防灾减灾工程学报2024，Vol.44Issue(2)：467-477,11.DOI:10.13409/j.cnki.jdpme.20220928003
藏东南冰碛体剪切特性受冻融循环的影响及改良
Influence of Freeze-Thaw Cycles on Shear Characteristics of Moraines in Southeastern Tibet and Their Improvement
摘要
Abstract
Moraine deposits,which are widely distributed in southeastern Tibet,pose significant risks to engineering projects.In order to study and improve their shear performance,well-graded similar materials replicating moraines were prepared using the principle of similarity.Under different freeze-thaw cycles and moisture content conditions,direct shear tests were conducted on these similar materi-als.Triaxial tests were conducted with the addition of engine oil and fly ash admixtures to study their impact on the shear strength parameters of the moraine-like materials.The results showed that:(1)In direct shear tests,with the increase of vertical pressure,the displacement-shear stress curve of mo-raines changed from a weak strain softening type to a weak strain hardening type.(2)The influence of moisture content on moraines'shear strength was affected by the number of freeze-thaw cycles.(3)Af-ter five freeze-thaw cycles,the material reached a threshold in shear strength.(4)Engine oil and fly ash had opposite effects on the shear strength indices(cohesion and internal friction angle)of the mo-raines.关键词
冰碛体/相似材料/冻融循环/剪切特性/改良Key words
moraine/similar materials/freeze-thaw cycles/shear performance/improvement分类
建筑与水利引用本文复制引用
陈志敏,刘宝莉,李宁,李江鹏..藏东南冰碛体剪切特性受冻融循环的影响及改良[J].防灾减灾工程学报,2024,44(2):467-477,11.基金项目
国家自然科学基金项目(12262018)资助 （12262018）
