地鐵車站出入口側(cè)墻凍脹變形數(shù)值分析
[Abstract]:With the rapid development of economy, the scale of the city is expanding. In this form, the rapid development of rail transit in China. As the hub of urban rail transit, the safety of subway station is related to the normal operation of subway, the life of passengers and the safety of national property. Therefore, it is particularly important to ensure its safety and stability. The mountain area is much cooler than the plain, so subway stations are more vulnerable to freezing in winter when they are in the mountains. In view of the above problems, this paper takes the Ming Tombs scenic spot station in Changping, Beijing as the engineering background. Using the method of theoretical analysis and numerical simulation, the variation law of soil temperature field around the entrance wall in winter operation of the subway station is studied, and the variation law of temperature field of natural soil layer is compared with that of natural soil layer. On this basis, the horizontal frost heave force and horizontal frost heave displacement of the entrance and exit side wall of subway station are calculated by the thermal-mechanical coupling method. The distribution of horizontal frost heaving force and horizontal frost heave displacement along the side wall is analyzed. The main contents of this paper are as follows: (1) the basic formulas of temperature field, moisture field and stress field of frozen soil are studied and deduced. The factors affecting the heat exchange coefficient (heat conductivity, volumetric heat capacity) and mass exchange coefficient (moisture conductivity, differential water capacity) of soil are analyzed in detail, such as total water content, dry density and unfrozen water content. The methods of selecting the parameters are also studied. (2) when the subway station is in operation in winter, this paper analyzes the variation law of the temperature field in the soil layer and natural soil layer around the entrance and exit side wall. The influence of soil initial moisture content on soil temperature field and freezing depth is studied. (3) based on the thermal-mechanical coupling theory and the relationship between temperature and unfrozen water content, the calculation formula of soil thermal expansion coefficient is improved. The formula for calculating the coefficient of thermal expansion of saturated soil in a closed system is derived theoretically. The formula is applied to the numerical calculation, and the calculated results are basically consistent with the actual results. (4) the horizontal frost heave displacement and the distribution of horizontal frost heave force along the side wall of the entrance and exit side wall of subway station are studied. The influence of soil moisture content on the frost heave deformation of side wall and the variation of horizontal frost heave force with freezing time are analyzed. Finally, the frost heave deformation of different types of entrances and exits are compared. (5) the measured values and numerical results are compared and analyzed. It is proved that the distribution of horizontal frost heave force along the buried depth is subjected to soil heat dissipation conditions (bidirectional freezing, unidirectional freezing). The structural form of buildings and the influence of groundwater depth.
【學(xué)位授予單位】:北京交通大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TU445
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