岩土力学2025，Vol.46Issue(12)：3740-3756,17.DOI:10.16285/j.rsm.2024.00589
降雨及库水位作用下碎石土岸坡变形破坏机制模型试验研究
Model test of deformation and failure mechanism of gravel soil bank slope under rainfall and reservoir water level
摘要
Abstract
Deformation of the deposit bank slope is intensified due to reservoir water regulation and rainfall,threatening reservoir operation.To investigate the deformation and failure mechanisms of bank slopes,as well as their infiltration characteristics,a large-scale physical model test was conducted to simulate rainfall and its interactions with water level fluctuations at the Sanbanxi Reservoir in Guizhou Province.The parameters such as pore water pressure in slope and the whole process of slope deformation evolution are obtained.The results show that:(1)The final shape of the modeled wetting front is determined by the slope shape,and the different infiltration effects are mainly manifested in the change of migration depth,and the seepage field characteristics and slope gradient have a greater influence on the migration rate.(2)The soil pressure curve changes gently under both conditions,the pore water pressure changes with a lag,and the soil pressure and pore water pressure in the deeper layers of the slope body fluctuate more than those in the shallower layers in the saturated state.(3)Slope deformation during rainfall is dominated by erosion pits and localized slides,while erosion channels dominate during coupling,and the scale of slope erosion during coupling is about twice as large as that during rainfall,but multi-stage slip traction damage occurs at the foot of the slopes in both conditions.(4)Based on the experimental results,the deformation and damage mechanism of the modeled bank slope under the coupled rainfall and water level is summarized into five stages:softening and settling of the slope surface,development and expansion of erosion gullies,and development of erosion channels and collapse at the foot of the slope.The results of this study fill the gap in the study of bank slope stability under the above conditions in Sanbanxi Reservoir area,and it is useful for the study of similar deformation damage of gravel soil bank slopes and their prevention and control.关键词
降雨与库水位/碎石土岸坡/模型试验/变形破坏机制/入渗特性Key words
rainfall and reservoir water level/gravel soil bank slope/model test/deformation and failure mechanism/infiltration features分类
建筑与水利引用本文复制引用
DING Jun-ling,JI Feng,WEI Song,ZHANG Bo,ZENG Rui,LI Zhuo,LU Yu-peng..降雨及库水位作用下碎石土岸坡变形破坏机制模型试验研究[J].岩土力学,2025,46(12):3740-3756,17.基金项目
国家自然科学基金(No.41977273). This work was supported by the National Natural Science Foundation of China(41977273). （No.41977273）
