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自由膨胀率是膨胀土分类判别的重要指标之一,室内自由膨胀率试验周期长、影响因素多,试验成果重复性较差。自由膨胀率和土壤电导率均与土壤的阳离子交换量、比表面积密切相关,在土壤的含水率一定的条件下,电导率是一个相对稳定的指标。因此,探索用电导率测定膨胀土的自由膨胀率可以解决自由膨胀率试验困难的问题。采用制备一定含水率条件下的膨胀土样测试了其电导率和自由膨胀率,试验成果表明:土壤电导率的量级可以用来反映膨胀土的膨胀等级。用特定含水率条件下膨胀土样的电导率可以推求土样的自由膨胀率。该成果对于研究采用电导率判别膨胀土的膨胀等级具有重要的实用意义。
The free expansion rate is one of the important indexes for the classification of expansive soil. The indoor free expansion rate test period is long, with many influencing factors, and the test results have poor repeatability. Free expansion and soil conductivity are closely related to the cation exchange capacity and specific surface area of the soil. Under the condition of certain soil moisture content, the conductivity is a relatively stable index. Therefore, to explore the free expansion of expansive soils with conductivity can solve the problem of free expansion test difficult. The conductivity and free expansion of the expansive soil samples were tested under a certain moisture content. The results show that the magnitude of the soil conductivity can be used to reflect the expansive grade of expansive soils. With the specific moisture content of expansive soil conductivity can infer the soil sample free expansion. The results have important practical significance for the study of the conductivity of expansive soil to determine the degree of expansion.