场地条件对滑坡-碎屑流运动冲击特征的影响研究

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摘要滑坡碎屑流的运动场地条件差异性大，导致相同规模滑坡的运动参数以及冲击作用存在显著差异。为了量化场地条件的作用机制，运用三维离散元模拟方法，以场地条件为变量，开展滑坡碎屑流的冲击研究，以斜坡坡度、堆积区坡度和场地几何特征为变量因素进行数值模拟分析。研究结果表明：不同斜坡坡度下，颗粒的平均速度时程曲线都可以分为加速和减速两个阶段。斜坡坡度越大，平均速度越大，沿斜坡坡面滑动所消耗的能量随之减小，对拦挡结构的冲击力越大。堆积区坡度的增加，冲击力峰值和终值都随之增加，但对碎屑流颗粒的平均速度影响不显著。拦挡结构与坡脚距离越远，颗粒的动能在运动过程的消耗随之增加，冲击力越小。最大运动速度与拦挡结构所受冲击力大小排序一致，即凸面型＞直线型＞凹面型。

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	张睿骁1
	苏栋1
	樊晓一2
	姜元俊3
	吴泽雄1

关键词 ：碎屑流, 场地条件, 运动, 冲击

Abstract：The movement ground conditions of rock avalanches vary greatly, resulting in significant differences in the motion parameters and impact effects of the same scale of landslide. In order to quantify the mechanism of site conditions, three-dimensional discrete element simulation software was used to carry out the impact study of rock avalanches with ground conditions as variables. Slope gradient, slope of accumulation area and site geometric characteristics were taken into consideration in the numerical simulation. The results indicated that the average velocity-history curves of particles can be divided into acceleration and deceleration stages under different slope gradients. The greater the slope, the greater the average velocity and the impact force are. Because the energy consumed by sliding along the slope surface decreased. Both the peak and final value of impact force increase with the increase of the slope of the accumulation area, which has slightly effect on the average velocity of rock avalanches particles. The further the distance between the blocking structure and the slope toe is, the more the kinetic energy of the particles is consumed during the movement process. And this leads to the impact force becomes small. There is the same order between the maximum velocity and the impact force, convex>straight>concave.

Key words： rock avalanches ground conditions motion impact

收稿日期: 2020-07-15 出版日期: 2022-01-28

引用本文:

张睿骁1，苏栋1，樊晓一2，姜元俊3，吴泽雄1. 场地条件对滑坡-碎屑流运动冲击特征的影响研究[J]. 振动与冲击, 2022, 41(2): 229-239.
ZHANG Ruixiao1,SU Dong1,FAN Xiaoyi2,JIANG Yuanjun3,WU Zexiong1. Influence of site conditions on the motion and impact effect of rock avalanches. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(2): 229-239.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2022/V41/I2/229

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