Frost heaving evaluation and protection method for overwintering foundation pit in cold region

The invention discloses a frost heaving evaluation and protection method for an overwintering foundation pit in a cold region. The method comprises the following steps that a, the function relation between the soil body frost heaving rate eta and initial horizontal stress sigma 0 and the function relation between the soil body frost heaving rate eta and supporting structure constraint rigidity K are built; b, proposing a frost heaving simplified analysis method for evaluating frost heaving response of the overwintering foundation pit; and C, foundation pit frost heaving protection technical measures are put forward. Compared with the prior art, the frost heaving evaluation and protection technology for the overwintering foundation pit in the cold region has the advantages that the frost heaving rate of the side wall soil body of the foundation pit under horizontal constraint is mainly influenced by two factors, namely constraint rigidity and horizontal stress of a supporting structure. The two factors can be