长江科学院院报2019，Vol.36Issue(4)：145-150,6.DOI:10.11988/ckyyb.20180917
微观结构对膨胀土土-水特征曲线的影响
Influence of Microstructure on Soil-Water Characteristic Curve of Undisturbed Expansive Soils
摘要
Abstract
The water retention characteristics of Nanyang undisturbed weak expansive soil were tested using the os-motic technique and the vapor phase technique. The hydrating path of soil-water characteristic curve ( SWCC) in the suction ranging from 0.01 to 309 MPa was gained and fitted according to a model proposed by Van Genuchten. Scanning Eelectron Microscope (SEM) and Mercury Intrusion Porosimetry ( MIP) tests were conducted to analyse the influence of microstructure modification on SWCC. Results showed that during hydrating process, the volume content of micro-pore and macro-pore increased while that of fine-pore decreased. Changes in micro-pore and fine-pore resulted in the continuous absorption of water by soils with no inflection point on the SWCC. The increase of macro-pore mainly influences the boundary effect segment of SWCC, but such influence is slight.关键词
膨胀土/持水特征/微观结构/孔隙分布/吸湿路径/土-水特征曲线Key words
expansive soil/ water retention characteristics/ microstructure/ pore size distribution/ hydrating path/SWCC分类
建筑与水利引用本文复制引用
齐道坤,潘燕敏,张亮..微观结构对膨胀土土-水特征曲线的影响[J].长江科学院院报,2019,36(4):145-150,6.基金项目
国网河南电网项目(5217L0160001) （5217L0160001）
