Abstract

This work analyses the macroscopic definition of Bishop’s χ function for double porosity soils by imposing the thermodynamic consistency of the constitutive stress derived from that function. The analysis presented demonstrates that, under the assumption of equilibrium between macrostructural and microstructural water, χ should be understood, from a thermodynamic perspective, as a correction of the macrostructural suction that enables an accurate definition of the increase in Helmholtz free energy in the soil when using the constitutive stress to compute the strain work. For the low salinity conditions assumed, the proposed functional structure establishes a broad model framework that can accommodate developments tailored to different materials and test conditions.

中文翻译：

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双孔隙土中 Bishop χ 函数的宏观定义

摘要

这项工作通过强加从该函数导出的本构应力的热力学一致性，分析了双孔隙土的 Bishop χ函数的宏观定义。分析表明，在宏观结构水和微观结构水之间达到平衡的假设下，从热力学角度来看， χ应该被理解为宏观结构吸力的校正，从而能够准确定义土壤中亥姆霍兹自由能的增加，当使用本构应力来计算应变功。对于假设的低盐度条件，所提出的功能结构建立了一个广泛的模型框架，可以适应针对不同材料和测试条件定制的开发。