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冰川冻土  2013 

高温-高含冰量冻土压缩变形特性研究

DOI: 10.7522/j.issn.1000-0240.2013.0044, PP. 369-375

Keywords: 高温-高含冰量冻土,体积压缩系数,未冻水含量,渗滤变形

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Abstract:

高温-高含冰量冻土属于塑性冻土,荷载作用下具有较强的压缩性.为了研究高温-高含冰量冻土的压缩变形特性,采用恒温-变载的试验方法得到了不同温度(-0.3、-0.5、-0.7、-1.0、-1.5℃),不同含水量(40%、80%、120%)条件下冻土试样的体积压缩系数.结果表明1)高温-高含冰量冻土具有极大的压缩性,青藏黏土40%含水量试样在-0.3℃时的体积压缩系数可达0.328MPa-1,属于高压缩性土;2)高温-高含冰量冻土在压缩过程中存在渗滤变形,且主要发生于加载的初始阶段;3)温度与含冰量是影响高温-高含冰量冻土压缩性的主要因素,它们决定了冻土中体积未冻水的含量,从而控制了冻土的压缩性;4)在试验条件下,高温-高含冰量冻土的压缩性随着温度的升高而增大,随着含水量的增大而减小.高温时含水量对压缩性的影响比较显著,低温时影响较小.

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