高位远程岩质滑坡动力解体效应研究

doi:10.13722/j.cnki.jrme.2022.0010

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摘要高位远程滑坡具有较大的坠落高差和势动能转化空间，动力解体效应尤为明显，是防灾减灾领域研究中的难点问题之一。通过离散元数值模型试验，深入分析滑体结构面密度、结构面强度对滑体动力解体效应的影响，揭示高位远程滑坡–碎屑流的动力解体机制。结果显示：(1) 高位岩质滑体运动过程中动力解体模式主要分为两种类型：差速运动的主动解体和冲击碰撞的被动解体；(2) 岩体结构面密度、结构面强度是决定高位岩质滑坡解体向碎屑流转换的根本原因；(3) 动力解体过程体现了滑体岩块能量转化和消耗，摩擦耗能、非弹性形变耗能和解体耗能是主要耗能方式，其中摩擦耗能为主导的能量消耗，占比超过50%；(4) 滑体解体后前部岩石块体具有显著的速度传递现象，解体程度高的滑体比解体程度低的滑体速度传递现象更加明显。基于上述研究结果，认为在高位岩质滑坡风险调查与预测过程中，应当充分进行岩体结构面特征调查与评价，并在高位远程灾害链风险评估中充分考虑动力解体效应的影响。

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	高杨1
	殷跃平2
	李壮3
	李滨1
	吴伟乐3
	张晗3

关键词 ：边坡工程, 高位远程滑坡, 动力解体, 结构面特征, 能量耗散, 速度传递

Abstract：High position and long runout landslides have a large height of fall，potential energy and kinetic energy conversion space，and obvious dynamic disintegration effect，which is one of the difficulties and hot issues in the research field of geological disasters. Based on the discrete element numerical model test，the influences of structure plane density，structure plane strength and disintegration degree of landslide rock mass on dynamic disintegration during movement are deeply analyzed. Also，the dynamic mechanism of high position and long runout landslide-debris flow is revealed. The results show that (1) high position and long runout rock landslide dynamic disintegration mode is mainly divided into two types：the active disintegration of differential motion and the passive disintegration of impact collision. (2) Structural plane density，structural plane strength and disintegration degree are the fundamental causes affecting the high rock landslide dynamic disintegration effect；(3) Dynamic disintegration reflects energy conversion and consumption. Friction，inelastic deformation and disintegration are the main energy consumption modes，and the friction energy consumption is the leading energy consumption，accounting for more than 50%；(4) The front sliding body has significant speed transmission，and the velocity transmission phenomenon of the sliding body with high disintegration degree is more obvious than that of the sliding body with low disintegration degree. The research results show that in the process of geological disaster investigation，monitoring and prediction，the structural feature investigation and evaluation of the rock mass should be fully conducted. Also，the impact of the dynamic disintegration effect should be fully considered in the risk assessment of high position and long runout landslides.

Key words： slope engineering high position and long runout landslide dynamic disintegration structural plane features energy dissipation speed transmission

引用本文:

高杨1，殷跃平2，李壮3，李滨1，吴伟乐3，张晗3. 高位远程岩质滑坡动力解体效应研究[J]. 岩石力学与工程学报, 2022, 41(10): 1958-1970.
GAO Yang1，YIN Yueping2，LI Zhuang3，LI Bin1，WU Weile3，ZHANG Han3. Study on the dynamic disintegration effect of high position and long runout rock landslide. , 2022, 41(10): 1958-1970.

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https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2022.0010 或 https://rockmech.whrsm.ac.cn/CN/Y2022/V41/I10/1958

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