Abstract
At present, the built or newly built underground structures are mostly concentrated in developed areas along the coast, lakes, and rivers, while deep soft soil is widely distributed in these areas. The cold heat treatment method is one of the advanced foundation treatments and has broad application prospect. However, geothermal exchange and temperature field change are complex Stefan problems with mobile boundaries, internal heat sources, and phase changes. It is important to determine the freezing area and freezing temperature reasonably under the premise of ensuring the safety of the frozen construction. Therefore, this paper summarizes the research methods of freezing method construction of cross passage and introduces the research on the constitutive model of freezing undisturbed soil, the theory of freezing wall calculation, and the evolution mechanism of the temperature field. Then, a brief evaluation is made in view of the lack of research, and the development direction of this field is put forward with the research characteristics. It is to deepen the understanding of the deformation mechanism of cross passage embedded in soft soil caused by the freezing and melting.
Highlights
Since the 21st century, the urban population size and living space are under tremendous pressure with the continuous acceleration of urbanization. e development of underground space is undoubtedly an effective means to relieve traffic congestion and improve the living environment
The built or newly built underground structures are mostly concentrated in developed areas along the coast, lakes, and rivers, while deep soft soil is widely distributed in these areas. e cross passage connecting the upper and lower tunnels has the dual functions of emergency evacuation and collection and drainage, and it is an indispensable part of subway construction
Without considering the heat loss and groundwater flow, a thin slice with a thickness of 1 m was taken as the research object, and it is considered that the research object is homogeneous and continuous within the range of the thin slice. erefore, the freezing temperature field can be simplified as an axisymmetric plane problem. e temperature field of freezing zone is calculated by using the stable heat conduction of circular tube. e calculation process is extended from the temperature field of freezing column of single freezing tube to the temperature field of freezing wall
Summary
Received 20 November 2020; Revised 10 March 2021; Accepted 17 March 2021; Published 25 March 2021. En, a brief evaluation is made in view of the lack of research, and the development direction of this field is put forward with the research characteristics. Erefore, this paper summarizes the research methods of freezing method construction of cross passage and introduces the research on the constitutive model of freezing undisturbed soil, the theory of freezing wall calculation, and the evolution mechanism of the temperature field. It is to deepen the understanding of the deformation mechanism of cross passage embedded in soft soil caused by the freezing and melting
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