工程地质学报2025，Vol.33Issue(3)：866-874,9.DOI:10.13544/j.cnki.jeg.2023-0193
减围压路径下中溶盐对结构性黄土强度的影响分析
ANALYSIS OF THE INFLUENCE OF MODERATELY DISSOLVED SALTS ON THE STRENGTH OF STRUCTURAL LOESS UNDER THE PATH OF RE-DUCING CONFINING PRESSURE
摘要
Abstract
To study the effect of salt content on the strength of structural loess under specific stress paths,this pa-per conducted soil pressure reduction triaxial(RTC)tests and microscopic electron microscopy tests(SEM)on undis-turbed loess with different salt contents(0,0.1％,0.2％和 0.5％).By analyzing the changes in micro pore struc-ture and the stress-strain curve of triaxial tests,the strength variation law of structural loess was studied.The results indicate that the content of medium soluble salt will have a certain impact on the internal structural redistribution of structural loess soil.When the confining pressure is low,the time required for the confining pressure to decrease to 0 is relatively short,and the stress-strain curve only shows an upward trend.However,under the confining pressure conditions of 100 kPa and 200 kPa,the sample exhibits strain softening characteristics.When reaching a medium to high confining pressure of 400 kPa,the sample exhibits strain hardening,and the softening effect gradually weakens with the increase of salt content.Based on the binary medium theory,the strength criterion for structural loess has been revised,and a structural loess strength criterion suitable for the effect of dissolved salt content under the re-duced confining pressure path has been proposed.关键词
结构性黄土/减围压三轴试验/中溶盐/二元介质/强度准则Key words
Structural loess/Confining pressure reduction triaxial shear test/Moderately soluble salt/Binary me-dium/Strength criterion分类
天文与地球科学引用本文复制引用
郅彬,王尚杰,王成,李睿妮,白鹤..减围压路径下中溶盐对结构性黄土强度的影响分析[J].工程地质学报,2025,33(3):866-874,9.基金项目
西安市岩土与地下工程重点实验室项目(资助号:XKLGUEKF21-03).This research is supported by Xi'an Key Laboratory of Geotechnical and Underground Engineering(Grant No.XKLGUEKF21-03). （资助号:XKLGUEKF21-03）
