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| Field research on artificial freezing of subway cross passages in water-rich silty clay layers |
| GAO Xinjun，LI Mingyuan，ZHANG Jingwei，SONG Jianxue |
| (School of Civil Engineering，Zhengzhou University，Zhengzhou，Henan 450001，China) |
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Abstract The temperature field and the surface deformation of a cross passage constructed in water rich silty clay layers using freezing method were studied based on field test. The results show that the temperature drop trend of each temperature measuring hole is approximately same，but the development rate from the freezing wall to the outside of the freezing pipe is 1.35 times larger than that to the inside during the freezing period. Due to excavation construction，the temperature of each measuring point far away from the excavation boundary decreases faster than that near the excavation boundary，and the influence of excavation on the temperature of soil mass at the freezing main surface is stronger than that at the freezing auxiliary surface. During freezing construction，the vertical displacement change of the ground surface could be divided into small uplift stage，accelerated frost heaving stage，freeze-thaw fluctuation stage，surface subsidence stage and thaw settlement grouting stage. In the early freezing stage，the vertical displacement increases quickly after the intersection of frozen pipes，the excavation of the connecting passage leads to the fluctuation of the vertical displacement which rises as a whole，and 3 months are needed for silty clay reaching the complete thaw state. During excavation，the maximum frost heaving curve and the maximum settlement curve show inverted“V”and“W”shapes respectively. The frost heaving and the settlement of the measuring points above the central axis of the connecting channel are respectively larger and smaller，and the farther away from the central axis，the smaller the frost heaving. It is proposed that the construction time of freezing construction in silty clay layer should not be less than 40 days and the average temperature of freezing wall should be －10 ℃.
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2021, Vol. 40 
