滑坡运动冲击破碎物理模型试验研究#br#

doi:10.13722/j.cnki.jrme.2019.0850

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摘要高速岩质滑坡中的冲击破碎解体对其运动特性有较大的影响，并且运动过程中能量的迅速耗散与运动性能的瞬时改变，导致受灾范围的增大。通过开展物理模型试验，考虑岩质滑坡的复杂地形条件，设计陡坎来模拟滑坡体与外部不均匀地形之间的多次连续碰撞，利用不同物质组成和配比的不同数量的单位试块进行试验，研究岩质滑坡冲击破碎运动过程中滑块组成物质粒径、块体体积/试块数量对其运动特性的影响，采用高速摄像机及数码摄像机记录整个运动过程。试验结果表明：滑块总体运动时间随粒径的减小而增加并随块体体积的增加而增加，且堆积时间的增加为滑块总体运动时间增加的主要控制因素；块体平均速度及出口处的速度随粒径的减小而减小，随块体体积/试块数量的变化不明显，但整体波动范围均在1m/s之内；冲击破碎所造成的直接能量耗散占总势能的比例较小，但冲击破碎是岩质滑坡运动过程中能量耗散的重要因素，控制滑坡体的运动特性和能量耗散形式。

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	周月1
	廖海梅2
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	陈明亮2
	周家文1

关键词 ：边坡工程, 滑坡, 冲击破碎, 模型试验, 能量耗散, 破碎模式

Abstract：The impacting fragmentation of high-speed rock landslides has a great influence on the motion characteristics，and the rapid dissipation of energy and the instantaneous change of the movement performance in the process of movement lead to an expansion of the affected area. Physical modeling tests were conducted with heaves to simulate multiple consecutive impacting between landslide mass and external uneven ground surface，and different quantities of unit test blocks with different material compositions and ratios were used in the tests to investigate the influence of the particle size and the volume of the block on the kinetic characteristics of the rock landslide movement. A high-frequency camera and digital cameras were used to record the whole motion process. The test results show that the overall time of the movement increased with the decreasing particle size and the increasing volume of the block. Moreover，the accumulation time was the controlling factor of the overall movement time. It is also shown that both the average velocity of the movement process and the velocity at the exit reduced with the decreasing particle size while changed insignificantly with the volume of the block/the number of unit blocks within 1 m/s. The energy dissipation caused by impacting fragmentation accounted for a small proportion of the total potential energy，but the impacting fragmentation was an important factor of energy dissipation during rock landslide movement and controlled the motion characteristics and energy dissipation mode of the landslide body.

Key words： slope engineering')" href="#">

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引用本文:

周月1，廖海梅2，甘滨蕊1，陈明亮2，周家文1. 滑坡运动冲击破碎物理模型试验研究#br#[J]. 岩石力学与工程学报, 2020, 39(4): 726-735.
ZHOU Yue1，LIAO Haimei2，GAN Binrui1，CHENG Mingliang2，ZHOU Jiawen1. Physical modeling test on impacting fragmentation during landslide moving #br#. , 2020, 39(4): 726-735.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2019.0850 或 http://rockmech.whrsm.ac.cn/CN/Y2020/V39/I4/726

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