水资源与水工程学报2026，Vol.37Issue(1)：178-187,10.DOI:10.11705/j.issn.1672-643X.2026.01.20
荷载-降雨耦合作用下土石混填路基力学性能劣化机理研究
Deterioration of soil-rock embankment mechanical properties under coupled effects of traffic loading and rainfall infiltration
摘要
Abstract
The coupled effects of traffic loading and rainfall infiltration pose a great threat to the stability of embankments filled with soil-rock mixture.To reveal the failure mechanism of the embankment,we conducted a comparative analysis under both baseline and rainfall conditions,based on the typical em-bankment structure of mountain highways,using a combined approach of scaled indoor physical model tests and numerical simulations.An integrated monitoring system was deployed to analyze the evolution of moisture content,mechanical response,and deformation patterns of the embankment under static load-ing.The results indicate that rainfall infiltration reduces the ultimate bearing capacity of the embankment from 550 kPa to 450 kPa,corresponding to a reduction of 18.18%.The failure mode shifts from overall shear failure under baseline condition to localized crushing failure with no evident sliding surface,which is induced by fine particle migration and increased pore water pressure under rainfall condition.Both soil pressure and settlement distributions exhibit significant spatial heterogeneity,with pronounced boundary constraint effects.Based on these findings,it is recommended that embankment design in rainy regions should incorporate a bearing capacity reduction coefficient of 18%-20%,and implement real-time mois-ture monitoring at critical sections.Furthermore,to avoid fine particle loss and enhance water stability,the proportion of aggregates larger than 40 mm should be controlled within 55%-60%for the establish-ment of a stable rock structure.The outcomes of this study can provide quantitative references for the de-sign and disaster prevention of soil-rock embankments.关键词
土石混填路基/荷载-降雨耦合/模型试验/承载力折减/破坏机理/力学响应Key words
soil-rock embankment/load-rainfall coupling/physical model test/bearing capacity re-duction/failure mechanism/mechanical response分类
建筑与水利引用本文复制引用
马丽娜,张永伟,黎世平,王志强..荷载-降雨耦合作用下土石混填路基力学性能劣化机理研究[J].水资源与水工程学报,2026,37(1):178-187,10.基金项目
国家自然科学基金铁路联合基金项目(U2368209) （U2368209）
甘肃省科技重大专项计划项目(25ZDWA006) （25ZDWA006）
中国国家铁路集团有限公司科技研究开发计划项目(N2023G035) （N2023G035）
