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基于广义吸力的非饱和土强度理论

, PP. 46-51

Keywords: 道路工程,广义吸力,剪切强度,非饱和土,Mohr-Coulomb破坏包线

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Abstract:

基于非饱和土的剪切强度是由于可变吸力和表观凝聚力折减之后构成,其可变吸力对强度的贡献不仅取决于吸力的大小,还取决于土粒接触点处孔隙水面积,是粒间作用力和作用面积动态变化的结果。分析结果表明表观凝聚力对强度的贡献与饱和度的变化路径相关,随着饱和度的增加,表观凝聚力对强度的贡献逐渐减小,当土体达到饱和时,表观凝聚力对土体强度的贡献变为零。如果饱和度是减小,表观凝聚力对强度的贡献保持不变或稍有增加,直到饱和度为零的时候,表观凝聚力对强度的贡献达到最大值。因此,从广义吸力的理论出发,根据两者对强度的贡献,可以建立更为合理的非饱和土强度理论。

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