Finite element analysis of the concrete lining channel frost heaving based on the changing temperature of the whole day

In order to find out the developing regularity of frost heaving pressure and frost heaving deformation of concrete lining changed with temperature in the daytime and at night, basing on the mechanics and the theory of physics of the frozen soil, using ANSYS to do numerical simulation of the frost heaving process of the concrete lining, loading the temperature by the transient temperature change mode, this paper researches the temperature field and frost heaving distortion and changing rule of the normal frost heaving pressure and the tangential frost heaving pressure with the time. The results showed that the causes of the frozen and thawing destruction of the canal included not only the frost heaving of basic soil of the canal, but also the uneven, asymmetric, asynchrony changes of temperature, frost heaving deformation and frost heaving pressure at the two slopes of the canal. Soil of shady slope was frozen about 15 days earlier than that of sunny slope, the maximum frost heaving pressure and frost heaving amount appeared about 4 days later than the daily average lowest temperature, the maximum frost heaving pressure and frost heaving amount in one day appeared no more than 1 hour later than the daily lowest temperature. The results agree well with those of local test, but were bigger than those of the firm form numerical simulation, which indicates that using transient numerical simulation to design the canal preventing frost heaving is correct and rational.