冻结作用对土壤电阻率的影响研究

Influence of Soil Resistivity Affected by Freezing

周期性冻结作用对路基土体损伤很大,因此有必要了解冻结作用对土体的影响机制,为今后工程中判断冻结作用导致的土体损伤作参考。而电阻率作为一种可以快速测量且较为精确的中间量,很适合用于探究冻结作用对土体的影响。试验中对土样变形和电阻率进行了全过程监控,通过对比冻结过程中土体电阻率和变形后发现,土样在封闭条件下变形甚微,且不同压实度电阻率变化情况不尽相同,不同冻结温度作用下土样电阻率最大变化量与冻结温度呈线性变化关系。

The frequent freeze-thaw cycleshave a significantly adverse impact on the engineering performance on the soil subgrade,therefore,it is necessary to understand the soil behaviors under the freeze thaw cycles for the future projects.The soil resistivity,as an intermediate quantity,can be quickly measured,which means it may be suitable for the index properties of soil performance under permafrost conditions.In this study,soil samples were experienced seven(7)freeze-thaw cycles.The resistivity and deformation of soil samples were measured in the entire process to establish relationships among various parameters It can be concluded that,after measuring the resistivity during freeze,the sample deformedonly slightly under the closed condition.Different sample of degrees of compaction haveresulted in different resistivity values.The maximum variation of sample resistivity changes linearly with temperature under the frizzed conditions.