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孔隙度是能够部分反映颗粒材料微观结构的一个宏观量,其数值及其演化对颗粒材料的宏观力学行为有重要影响。基于连续介质模型,在颗粒体积应变均匀的前提下推导了颗粒材料的孔隙度随颗粒集合局部平均体积应变的演化公式,并应用该关系式结合孔隙水状态方程给出了饱和颗粒材料的孔隙水压力与孔隙度、固体颗粒体积模量、固体颗粒变形之间的关系。所得公式可用于饱和含液颗粒材料流–固耦合计算或饱和多孔介质宏观–细观多尺度流–固耦合渗流分析。
Porosity is a macroscopic quantity that can partially reflect the microstructure of granular materials. The numerical value and its evolution have an important influence on the macroscopic mechanical behavior of granular materials. Based on the continuum model, the evolution of the porosity of a granular material as a function of the local average volumetric strain of the particle assembly is derived under the assumption that the volumetric strain of the particle is uniform. The pore water state equation of the pore water is used to calculate the pore volume of the saturated particulate material Pressure and porosity, solid particle bulk modulus, the relationship between solid particle deformation. The obtained formula can be used to calculate the fluid-solid coupling of saturated liquid-containing granular materials or macroscopic-mesoscopic multiscale flow-solid coupling seepage analysis of saturated porous media.