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| Model test on the development process of frozen wall boundary in steel pipe- frozen soil synergistic structure |
| HUANG Feng1，2，SHI Rongjian1，2，YUE Fengtian1，2，WANG Kun1，2 |
(1.State Key Laboratory for Geomechanics and Deep Underground Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China；2. School of Mechanics and Civil Engineering，China University of Mining and Technology，Xuzhou，Jiangsu 221116，China)
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Abstract Steel pipe-frozen soil synergistic structure is a new freezing model，controlling the development of the frozen wall boundary during the freezing process is the key to restraining the impact of frost heave and thaw settlement on the environment. Taking the freezing reinforcement project of Jiangpu Road Station of Shanghai Metro Line 18 as the background，model tests were designed and conducted based on similar theoretical，which on the development process of frozen wall boundary of steel pipe-frozen soil synergistic structure，analysing the influence law of steel pipe and circulating water on the boundary development，and conclusions were drawn as followed：The development of frozen soil can be inhibited by steel pipe set at the boundary of the frozen wall，which can also expand the temperature gradient at the boundary of the frozen wall，making the frozen wall more uniform. When freezing 32 days，the temperature difference between the inner and outer sides of single-row and double-row steel pipes can reach 11.2 ℃ and 7.6 ℃，while the temperature of the frozen soil outside the steel pipe is 6.7 ℃ and 10.7 ℃ higher than the corresponding position at the bottom of the freezing pipes. The outward expansion of frozen soil boundary can be effectively controlled by 4 ℃ of the circulating water，further improving the uniformity of the frozen wall. The temperature difference between the inner and outer sides of the frozen soil boundary steel pipes reaches 18.3 ℃ when freezing 32 days，and the temperature of the frozen soil outside the steel pipes is 16.9 ℃ higher than the corresponding position at the lower part of the freezing pipes. The research results show that the expansion of the frozen soil can be effectively controlled by the steel pipes or 4 ℃ circulating water placed at boundary of the frozen wall，improving the uniformity of the frozen wall，and significantly weakening the influence of frost heave on the surrounding environment during the freezing process，while the effect of 4 ℃ circulating water at the boundary position is better.
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2022, Vol. 41 
