Abstract The pore structure governs the physical and mechanical behaviours of geomaterials, thereby affecting the stability of the infrastructures built on these materials. This study investigated the effects of remoulding and wetting-drying-freezing-thawing (W D F T) cycles on the pore structures of two Yanji mudstones using scanning electronic microscopy (SEM), mercury intrusion porosimetry (MIP) and nitrogen adsorption (NA) techniques. The results show that the pores of both the yellow-brown and magenta mudstones become rounder and more disordered after remoulding. Remoulding leads to an increase in the inter-aggregate pore volume and a decrease in the intra-aggregate pore volume because of the exposure of intra-aggregate pores after crushing and the compaction of aggregates during the compression process. The W-D-F-T cycles make the pores of the remoulded yellow-brown mudstone more disordered and flatter and induce an increase in the inter-aggregate pore volume due to the formation of cracks and large pores. Meanwhile, the intra-aggregate pore volume decreases owing to the contraction of aggregates during the drying process. According to the increased inter-aggregate pore volume and decreased intra-aggregate pore volume, an increase in the hydraulic conductivity and a decrease in the shear strength can be expected after remoulding and W-D-F-T cycles, which decrease the stability of mudstone slopes.

中文翻译：

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重塑和干湿冻融循环对延吉泥岩孔隙结构的影响

摘要 孔隙结构控制着岩土材料的物理和力学行为，从而影响在这些材料上建造的基础设施的稳定性。本研究采用扫描电子显微镜 (SEM)、压汞孔隙率 (MIP) 和氮吸附 (NA) 技术研究了重塑和湿-干-冻-融 (WDFT) 循环对两个延吉泥岩孔隙结构的影响。结果表明，改造后黄褐色和品红色泥岩的孔隙均变得更圆、更无序。由于破碎后聚集体内孔隙暴露和压缩过程中聚集体的压实，重塑导致聚集体间孔体积增加和聚集体内孔体积减小。 . . . ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? WDFT 循环使改造后的黄褐色泥岩孔隙更加无序和平坦，由于裂缝和大孔隙的形成，导致集料间孔隙体积增加。同时，由于干燥过程中聚集体的收缩，聚集体内的孔隙体积减小。根据集料间孔隙体积的增加和集料内孔隙体积的减小，预计在改造和WDFT循环后导水率增加，剪切强度降低，从而降低泥岩边坡的稳定性。由于干燥过程中聚集体的收缩，聚集体内的孔隙体积减少。根据集料间孔隙体积的增加和集料内孔隙体积的减小，预计在改造和WDFT循环后导水率增加，剪切强度降低，从而降低泥岩边坡的稳定性。由于干燥过程中聚集体的收缩，聚集体内的孔隙体积减少。根据集料间孔隙体积的增加和集料内孔隙体积的减小，预计在改造和WDFT循环后导水率增加，剪切强度降低，从而降低泥岩边坡的稳定性。