赵一桐,童富果,刘〓畅,田雯菁.一种适用于非饱和粘土强度测试的脱湿固结制样方法[J].水电能源科学,2018,36(6):118-121
一种适用于非饱和粘土强度测试的脱湿固结制样方法
A Dehydration Remoulding Method for Shear Tests of Unsaturated Clay
  
DOI:
中文关键词:  非饱和粘土  土样制备  强度测试  脱湿固结  分层击实
英文关键词:unsaturated clay  specimen preparation  shear test  dehydration  compaction
基金项目:国家重点研发计划(2017YFC1501101);国家自然科学基金项目(51279090)
作者单位
赵一桐,童富果,刘〓畅,田雯菁 三峡大学 水利与环境学院 湖北 宜昌 443002 
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中文摘要:
      非饱和粘土强度测试中采用传统的击实法制备重塑土样,其试验结果通常会由于土样分层性明显、水分分布不均而与天然粘土的强度特性出入较大,甚至会得出粘聚力随土体饱和度增加而增大的错误结论。为此,基于非饱和固结原理,通过模拟自然土体的一次脱湿固结循环过程,提出了一种适用于非饱和粘土强度测试的重塑土制样方法——脱湿固结制样法,并以三峡地区粉质粘土为例,对比分析了击实重塑样、原状土样及脱湿固结样不同饱和度下的强度测试结果。结果表明,与原状土强度相差较大的击实重塑样相比,脱湿固结样不仅在强度大小上较为接近原状土,其粘聚力随饱和度变化规律也基本相似。
英文摘要:
      The traditional compaction method is usually used in laboratory shear tests to prepare remoulding specimens. However, the disturbance for unsaturated clay remoulded by this method can be so large as to render the tests results meaningless. In order to solve such technical problems, a dehydration remoulding method was introduced to readjust the water distribution in the soil and simulate the natural dehydration process. A series of shear tests on undisturbed soil, traditional remoulded specimen and improved remoulded specimen was conducted. The results show that specimens prepared by the simple compaction is much lower in strength than that of undisturbed soil. While specimens prepared by dehydration remoulding method shows the similar strength variation under different saturation degrees and similar value with undisturbed soil.
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