多年冻土和季节性冻土属于不良工程地质条件，其物理特性、力学和热学性能决定了冻胀和融沉工程病害对线路基础稳定性的影响程度。
The permafrost or seasonal frozen soils are undesirable engineering geologic condition and the frost heave and thawing settlement will influence the stability of foundations.
多年冻土和季节性冻土属于不良工程地质条件，其物理特性、力学和热学性能决定了冻胀和融沉工程病害对线路基础稳定性的影响程度。
The permafrost or seasonal frozen soils are undesirable engineering geologic condition and the frost heave and thawing settlement will influence the stability of foundations.
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