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文章对膨胀土石灰改良膨胀土初始含水量与干密度以及膨胀率对其加州承载比(CBR)值的影响规律,通过室内承载比试验,按照相关的试验规范的步骤进行CBR试验,分析了膨胀土和石灰改良膨胀土的CBR随着压实度变变化的基本规律。发现膨胀土的CBR值随其膨胀潜势等级、含水量、压实度变化的规律,CBR值对应的含水量大于最佳含水量,其差值随压实度的减小而减小.这些特征与膨胀土的固有膨胀特性以及膨胀潜势等级有关.膨胀土用于路堤填筑时,含水量宜按较最佳含水量稍大,并略低于塑限,干密度较最大干密度略低的标准控制,这才有利于路堤的长期稳定。
In this paper, the effect of initial soil moisture content and dry density of expansive soil on expansive soil lime and its expansion ratio on CBR value of expansive soil was studied. The CBR test was carried out according to the relevant test code through indoor bearing ratio test, The CBR of expansive soils with soil and lime improves with the compaction degree. It is found that the CBR value of expansive soil varies with its expansion potential level, water content and compaction degree, and the water content corresponding to CBR value is greater than the optimal water content, and the difference decreases with the decrease of compaction degree The characteristics are related to the inherent swelling characteristics of expansive soils and the swelling potential.When the expansive soil is used for embankment filling, the water content should be slightly larger than the best water content and slightly lower than the plastic limit, and the dry density is slightly larger than the maximum dry density Low standard control, which is conducive to the long-term stability of the embankment.