摘要
根据相似原理设计制作滑体下滑及冲击模型,采用光电传感器与计时器组成摩擦因数测量系统,高频动态土压力传感器与动态应变采集仪组成冲击力测量系统。提出完全弹性碰撞和完全非弹性碰撞情况下冲击能测量原理。测量同质量不同粒径组成的滑体冲击能。结果表明:滑体冲击能随粒径的减小而大幅减小,原因是粒径减小滑体内部能耗增加;同时,滑体与滑动路径摩擦因数增加,导致滑体与滑动路径摩擦能耗也增加。在滑体内部能耗机制不明的情况下,基于试验分析提出2种滑体冲击能计算方法,为进一步研究提供参考。通过与以往计算方法的比较表明:对于各种粒组的滑体,忽略滑体内部能耗的计算结果均比考虑滑坡内部崩解的计算结果大很多,且差异程度随滑体粒径的减小而增加。
Because of lack of internal energy dissipation law of landslide in the sliding and impact processes,we can not calculate the impact energy precisely.In order to solve this issue,the landslide models are designed and constructed according to the similarity principle.The measurement system of friction coefficient is made up of photoelectric sensor and electronic timer;and the measurement system of impact force is made up of dynamic soil pressure sensor and dynamic strain acquisition instrument.A measurement method of impact energy is proposed for the situations of perfect elastic collision and completely inelastic collision.The impact energies of landslide mass with the same weight and different particle sizes are tested.The results show that the impact energies decrease markedly with the particle size decreasing.And the reasons are that：the internal energy dissipation of landslide mass increase with the particle sizes decreasing;and the friction coefficient between the landslide mass and sliding path increases also,which adds to the friction energy dissipation.Based on the experiment analysis,two methods are proposed to calculate the impact energy,which provide reference for the further research,under the condition of unknown internal energy dissipation mechanism.The comparison with the existing method indicates that：for the landslides composed of all kinds of particle sizes,the result of method ignoring the inner energy dissipation is bigger than the proposed two methods;and the differences increase with the particle size decreasing.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2011年第4期693-701,共9页
Chinese Journal of Rock Mechanics and Engineering
关键词
岩石力学
滑坡
冲击能
模型试验
rock mechanics
landslide
impact energy
model experiment
