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为研究冻土电阻率与温度的关系,采用自制电阻测量装置,对不同温度的砂土和黏土试样进行了电阻测试。结果表明,当温度大于0℃时,土的电阻率变化不大;当温度小于0℃时,土的电阻率随温度的下降而明显上升。出现这种现象的原因在于,当温度降低至0℃以下时,土中水分随温度的降低将逐渐部分或全部冻结为冰,而冰的电阻率大于液态水的电阻率。此外,冻土的电阻率还与土的类型有关,在干密度、含水量、温度均相同的条件下,砂土的电阻率大于黏土的电阻率。
In order to study the relationship between the resistivity of the frozen soil and the temperature, a resistance measuring device was used to measure the resistance of sand and clay samples with different temperatures. The results show that when the temperature is higher than 0 ℃, the resistivity of soil does not change much. When the temperature is less than 0 ℃, the resistivity of soil increases obviously with the decrease of temperature. The reason for this phenomenon is that when the temperature drops below 0 ° C, the moisture in the soil will gradually or totally freeze to ice as the temperature decreases, whereas the resistivity of ice is greater than the resistivity of liquid water. In addition, the resistivity of frozen soil is also related to the type of soil. Under the same dry density, water content and temperature, the resistivity of sand is greater than the resistivity of clay.