To examine the pore-size distribution (PSD) evolution of intact, compacted, and saturated loess during deformation associated with consolidation or shearing, nominally identical specimens were consolidated to different confining stresses or sheared to sequential axial strains under the same confining stress, and the PSD of each deformed specimen was characterized using the Mercury intrusion porosimetry (MIP) technique. The results show that the PSD evolution during consolidation is similar to that during shearing, suggesting that the PSD evolution depends mainly on whether the soil volume contracts or expands. The volumetric contraction results mainly from compression of interaggregate pores, and the intra-aggregate PSD or intra-aggregate pores are not affected. In compacted and saturated loess, interaggregate pores are compressed from the larger to the smaller, while in intact loess, the PSD evolution depends on whether the soil yields. This difference arises from different cementations that dominate particle associating in three soils. In intact loess, carbonate cementations that can be damaged by remolding and loading contribute greatly to particle associating. As a result, the stability of a pore is controlled not only by its size but also by carbonate cementations at surrounding particle contacts. Clay cementations that play the dominant role in particle aggregating in compacted loess are resistant to loading; thus, aggregates could not be destroyed by loading and the mechanical responses of compacted loess are in fact interactions among aggregates. Both carbonate and clay cementations can fail under the combined effect of loading and inundation, leading to disintegration of aggregates and turning of the loess structure from the double-structured to the uniform type.

中文翻译：

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黄土在固结和剪切过程中完整，压实和饱和黄土的孔尺寸分布演变

为了检查完整，压实和饱和黄土在与固结或剪切相关的变形过程中孔尺寸分布（PSD）的演变，名义上相同的标本被固结到不同的约束应力或在相同的约束应力下剪切成顺序的轴向应变，并且使用水银压入孔隙率法（MIP）技术对每个变形样品的PSD进行了表征。结果表明，固结过程中的PSD演化与剪切过程中的相似，表明PSD演化主要取决于土壤体积是收缩还是扩张。体积收缩主要是由聚集间孔的压缩引起的，聚集内PSD或聚集内孔不受影响。在压实和饱和的黄土中，聚集的孔隙从大到小被压缩，而在完整的黄土中，PSD的演变取决于土壤的产量。这种差异是由于在三种土壤中支配颗粒结合的胶结作用不同而引起的。在完整的黄土中，碳酸盐胶结物可能会因重塑和负载而受损，从而极大地促进了颗粒的缔合。结果，不仅通过孔的大小而且通过周围颗粒接触处的碳酸盐胶结来控制孔的稳定性。在压实黄土的颗粒聚集中起主要作用的粘土胶结物耐荷载。因此，骨料不能被载荷破坏，而压实黄土的机械响应实际上是骨料之间的相互作用。