Distribution Law of Freezing Temperature Field in Connecting Channel of Water Rich Soft Soil Layer

In order to explore the change of soil temperature field in the connecting channel of water rich soft soil layer during freezing construction, taking a connecting channel of Hangzhou Shaoxing intercity railway project as an example, the temperature field distribution and frozen wall thickness of the connecting channel are studied by using field measurement and numerical simulation. The results show that affected by the heat dissipation of the segments and the inclined arrangement of the freezing tubes, the thickness of the freezing wall will first increase continuously, then decrease slightly, and finally return to a gentle trend with the increase of the depth. When the depth is 2.192 m, the thickness of the freezing wall is the largest, and when the depth is greater than 6.640 m, the thickness of the freezing wall tends to be stable; The soil in the frozen area of the connecting channel can be divided into heat dissipation influence section, freezing pipe layout influence section and freezing stability section; The optimized laying mode of thermal insulation materials and the optimized segment structure can effectively improve the freezing effect of the soil near the segment end of the tunnel, and increase the thickness of the frozen wall at the bell mouth by about 53.8%.