岩土工程学报2024，Vol.46Issue(4)：814-822,9.DOI:10.11779/CJGE20221559
非饱和盐渍黏土物理化学作用的应力依赖特性
Stress-dependent properties of physicochemical interaction of unsaturated saline clay
摘要
Abstract
To reveal the impact of physicochemical effects on the compressive behaviors of unsaturated clay containing salt solution and its dependence properties on stress level,one-dimensional compression tests are performed on the specimens with pores containing distilled water,sodium chloride solution,sodium sulfate solution and controlled matric suction conditions.Then,the compression index,secondary compression coefficient and yield stress of clay under different conditions are measured according to the test results,and their variation laws with the matric suction and osmotic suction are calibrated.Furthermore,the stress-dependent characteristics of physicochemical action are clarified through an in-depth analysis of the primary and secondary consolidation behaviors of unsaturated saline clay under different matric suctions and osmotic suctions,and the LC yielding behaviors of unsaturated saline clay are explored.The results show that the ratio of the secondary compression coefficient to the compression index C a/Cc and the yield stress of unsaturated saline clay at different physicochemical forces can be described uniformly using the osmotic suction and matric suction.From the slope of compression curve in the plastic loading zone and the correlation between characteristic parameter,C a/Cc and the vertical stress,it is noted that the physicochemical action of unsaturated saline clay is closely related to the stress level.Moreover,the LC yield curve of unsaturated saline clay is a smooth curve composed of MLC yield curve and OLC yield curve under chemo-hydro-mechanical coupling.关键词
非饱和黏土/孔隙盐溶液/物理化学作用/应力依赖性/LC屈服行为Key words
unsaturated clay/pore salt solution/physicochemical action/stress dependence/LC yield behavior分类
建筑与水利引用本文复制引用
王立业,周凤玺,周立增,梁玉旺..非饱和盐渍黏土物理化学作用的应力依赖特性[J].岩土工程学报,2024,46(4):814-822,9.基金项目
国家自然科学基金项目(11962016,51978320) （11962016,51978320）
甘肃省基础研究创新群体项目(20JR5RA478) （20JR5RA478）
甘肃省教育厅:优秀研究生"创新之星"项目(2022CXZX-451) （2022CXZX-451）
