研究目的:如何划分膨胀土和非膨胀土，目前国内尚无统一的指标和方法，针对不同地区和不同膨胀等 级的膨胀土，采用和自由膨胀率试验相同的烘干试样进行吸湿含水率研究，给出相应的试验方法。提出用烘 干土吸湿含水率反映土的膨胀特性，克服自由膨胀率试验结果离散大的缺点，探寻判定膨胀土和非膨胀土的 界限值。
研究结论:给出用烘干土测试吸湿含水率的试验方法;试验方法操作过程简单，有利于工程勘察过程中大 量开展。试验结果表明吸湿含水率与蒙脱石含量、阳离子交换量有良好的线性关系，与自由膨胀率亦有较好 的线性关系，可以作为膨胀土判定的研究方向，对膨胀潜势的判定也有很好的研究价值。
Research purposes: At present, there are not unified criteria and methods in China to distinguish between expansive soil and non-expansive soil. The research studies moisture absorption water content of expansive soil of different grades from different regions by testing on the same oven-fried soil samples used in free swelling ratio experiments, and the corresponding testing methods are provided. The paper suggests determining the expansive properties of soil by moisture absorption water content of oven-fried soil, which overcomes the discreteness of free swelling ratio experiment results, and it also tries to probe for the boundary value for the identification of expansive and non-expansive soil.
Research conclusions: The given methods of testing moisture absorption water content of oven-fried soil are easy to operate and practicable to be extensively adopted in construction surveying. The results of the test indicate that there is good linear relationship between moisture absorption water content of soil and montmorillonite content, canon exchange capacity or free swelling ratio. Therefore, it can be adopted as a direction of research on ways of identifying expansive soil, and it also has great value for research on determining the expansive potential of expansive soil.
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