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结合工程实践，通过对南阳膨胀土特性研究，尤其是对２∶８ 灰土垫层和原状膨胀土做了对比试验，并探讨了膨胀土掺石灰对土的工程特性的影响机制。
Based on the engineering practice, a comparative experiment was conducted on the characteristics of expansive soil in Nanyang, especially for the 2:8 ash soil cushion and the original expansive soil. The influencing mechanism of lime mixed with expansive soil on the engineering properties of soil was discussed.