滑坡碎屑流冲击力影响因素的离散元模拟

采用三维离散元模拟方法,研究了刚性挡板与坡脚的距离和坡角对滑坡碎屑流冲击力的影响。结果表明:相同坡角下,随着挡板距离的增加,滑坡碎屑流颗粒对挡板的冲击力逐渐减小;坡角越大,最大冲击力耗散越大;不同坡角下最大冲击力出现的时间有较大差异。挡板所受冲击力与时间的关系曲线可近似分为线性增大、持力阶段、线性减小3个阶段,3个阶段的变化随坡角的增大逐渐明显。冲击力线性增大阶段,坡角越大冲击力增加得越快;冲击力持力阶段的时间随着挡板距离增大而增加。

Discrete Element Simulation for Influence Factors of Landslide Debris Flow Impact Force

The three dimensional discrete element simulation was used to study the inf luence of the distance between rigid baff le and slope toe and the angle of slope toe on the impact force of landslide debris f low .The results show that the impact force of landslide debris f low particles on baff le decreases gradually with the baff le distance increasing at the same angle of slope toe,the larger the angle of slope toe,the greater the dissipation of maximum impact force is,and the time of maximum impact force appearance at different angle of slope toe is quite different.The relationship curve between impact force and time of baff le can be approximately divided into such three stages as linear increasing stage,holding stage and linear decreasing stage,the change of the three stages is gradually obvious with the increase of slope toe angle.In the linear increasing stage of impact force,the greater the angle of slope toe,the faster the impact force increases,and the duration of impact force holding stage increases with the baff le distance increasing.