摘要
为定量模拟文家沟高速远程滑坡-碎屑流运动过程中所产生的超前冲击气浪的分布和变化规律,采用计算流体力学软件FLUENT,通过用户自定义接口在滑坡运动的不同阶段分别引入Friction和Voellmy流变模型定义滑坡-碎屑流所受的运动阻力,反演了文家沟高速远程滑坡-碎屑流运动的全过程并与滑坡实际运动特征对比的同时,模拟了其超前冲击气浪的速度和相对压力分布,并对其产生机理进行了分析。结果表明:(1)文家沟滑坡-碎屑流共经历约210 s,碎屑流引起的超前冲击气浪主要分布于其前方、上方和两侧,最大速度约35 m/s,最大相对压强约2.2 k Pa;(2)气浪相对压力峰值出现于近地面处并随高度增加迅速减小,当离地面高度超过600 m时趋近于0;(3)地形起伏对于超前冲击气浪相对压力分布有明显影响;当滑体前方出现陡立壁面时,气浪压力陡升。
To examine the runout behavior of the Wenjia valley rock avalanche and the characteristics of the air-blast induced by the event, a computational fluid dynamics software FLUENT, incorporating the resistance between the sliding mass and travel path defined by laws of Friction and Voellmy, was applied in the study. The results indicate that the sliding process lasted for about 210 s with a maximum velocity and relative pressure of 35 m/s and 2.2 kPa, respectively, and both of them were reached at t = 60 s. Vertically, the relative pressure reached its maximum near the travel path and decreased fast while the elevation got higher. With the relative elevation higher than 600 m, the relative pressure decreased to zero. When the sliding mass arrived at the toe of a convex, it violently squeezed the air ahead, leading to a sharp increase in pressures.
出处
《水文地质工程地质》
CAS
CSCD
北大核心
2016年第6期113-119,共7页
Hydrogeology & Engineering Geology
基金
国家自然科学基金项目资助(41272382
41530639
41372332)
