西北地质2026，Vol.59Issue(2)：12-19,8.DOI:10.12401/j.nwg.2025099
填方区不同含水率边坡黄土蠕变特性试验研究
Experimental Study on Creep Characteristics of Loess Slopes with Different Moisture Contents in Filled Areas
摘要
Abstract
In recent years,the significant increase in land resource demands in loess gully regions has led to rapid development of fill engineering projects,accompanied by increasingly prominent landslide hazards.While altering the original topography,these projects substantially modify the stress state of soil mass,with moisture content and confining pressure fluctuations becoming critical factors affecting slope stability.This study focuses on a loess-filled slope in Tianshui City,conducting a series of triaxial creep tests under controlled moisture con-tent and confining pressure.The results demonstrate:① Increased moisture content weakens soil structure and reduces soil strength,while higher confining pressure restricts lateral deformation.② During moisture content elevation,the failure mode transitions from brittle fracture to plastic bulging(notably at 24％moisture content),with significantly increased axial compression.③ Moisture content increase elevates pore water pressure,shift-ing the Mohr circle leftward;meanwhile,long-term creep effects reduce shear strength through decreased effec-tive stress and moisture-induced cementation weakening,triggering shear failure when the Mohr circle bound-ary exceeds the new strength threshold.④ Although confining pressure enhances long-term soil strength,stress redistribution in actual projects causes shear stress concentration at the slope toe as fill height increases,ulti-mately reducing slope stability.This study systematically reveals the creep behavior,failure characteristics,and stress evolution of filled slopes under varying moisture content and confining pressure conditions,providing ex-perimental references and theoretical foundations for stability control in loess-filled engineering projects.关键词
含水率/黄土填方边坡/蠕变效应/破坏特征/应力变化Key words
moisture contents/loess-filled slope/creep effect/failure characteristics/variation of stresses分类
天文与地球科学引用本文复制引用
杨金水,王新刚,陆梅,叶旭光,田发国,连宝琴,刘凯..填方区不同含水率边坡黄土蠕变特性试验研究[J].西北地质,2026,59(2):12-19,8.基金项目
国家重点研发计划项目(2023YFC3008401)和陕西省自然科学基金重点项目(2024JC-ZDXM19)联合资助. （2023YFC3008401）
