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季节性冻土区深基坑支护冻胀影响问题常常由于温差不大、冻融时间较短容易被忽略,但某些特殊情况下冻胀影响产生的基坑坍塌事故却屡见不鲜。对基坑边坡冻胀机理及计算方法进行了总结描述,结合北京某深基坑支护工程,通过对2011～2012年冬季冻胀影响过程的监测与相应处理措施实施效果分析,总结了桩锚支护结构体系的冻胀影响因素,提出了相应注意事项、预防及处理措施。
In general, due to the small temperature difference and the short freezing and thawing time, the influence of frost heaving of deep foundation pit in seasonal permafrost zone is often neglected. However, it is not uncommon for foundation pit collapse accidents caused by frost heave in some special situations. This paper summarizes the frost heaving mechanism and calculation method of foundation pit slope. Combined with the support project of a deep foundation pit in Beijing, the paper analyzes the effect of winter frost heaving process from 2011 to 2012 and the corresponding treatment measures, Anchor supporting structure system frost heaving factors, put forward the corresponding precautions, prevention and treatment measures.