盾構(gòu)隧道管片內(nèi)力分布特性數(shù)值模擬分析
[Abstract]:In recent years, a large number of tunnel projects in the world have greatly promoted the progress of the technology level of shield tunneling. Various countries have been developing in the design and calculation of the structure in the process of shield tunneling construction, and a more effective method has been formed. However, there are no uniform rules on the selection of shield segment calculation model and load calculation method near shield segment under different soil conditions, so various numerical calculation methods have emerged in tunnel and underground engineering. Taking the geological conditions of shield tunnel near Shenyang Station of Shenyang Metro Tunnel No. 1 as a reference, this paper sums up and analyzes three common methods for calculating the internal force of shield tunnel in the design of shield tunnel. Based on the calculation method of soil pressure in soil mechanics theory, a new load-structure model for calculating the distribution of internal forces in segments is proposed. The effects of different joint types, tunnel depth, segment diameter, elastic modulus of soil and Poisson ratio on the internal force characteristics of shield segment are analyzed. Considering the in-situ stress release in shield tunnel construction, the internal force distribution of shield tunnel segments under different stress release rates is simulated by finite element method. By comparing the ground subsidence caused by the shield tunnel construction simulated by the finite element method with the observed values in the field, the in-situ stress release rate caused by the construction of a subway tunnel is determined. According to the plane hypothesis of beam bending in material mechanics, the analytical expression of moment distribution ratio of shield tunnel double-layer lining structure is derived. Two typical examples of double-layer lining structure of shield tunnel are numerically simulated by finite element method. The results show that the analytical solution is in good agreement with the bending moment distribution ratio of finite element numerical simulation, which verifies the correctness of the analytical solution. The relationship between the primary lining of shield tunnel segment and the internal force characteristics of secondary lining is studied, and the influence of relaxation earth pressure theory of deep buried tunnel on the internal force of shield tunnel segment is analyzed, taking Qiongzhou Channel Tunnel with high water pressure and large buried depth as an example.
【學(xué)位授予單位】:大連理工大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2016
【分類號】:U455.43
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