Impact pressure of debris flow on beam dam  

作　　者：WANG Dong-wei YOU Yong LIU Jin-feng SUN Hao WANG Zhuang 

机构地区：[1]Key Laboratory of Mountain Hazards and Earth Surface Process,Chinese Academy of Sciences,Chengdu 610041 China [2]Institute of Mountain Hazards and Environment,CAS,Chengdu 610041,China [3]University of Chinese Academy of Science,Beijing 100049,China

出　　处：《Journal of Mountain Science》2023年第10期2822-2834,共13页山地科学学报（英文）

基　　金：jointly funded by the National Natural Science Foundation of China(Grant No.42201095);the Natural Science Foundation of Sichuan(Grant No.2022NSFSC1032)。

摘　　要：The use of open-type check dams in mountainous areas has become common practice in order to mitigate the effects of debris flow and extend the service life of engineering structures.The beam dam,a common debris flow control system,has received less attention in research on the impact process of debris flow and check dams compared to solid check dams.Additionally,the estimation of impact pressure in debris flow primarily considers debris flow characteristics,without taking into account the influence of geometric characteristics of the transmission structure.To better understand the impact process of debris flow on beam dams,a series of small-scale debris flow impact tests were conducted in a model flume.Key parameters,including velocity,depth,and impact pressure,were measured.The results show that the maximum impact pressure of debris flow is affected by both the characteristics of the debris flow and the relative opening size of the beam dam.Due to flow and edge occlusion in the middle of the beam dam,the discharge of debris flow is enhanced,resulting in a longer impact process and higher maximum impact pressure.Based on these findings,a calculation model of the maximum impact pressure of debris flow at the midpoint of the middle beam is proposed,which can be used to estimate the impact of debris flow on the discharge part of the beam dam.

关 键 词：Debris flow Beam dam Impact pressure Relative opening size Calculation model 

分 类 号：P642.23[天文地球—工程地质学]