长江科学院院报2024，Vol.41Issue(4)：124-130,139,8.DOI:10.11988/ckyyb.20221440
非饱和重塑弱膨胀土微观孔结构特征与水力迂曲度研究
Microscopic Pore Structure Characteristics and Hydraulic Tortuosity of Unsaturated Remodeled Weakly Expansive Soil
摘要
Abstract
To investigate the variation in pore distribution of remodeled weakly expansive soil at different dry densi-ties,specimens with dry densities of 1.40,1.50,1.60,1.70,1.80 g/cm3 were prepared using a press sample ma-chine.The pore structure and distribution characteristics of these specimens were analyzed through mercury-injec-tion and saturation-permeability tests.The hydraulic tortuosity of the specimens were calculated based on mercury piezometric and saturation permeability tests.The results indicate a consistent pattern in the process of mercury en-tering and exiting specimens of varying dry densities.Due to distinct entry and exit paths and the presence of bottle-neck pores,the mercury retains within the specimens.Furthermore,an increase in dry density results in a reduction in both pore volume and the quantity of large pores.The soil's pore structure becomes more intricate with higher dry densities,exhibiting a negative correlation between average pore diameter,porosity,total pore volume,and fractal dimension.Based on the experimental outcomes,saturated permeability coefficients and hydraulic tortuosity at varied dry densities were computed,revealing that the increase in hydraulic tortuosity with higher dry density lies in the changes in pore size and structure,consequently affecting the fluid's permeation ability within the soil.关键词
膨胀土/压汞法/微观结构/饱和渗透系数/水力迂曲度Key words
expansive soil/mercury piezometric method/microstructure/saturated permeability coefficient/hy-draulic tortuosity分类
建筑与水利引用本文复制引用
蔺文博,宁贵霞,马丽娜,丁小刚,张扬,罗伟..非饱和重塑弱膨胀土微观孔结构特征与水力迂曲度研究[J].长江科学院院报,2024,41(4):124-130,139,8.基金项目
甘肃省教育厅产业支撑计划项目(2021CYZC-28) （2021CYZC-28）
甘肃省教育科技创新项目(2022A-136) （2022A-136）
长江学者和创新团队发展计划滚动支持项目(IRT-15R29) （IRT-15R29）
