Abstract： Based on the monitoring data of bored pile and soil slope of south anchor foundation of Runyang Yangtze River Suspension Bridge, the soil above certain depth is in compaction state, and the soil below it is in loose state. Thus it is proposed that the soil pressure on froze wall above this depth is the passive pressure and that below it is the active pressure, and the forces should be calculated by the theories of the passive and active earth pressures, respectively. Meantime, a conclusion is drawn that the force on the pile in row, the frost-heaving force caused by the frozen wall and the soil pressure on the frozen wall are the same in value. Compared with the piles in row with conventional sealing piles, the force on piles is earth pressure in passive state, and it is 37% to 184% greater than the active earth pressure calculated by the conventional theory. The above results provide a theoretical reference for the design of excavations by means of the freezing method.
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