王健,黄波林,张全,陈小婷

• 1:三峡大学防灾减灾湖北省重点实验室
• 2:三峡大学湖北长江三峡滑坡国家野外观测站

摘要(Abstract)：

高密度颗粒流动现象与许多崩滑碎屑流类似,颗粒柱体崩塌试验一直是崩滑碎屑流动力研究的有效方法。基于野外柱状危岩体的成生及运动边界条件,在颗粒图像测速技术支持下,开展了一系列单面临空的颗粒柱体三维崩塌-堆积试验。结果表明:颗粒柱体的高宽比a值决定了其失稳模式和堆积形式,当a<1.5时,柱体临空侧颗粒沿着库伦破坏角运动,但柱体底部一部分颗粒仍保持不动,当a≥1.5时,颗粒体发生下沉-剪切-推出破坏,随后发生复杂的崩塌流动-堆积过程;柱体内颗粒呈近似的二维运动,柱体外则呈类扇体的扩展堆积,且圆心在X轴上往前移动,颗粒的运动与堆积的相关参数均可采用a的多个幂指数函数来定量刻画。高柱体的崩塌堆积试验结果可为压溃式柱状危岩体的运动评估及防治提供较多启示。

关键词(KeyWords)： 颗粒柱体;崩塌-堆积;颗粒图像测速;速度场;破坏过程

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划(2018YFC1504803);; 三峡后续工作地质灾害防治项目(0001212018CC60008,0001212019CC60001,2018102849)

作者(Author): 王健,黄波林,张全,陈小婷

DOI: 10.13928/j.cnki.wrahe.2020.02.016

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