摘要
研究防冻剂种类(尿素、氯化钙和复合型防冻剂)及掺量、冻融作用对隔离屏障渗透系数的影响,并从微观层次揭示其作用机理。结果表明:冻融作用使隔离屏障的渗透系数增大两个数量级,随冻融循环次数的增加渗透系数逐渐增大;防冻剂可使冻融作用下隔离屏障的渗透系数降低,而随着防冻剂掺量的增加渗透系数反而增大。添加1%尿素或复合型防冻剂隔离屏障经3次冻融循环后的渗透系数与未进行冻融循环的渗透系数相接近,防冻效果最好。孔隙结构的变化趋势与渗透系数的变化趋势相一致。
The influence of antifreeze type(urea,calcium chloride and compound antifreeze)and its dosage and freeze-thaw action on the permeability coefficient of isolation barrier was studied,and its mechanism was revealed from the micro level.The results show that the permeability coefficient of the barrier increases by two orders of magnitude due to freeze-thaw action and increases gradually with the increase of freeze-thaw cycles.Antifreeze reduces the permeability coefficient of the barrier under freezing and thawing,but increases it with the increase of antifreeze content.The permeability coefficient of the barrier with 1%urea or compound antifreeze after 3 freeze-thaw cycles is close to that without the freeze-thaw cycles,and the antifreeze effect is the best.The change trend of pore structure is consistent with that of permeability coefficient.
作者
宋向阳
刘霖
刘科
SONG Xiangyang;LIU Lin;LIU Ke(School of Civil Engineering,Inner Mongolia University of Technology,Hohhot 010051,China;The Inner Mongolia Key Laboratory of Civil Engineering Structure and Mechanics,Hohhot 010051,China)
出处
《内蒙古工业大学学报（自然科学版）》
2022年第6期556-562,共7页
Journal of Inner Mongolia University of Technology：Natural Science Edition
基金
内蒙古自然科学基金项目(2019MS05059)。
关键词
土-膨润土
防冻剂
冻融循环
渗透系数
孔隙结构
soil-bentonite
antifreeze
freeze-thaw cycle
permeability coefficient
pore structure
