东北寒区灌渠冻胀水分迁移规律试验研究

Experimental Study on the Moisture Migration Regulation of Channel Frost Heaving in Northeast China

东北寒区渠道土体发生冻胀破坏情况较为常见,是影响灌溉渠道正常运行的一大隐患。水分迁移规律是冻胀研究中的一个重要课题。通过对农垦北安管局建设农场冻胀破坏严重渠道土体建立一维冻胀水分迁移模型,以冻结温度、初始含水量及干密度为因素进行封闭系统恒温单向正交试验。试验结果表明:冻胀发生后,水分由未冻区域向冻结区域迁移现象明显,冻结锋面处水分聚集程度最高。在试验条件下,水分迁移量随土壤初始含水量增大而增加,随冻结温度升高逐渐下降,土壤干密度对水分迁移影响较小。

Frost heaving in irrigation channel was common in Northeast China,which was ahidden danger of channel normal operation. The regularity of moisture migration was an important topic in the study of frost heave. One-dimensional frost moisture migration modelwas established according to the channel soil Jian She farm in Bei＇An bureau,Orthogonal test with factors of freezing temperature,initial water content and dry density is completed. Experiment results showed that：water transferredbetween the freezing regionswas obvious.The water accumulation appearedmostly at the freezing front. The water migration increased with the increase of soil initial water content,but decreased with the increase of freezing temperature. Soil dry density had little effect on the moisture transfer under this experiment condition.