The strength of frozen soil will decrease obviously if it is thawed, especially when ice lens is abundant in it, which is the main cause of the mud pumping in subgrade as well as the instability of foundation in seasonal frozen ground regions.

• 摘要冻土，特别是含冰透镜体的冻土解冻时，出现强度大幅度下降的弱化现象，这是季节冻土区内路基春季翻浆冒泥、地基失稳的重要原因。