摘要
为深入分析降雨作用下裂隙的存在对边坡稳定性的影响,针对边坡中广泛存在的竖向、内部等裂隙形态进行缩尺模型降雨实验,并结合数值计算及粒子图像测速法(particle image velocimetry,PIV)进行稳定性分析及边坡失稳机理研究.研究结果表明:上缘竖向裂隙的存在加速了雨水入渗及地下水位抬升,坡内裂隙会使雨水聚集,进而水分顺裂隙迁移并加速了裂隙上缘块体的滑落,含裂隙边坡失稳时间较无裂隙边坡提前了18%~40%;当上缘裂隙和内部裂隙均考虑时,边坡稳定性系数骤降,在计算稳定性系数小于1后短时间内滑坡迅速发生;PIV结果显示带裂隙边坡失稳时粒子运动速度更快、诱发滑动区域更广、破坏性更强.相关结果可作为降雨条件下边坡安全判定及滑坡预警的重要参考.
In order to deeply analyze the influence of the cracks on the stability of slopes under rainfall condition,the scaled-down rainfall model tests for slopes with vertical and internal cracks are conducted.With the combinations of numerical computation and particle image velocimetry(PIV),the slope safety analysis and slope destabilization mechanism are studied.The results of the study show that:the existence of vertical cracks on the upper edge accelerates rainwater infiltration and groundwater level elevation.The cracks inside the slope will cause rainwater to collect,and then the moisture will migrate to both sides of the fissures,accelerating the sliding of the blocks at the upper edge of the cracks;Considering the time of destabilization of slopes with cracks is 18%~40%earlier than that of slopes without cracks.When both kinds of cracks are considered,the slope factor of stability decreases abruptly,and the landslide occurs rapidly within a short period of time after the calculation of factor of stability less than 1.0;The PIV results show that when the slope with crack is destabilized,the particle motion of the slope is faster,the induced sliding area is wider,and the damage is stronger than that without cracks.The results can be used as an important reference for the determination of slope safety and landslide warning under rainfall conditions.
作者
卢功臣
虞子楠
LU Gongchen;YU Zinan(Shaanxi Provincial Water Conservancy and Electric Power Survey and Design Institute,Xi'an 710001,China;School of Highway,Chang'an University,Xi'an 710064,China)
出处
《三峡大学学报(自然科学版)》
北大核心
2025年第4期31-37,共7页
Journal of China Three Gorges University:Natural Sciences
基金
国家重点研发计划项目(2017YFD0800501)。
关键词
降雨
裂隙
模型试验
稳定性系数
粒子图像测速法
rainfall
cracks
model test
factor of stability
particle image velocimetry
