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科学通报  2011 

考虑温度影响的非饱和土变形特性

, PP. 1487-1496

Keywords: 非饱和土,温度影响,变形特性,本构模型

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Abstract:

随着高放核废物地下处置库建设、地热资源开发利用、节能建筑以及二氧化碳地下封存等一批现代岩土工程的发展,使得温度对非饱和土基本力学特性影响的研究成为当前国际上研究的热点问题.利用非饱和土中功的表达式,并考虑温度对非饱和土基本性质的影响,选取平均土骨架应力、修正吸力及温度作为热力学中广义力的状态变量,选取土骨架应变、饱和度及熵作为与广义力变量共轭的广义流状态变量.基于土体非线性多场耦合模型理论框架,利用现有的实验研究成果,提出了一个非等温条件下非饱和土弹塑性本构模型,对温度影响下的非饱和土变形特性进行了分析.应用所建立的模型,在各向同性条件下就吸力和温度对非饱和土变形性质的影响进行了预测和分析,并与已有的实验结果进行了比较.比较结果表明了所提模型的合理性.

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