摘要
为研究山地区域的崩塌及后续形成的颗粒流灾害,对不同粒径与高宽比的颗粒柱开展了颗粒柱崩塌室内模型试验,分析了颗粒柱崩塌过程中的声发射信号与颗粒运动的动力学参数在时间上的变化趋势。结果表明:在直接监测的情况下,声发射信号的能量参数比计数参数更适合用于动力学分析;颗粒运动参数与能量具有良好的线性关系,随着颗粒运动速度的增大,能量变化速率随之增大;相应的,颗粒位移与累计能量也具有同样的对应关系,且在时间序列上均符合Boltzmann模型曲线;不同高宽比与颗粒粒径仅改变动力学参数与声发射信号的数值大小,不会影响它们之间的变化趋势。声发射信号曲线能够用于判定崩塌颗粒运动所处的阶段,对开展崩塌灾害监测评估具有重要意义。
In order to study the collapse and subsequent particle flow disasters in mountainous areas, a series of particle column collapse tests were carried out by using particle columns with different particle size and height-width ratio.The variation trend of acoustic emission signals and dynamic parameters of particles’ movement during the collapse process was analyzed.The results showed that under direct monitoring, the energy parameter of acoustic emission signal was more suitable as an indicator for dynamic analysis than the counting parameter.Particle motion parameters and energy have a good linear relationship.As the particle motion speed increased, the rate of energy change increased correspondingly.Also, the particle displacement and the accumulated energy had a same corresponding relationship, and both conformed to the Boltzmann model curve in the time series.Different height-width ratios and particle sizes only changed the magnitudes of the kinetic parameters and the acoustic emission signals, but would not affect the trend between them.From the acoustic emission signal curve, it was possible to determine the stage of the movement of the collapsing particle columns, which was of great significance to monitoring and evaluation for collapse disasters.
作者
童世林
曲景学
何思明
TONG Shilin;QU Jingxue;HE Siming(State Key Laboratory of Hydraulics and Mountain River Development and Protection,Sichuan University,Chengdu 610065,China;Institute of Mountain Disasters and Environment,CAS,Chengdu 610041,China)
出处
《人民长江》
北大核心
2022年第10期153-159,共7页
Yangtze River
基金
国家自然科学基金项目(41772312)
国家自然科学基金重大项目(41790433)
中国科学院重点部署项目(KFZD-SW-424)。
关键词
颗粒柱
崩塌
声发射
粒径分布
高宽比
particle column
collapse
acoustic emission
particle size distribution
height-width ratio
