自由膨胀率是人工制备的烘干、碾细的土试样，在水中膨胀增加的体积与原始体积之比，以百分率表示。它说明土粒在无结构力影响下的膨胀特性，主要受土中粘粒含量和矿物成分支配。粘粒含量愈高，矿物亲水性愈强，自由膨胀率愈大。
南水北调与水利科技__期刊 关键词：水泥改性；膨胀土；最大干密度；自由膨胀率 [gap=1279]Key words: Cement-treated; Expansive soil; Maximum dry density; Free swelling ratio
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... cross swell 横向海浪 free swell 自由膨胀率 ground swell 地隆;岸浪(飓风或地震引起的),长涌,激涌 ...
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... Darcy’s law，达西定律 degree of consolidation，固结度 degree of free swelling，自由膨胀率 ...
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自由膨胀率试验 Free swelling rate test
自由膨胀率是反映黏性土的膨胀性的指标之一，对判别膨胀土有较大参考价值。
Free swell is one of indexes in representing the expansibility of clayey soil and makes great valuable reference in the judgment of expansive soil.
试验结果表明：1）相比于未改性土，粉煤灰改性土和石灰改性土自由膨胀率、塑性指数、胶粒含量都显著降低；
The test results indicate that: 1) Compared with unmodified soils, the free swelling ratio, plastic index and clay fraction of fly ash-treated soils and Lime-treated soils decrease obviously.
本文运用模糊数学的方法对膨胀土的膨胀力、自由膨胀率、液限、塑性指数4项指标综合评价，建立模糊识别分类方法。
This article use fuzzy mathematics to appraise 4 indexs include expansion force, free expansion ration, liquid limit, plastic limit and establish a fuzzy method to judge the swell-shrink grade.
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