岩土力学2024，Vol.45Issue(2)：353-363,374,12.DOI:10.16285/j.rsm.2023.0307
单、双孔隙结构非饱和黏土孔隙分布变化规律试验研究
Experimental study on the variation pattern of pore size distributions for unsaturated clay with single or double pore structure
摘要
Abstract
Due to the complexity of the pore size distribution(PSD),the variation pattern of the pore structure for clay during the drying process is not clear,which leads to an inaccurate calculation of the soil-water characteristic curve(SWCC)based on the pore distribution model.To address this issue,a study was conducted to quantitatively analyze the PSD of remodeled clay with the single or double pore structure during the drying process based on the shrinkage test and mercury intrusion porosimetry test.The results revealed that there were translational and scaling transformations of the PSDs during the drying process.The t-distribution and double t-distribution functions were proposed to describe the PSDs of clay.The degrees of freedom,the peaks and the pore diameters corresponding to the PSD peaks were extracted as characteristic parameters to characterize the variation of PSDs.Good linear relationships between the characteristic parameters and the void ratio of remodeled clay were observed.Based on these findings,the relationship of water content-void ratio-pore size distribution was further established,and a framework for calculating the SWCC of remolded clay considering the variation of pore structure was proposed.Finally,the accuracy of the proposed calculation method was verified by comparing with the experimentally measured SWCC.关键词
黏土/非饱和土/孔隙分布曲线/压汞试验/土-水特征曲线/干缩试验Key words
clay/unsaturated soil/pore size distribution/mercury intrusion porosimetry test/soil-water characteristic curve/shrinkage test分类
建筑与水利引用本文复制引用
张思奇,裴华富,谭道远,朱鸿鹄..单、双孔隙结构非饱和黏土孔隙分布变化规律试验研究[J].岩土力学,2024,45(2):353-363,374,12.基金项目
国家自然科学基金(No.52122805,No.52078103).This work was supported by the National Natural Science Foundation of China(52122805,52078103). （No.52122805,No.52078103）
