservative, the grid arch frame has not been fully formed in the initial stage of support, and the support effect is obvious when the temporary support is removed. The stress of the middle section steel is obvious, especially the pilot tunnel. The surrounding rock stress is mainly released through the excavation of the leading tunnel, and the support should be closed in time when the diversion tunnel is staggered and excavated. The ratio of initial support to second liner is 35.32% and 64.68% respectively. As the main bearing body, the second liner bears most of the load, and the internal force of concrete varies greatly in different positions, the side wall and above are compressed, and the inverted arch is pulled. Finally, the supporting engineering is simulated with finite element software, and the excavation and support of tunnel are simulated by two-dimensional model, and the mechanical characteristics of shallow buried large section loess subway tunnel support structure are analyzed and studied. And the results are compared with the field test results. The research results of this paper can provide certain theoretical basis and guidance for the design and construction of shallow buried large section loess subway tunnel and similar underground engineering.
【學(xué)位授予單位】:長安大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2014
【分類號(hào)】:U231;U451
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