压缩过程中饱和原状和饱和重塑黄土孔隙分布变化特征

Pore Distribution Characteristics of Saturated Intact and Saturated Remolded Loess under Compression

为从微观孔隙分布角度上解释饱和原状黄土与饱和重塑黄土在相同应力状态下宏观变形的差异、在相近孔隙比下孔隙分布的差异以及所经历应力路径的差异,针对这二个目的,对泾阳崔师饱和原状黄土和饱和重塑黄土进行一维压缩和等向压缩试验并进行相同应力状态及相近孔隙比下的压汞试验。研究结果表明:泾阳崔师黄土孔隙分布呈三峰分布,重塑黄土孔隙分布呈两峰分布;相同应力状态下,两者粒间孔隙差异大而粒内孔隙基本相同,随着压力的增加,两者粒间孔隙逐渐相近,宏观变形的差异体现在粒间孔隙的差异;相近孔隙比下,二者孔隙分布差异不大但经历的应力路径差异很大。

This study analyzes differences in macro-deformation between saturated intact loess and saturated remolded loess under the same stress state from the perspective of micro-pore distribution.Moreover,the study analyzes differences in the micro-pore size distribution between saturated intact loess and saturated remolded loess in a similar void ratio.Mercury intrusion tests are conducted on saturated intact and remolded loess in Cuishi village,Jingyang county,after one-dimensional and isotropic compression under the state of same stress and a similar void ratio.Results show that(1)The pore distribution of Jingyang intact loess has three peaks while that of remolded loess has two peaks.Moreover,there are differences in the highest peak changes in the remolded loess as compared with that of the intact loess.(2)Under the same stress state,the volume of intra-particle pores is similar in both loess samples but that of the interparticle pores is different.With an increase in stress,the volume of interparticle pores of both specimens becomes more similar,and differences in the macro-deformation are reflected in the differences between the interparticle pores.(3)Under a similar void ratio state,the pore distribution of the two loess samples are similar,but their stress paths are considerably different.