Study On The Surrounding Rock Temperature Field And Thermal Insulation Technology Of Cold And High-speed Railway Tunnel

With the vigorous development of Chinese economic construction and the further implement of western development policy, the number of the tunnel and other traffic engineering which constructed under the condition of high altitude and cold is increasing, the research of cold regions tunnel project as an important topic has also been referred to the agenda.With the help of large commercial fluid software FLUENT, this paper simulations the heat convection of air in cold regions tunnel and surrounding rock, analyzes the tunnel length, the speed of dominant wind, ambient temperature, the initial temperature of the surrounding rock and the cross-sectional forms on the influence of the temperature field distribution of the air inside cold regions tunnel, and analyzes the temperature field distribution of surrounding rock which in conditions of thermal insulation layer and without adding insulation. To conclude the impact of the frost heaving force of the surrounding rock on the role of the tunnel structure,this paper uses the finite element analysis software ANSYS to simulate and calculate the frost heaving force of the surrounding rock in conditions of different position and different water size.The main research content of this article has the following several aspects:(1) Based on the fluid mechanics, heat transfer and the theory of solid mechanics, this paper builds a 3d simulation model of tunnel-lining-surrounding rock to discuss the temperature field distribution of cold regions tunnel;(2) There are many factors that can affect the cold regions tunnel temperature field.This article considers five aspects of the tunnel length, the speed of dominant wind, ambient temperature, the initial temperature of the surrounding rock and the cross-sectional forms to conclude the influence of various factors on the cold regions tunnel temperature field;(3) With the help of the theory of water frost heaving, this article considers five parts of arch, arch waist, side wall, arch foot and inverted arch to conclude the influence of different areas of the frost-heaving force, and study the influence of different sizes of water to the lining structure;(4) With the ShuangMiaoZi cold regions tunnel as the research background,this paper analyzes the temperature field distribution of surrounding rock which in conditions of thermal insulation layer and without adding insulation to study the effect of the thermal insulation layer.