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在实验室对北京壤质粘土犁底层原状土柱进行模拟冻融处理,观测冻融对其容重、孔隙度、导水率的影响.研究结果表明,冻融处理后犁底层容重降低3.5%～9.3%,孔隙度增大6.1%～16.3%,饱和导水率提高1.4～7.7倍.冻融土容重变化与冻土温度和土壤含水率的关系密切.
The effect of freeze-thaw on the bulk density, porosity and hydraulic conductivity of the plow was simulated in the laboratory at the bottom of loam plow in Beijing.The results showed that the bulk density of plow bottom decreased 3.5% 9.3%, the porosity increased by 6.1% ~ 16.3%, and the saturated hydraulic conductivity increased by 1.4 ~ 7.7 times.The change of bulk density of frozen-thawed soil was closely related to the temperature of permafrost and the moisture content of soil.