Abstract
Artificial ground freezing (AGF) technology characterized by good waterproof performance, wide adaptability, minimal pollution, and other advantages has been widely used in the construction of tunnel cross passages buried in the soft soil layers. Based on the in situ monitoring, the temperature field of the freezing wall and the deformation field around a cross passage are studied in this paper. The results show that the descent speed of the soil temperature is large at the beginning and becomes small gradually, and finally tends to be stable. The frozen cylinders are enclosing in the phase transformation stage of water. The closer to the freezing pipes the soil is, the faster the soil temperature drops. The temperature of the soil inside the freezing wall is lower than that of the soil outside the freezing wall. The frost heave capacity at the center of the cross passage is the largest, so is the growth rate of the frost heave. The results can offer a reference to the design and construction of the cross passages buried in the soft soil areas.
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Acknowledgments
This work presented in this paper was supported by the National Key Research and Development Program of China (2017YFC1500702) and by the Fundamental Research Funds for the Central Universities (Grant No. 2013QNA44).
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Responsible Editor: Zeynal Abiddin Erguler
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Zhan, ZX., Cui, ZD., Yang, P. et al. In situ monitoring of temperature and deformation fields of a tunnel cross passage in Changzhou Metro constructed by AGF. Arab J Geosci 13, 310 (2020). https://doi.org/10.1007/s12517-020-05285-y
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DOI: https://doi.org/10.1007/s12517-020-05285-y