自由膨胀比指标评价改良膨胀土的膨胀性

针对自由膨胀率试验中存在的不足以及改良膨胀土膨胀性评价的难点,引入自由膨胀比指标用于掺灰改良膨胀土的膨胀性评价。试验研究表明:自由膨胀比指标与改良膨胀土的基本物理力学性质指标(包括颗粒分布、界限含水率等)以及常用的膨胀土胀缩性指标(包括自由膨胀率、膨胀量、膨胀力与线缩率)间存在良好的线性相关关系。自由膨胀比方法具有操作相对简单,可靠性好等优点,对实际工程的预测结果与实测结果基本一致。利用自由膨胀比指标可以有效进行改良膨胀土膨胀性强弱的预测评价,具有重要的理论意义和应用价值。

Evaluation of swelling capacity of stabilized expansive soils using free swell ratio method

With regard to the problems in the free swell experiments and the evaluation of stabilized expansive soils,the free swell ratio method was introduced to evaluate the swelling capacity of lime and fly ash treated expansive soils.Based on the test results,the good linear relationships among the free swell ratio and the physical property parameters and the commonly used swell-shrinkage property parameters were identified.The possibility of using the free swell ratio in evaluating the swelling capacity of lime or fly ash stabilized expansive soils was shown,and its practicality had been approved through the utilization of the proposed method in practical engineering projects.