Three-Dimensional Discontinuous Deformation Analysis of Failure Mechanisms and Movement Characteristics of Slope Rockfalls
Three-Dimensional Discontinuous Deformation Analysis of Failure Mechanisms and Movement Characteristics of Slope Rockfalls
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DOI：
10.1007/s00603-021-02656-z
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发表时间：
2021-09-30
影响因子：
6.2
通讯作者：
Liu, Guoyang
中科院分区：
文献类型：
--
作者：
Ma, Ke;Liu, Guoyang
岩崩是一种典型的源自危险岩体的不连续块体系统的动力问题，在山区公路边坡沿线经常造成严重的地质灾害。本研究旨在通过三维非连续变形分析（3D DDA）方法研究岩崩破坏机制和运动特征，试图全面考察岩崩灾害复杂的运动过程。针对岩崩的初始破坏和运动后特征（即运动轨迹和动能），通过与室内实验结果的对比，验证了三维DDA的有效性。然后，研究了不同几何特征的边坡，即滑坡前边坡和浅滑坡后边坡和深滑坡后边坡的巨石和块状崩塌岩的运动特征。结果表明，三维DDA在分析边坡岩崩破坏机制方面具有显著优势，能够较好地模拟边坡和块体的三维几何形状，模拟块体的空间运动（如侧向偏移和挠度）。三维DDA数值模拟可以预测岩崩灾害的运动范围、沉积位置和影响区域，为实际工程中制定防灾对策提供依据。
A rockfall is a typical dynamic problem of a discontinuous block system originating from a dangerous rock mass and always presents serious geo-hazards along highway slopes in mountainous areas. This study aims to investigate the failure mechanisms and movement characteristics of rockfalls through a three-dimensional discontinuous deformation analysis (3D DDA) method and attempts to comprehensively examine the complicated kinematic process of rockfall disasters. In terms of the initial failure and post-movement characteristics (i.e., motion trajectory and kinetic energy) of a rockfall, the effectiveness of 3D DDA is verified by comparing its results with those of laboratory experiments. Taking the K4580 typical high-steep slope undergoing rockfalls along the G318 national highway in Tibet as an example, the initiation and failure of a single boulder and a large-scale rock mass at the source area were simulated by 3D DDA. Then, the movement characteristics of the boulder and massive collapsing rocks along the slopes of different geometrical characteristics, i.e., the slopes before the landslide and after the shallow and deep landslides, were studied. The results show that the 3D DDA has significant advantages in analysing the failure mechanisms of slope rockfalls and can satisfactorily simulate the spatial movement (e.g., lateral deviation and deflection) of blocks by considering the 3D geometry of the slopes and blocks. The 3D DDA numerical simulation can predict the movement range, deposition position, and affected area of rockfall disasters, which can provide a basis for formulating disaster prevention countermeasures in actual projects.