Abstract In order to understand the artificial freezing technology employed in the deep pit，a physical model test of stress and deformation of large diameter round-shaped frozen soil wall was carried out on a self-developed large test rig. The laws were obtained among the horizontal displacement of the frozen soil wall and the factors of the excavation depth，frozen soil wall diameter，and the average of temperature of frozen soil. The changing laws in the exposure of frozen soil wall were also obtained. The results show that the horizontal displacement of wall increases as the depth and diameter increase during excavation，but decrease as the average of temperature decreases. The horizontal displacement of the exposure of frozen soil wall increases as the excavation depth increases，and the characteristics of the larger deformation in the center and the smaller ones in both sides were obtained. There are the different ratios of elastic displacement to the total displacement under different temperatures，and it increases from 30%(－4 ℃) to 90%(－18 ℃). The analysis indicates that the diameter and depth of foundation pit are the major factors that affect horizontal displacement of the frozen soil wall，and the effects of average of temperature，wall thickness and excavation height are comparatively smaller.
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Received: 14 September 2006
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