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通过对润扬长江公路大桥南汊悬索桥南锚碇基础实测桩体和土体测斜资料的分析,认为基坑采用冻结法作止水帷幕后,埋深一定深度以上坑外土体处于压密状态、这一深度以下土体处于松塌状态,提出这一埋深以上土压力应按被动土压力理论进行计算、下段土压力可按主动土压力理论进行计算的设计理念;同时认为作用在排桩上的力与冻结过程中产生的冻胀力、以及冻土壁后侧的土压力大小相等。这一工程中,与采用常规止水桩的排桩支护相比,排桩所受的力为被动状态下的土压力,实测值大于常规按主动土压力计算的37%～184%。上述设计理念和结论可为冻结法基坑围护设计提供一般理论参考。
Based on the analysis of the measured data of inclined body and soil measured by the south anchorage of the Nanxun Suspension Bridge of Runyang Yangtze River Highway Bridge, it is considered that the soil outside the pit is in a compact state , The soil under this depth is in a loose condition. It is proposed that the earth pressure above this depth should be calculated according to the theory of passive earth pressure, and the earth pressure in the lower part can be calculated according to the theory of active earth pressure. At the same time, The forces on the ice are equal to the frost heaving force generated during the freezing process and the earth pressure on the back of the frozen soil wall. In this project, compared with the row pile support using the conventional water-stop pile, the force received by the row pile is the earth pressure in the passive state, and the measured value is larger than 37% ~ 184% of the conventional calculation according to the active earth pressure. The above design concepts and conclusions can provide a general theoretical reference for the design of the foundation pit protection in freezing method.