季节性浅冻地区冻土路基处理探讨

Discussion on the Treatment of Frozen Soil Subgrade in Seasonally Shallow Frozen Areas

季节性浅冻地区由于冻土较浅,冻结一般在路基外部进行,路基在冻融循环过程中形成冻土核和未冻土核,从而使路基产生不均匀沉降变形。参考当地标准冻深,设想将路基分为冻融区和非冻区,在两区间设导流导温通道从而进行冷热能量交换,并在非冻区外设隔水层阻隔自由水进入,路基外部冻融区实现冻融循环功能,非冻区主要承担道路传来荷载起承重作用。

Due to the shallow frozen soil in the seasonal shallow freezing area,freezing is generally carried out outside the subgrade.Frozen soil cores and unfrozen soil cores are formed in the process of freezing and thawing cycles of the subgrade,resulting in uneven settlement deformation of the subgrade.With reference to the local standard freezing depth,it is envisaged to divide the subgrade into freeze-thaw area and non freezing area.The two sections are provided with diversion and thermal conductivity channels to exchange cold and hot energy,and an impermeable layer is set outside the non freezing area to prevent free water from entering.The freeze-thaw area outside the subgrade realizes the function of freeze-thaw cycle.The non freezing area mainly bears the load transmitted from the road to play a load-bearing role.