基于块体离散元的高速远程滑坡灾害动力学研究

doi:10.13722/j.cnki.jrme.2019.0158

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摘要高速远程滑坡的破裂及致灾机制一直是滑坡灾害难点之一。为了深入高速远程滑坡灾害动力学过程，本文提出一种基于块体离散元法的黏结断裂模型，并基于图形处理器(GPU)实现了高性能并行计算，进而开发了地质体从连续到破裂解体过程的耦合模拟平台–耦合离散元程序(CoDEM)。在此基础上以2000年西藏易贡滑坡为例，系统研究了滑坡体的“高位崩塌区崩解启动–老滑坡体复活–碎屑流高速流动–堰塞体形成”的全过程。通过对比数值计算结果和现场地质调查资料，表明计算得到的堆积范围、物质组成与滑坡实际状态较为吻合。根据滑坡不同阶段的运动特征，将滑坡灾害区分为4个部分：启动区、缓冲区、流通区和刹车区。

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	刘广煜1
	徐文杰1
	佟彬2
	王立朝2

关键词 ：边坡工程, 高速远程滑坡, 黏结断裂模型, 块体离散元, 图形处理器(GPU), 耦合离散元程序(CoDEM)

Abstract：The fracture and disaster-causing mechanism of high-speed and long run-out landslides is one difficulty of landslide disasters. In order to deeply study the dynamic process of landslides from continuum to discontinuum，a cohesive fracture model is proposed based on block discrete element method. High-performance parallel computing based on graphics processor unit(GPU) is achieved， and a coupling simulation platform called couping discrete element method platform(CoDEM) is developed. Taking Yigong landslide as an example，the whole process of higher body collapsing，old landslide body resurrecting，debris flowing at a high speed and dam forming is studied systematically. Comparison between the numerical results and in-situ survey data is performed.It is shown that the numerical results including accumulation boundary and material components are in good agreement with the actual situation of the landslide. According to the dynamics characteristics during the landslide at different stages，the landslide area can be divided into four parts such as the initiation zone，the buffer zone，the circulation zone and the braking zone.

Key words： slope engineering high-speed and long run-out landslide cohesive fracture model block discrete element method graphics processing unit(GPU) coupling DEM(CoDEM)

引用本文:

刘广煜1，徐文杰1，佟彬2，王立朝2. 基于块体离散元的高速远程滑坡灾害动力学研究[J]. 岩石力学与工程学报, 2019, 38(8): 1557-1566.
LIU Guangyu1，XU Wenjie1，TONG Bin2，WANG Lichao2. Study on dynamics of high-speed and long run-out landslide hazards based on block discrete element method. , 2019, 38(8): 1557-1566.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2019.0158 或 http://www.rockmech.org/CN/Y2019/V38/I8/1557

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