东北多年冻土区粉质黏土导热性能研究

Study on thermal conductivity of silty clay in northeast permafrost region

本文依据东北多年冻土区冻土试验,以正规状态法测定冻土样的导热系数,稳态法测定融土样的导热系数,通过二元线性回归分析。试验结果表明:导热系数随着含水量和干密度的增加而增加,液限和塑限是粉质黏土的导热性能突变界限,小于塑限的土体导热性能不受含水量影响,大于液限土体的导热系数趋近一个定值,粉质黏土的导热系数小于粗颗粒的导热系数,粉质黏土的黏土掺量和细砾石掺量可明显提高其导热系数。

According to the northeast permafrost test,the thermal conductivity of frozen soil is determined by the normal state method,and the thermal conductivity of thawing soil is determined by the steady state method,by binary regression analysis.The results show that the thermal conductivity increases with the increase of water content and dry density,the liquid limit and plastic limit are the abrupt limit of thermal conductivity of silty clay,and the thermal conductivity of soil below plastic limit is not affected by water content,the thermal conductivity of silty clay is smaller than that of coarse grain.The thermal conductivity of silty clay can be improved by adding clay and gravel.