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OALib Journal期刊
ISSN: 2333-9721
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土体单向冻结对土中水分迁移的影响
DOI: 10.3969/j.issn.1000-2006.2013.01.021, PP. 117-121
Keywords: 土质,单向冻结,水分迁移,含水率,干密度
Abstract:
以江苏南京、苏州、无锡等地区典型的浅表土为研究对象,对非饱和土进行了单向冻结试验,研究了不同含水率、干密度以及冻结时间对土中水分迁移特性的影响。结果表明:试样冻结锋面的位置与冻结时间有关,冻结2h后的发展速度(1.20cm/h)略小于前2h的发展速度(1.55cm/h);土中水分迁移量及迁移范围与干密度成反比,试样顶端含水率减小值及底端含水率增加值与干密度大小有关;处于非饱和状态的淤泥质黏土初始含水率越大,经单向冻结后造成的水分迁移效果越明显;粉砂中易形成快速冻结,初始含水率对水分迁移能力影响不大;相同冻结条件下淤泥质粉质黏土冻结后各冻土段含水率增量基本相同。
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