Numerical simulation of dynamic catastrophe of slope instability in three Gorges reservoir area based on FEM and SPH method
Numerical simulation of dynamic catastrophe of slope instability in three Gorges reservoir area based on FEM and SPH method
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基于FEM和SPH方法的三峡库区边坡失稳动态灾害数值模拟
DOI：
10.1007/s11069-021-05075-z
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发表时间：
2021-10
期刊：
影响因子：
3.7
通讯作者：
Hao Zhang
中科院分区：
文献类型：
--
作者：
Zhengyang Su;Guizhi Wang;Yakun Wang;Xiang Luo;Hao Zhang
受持续强降雨影响，三峡库区每年都会发生大量滑坡灾害，造成严重的财产损失和人员伤亡。本文以某典型水库边坡为例进行了分析。首先，考虑渗流场和应力场的耦合作用，采用有限元方法模拟了边坡在连续强降雨作用下破坏前塑性区的变化。然后，基于光滑粒子流体动力学方法，采用HBP流变模型和Drucker-Prager屈服准则，模拟了边坡失稳后滑动的动态灾变过程，得到了基于N-S方程的速度场时空分布和滑坡堆积形态。通过分析边坡上各种物质交界处的侵蚀行为，揭示了边坡失稳滑移的动力学机制。
Affected by continuous heavy rainfall, a large number of landslide disasters occur every year in the Three Gorges Reservoir area, which causes serious property loss and casualties. In this study, we take a typical reservoir slope as an example. Firstly, the change of plastic zone of the slope under the action of continuous heavy rainfall before the failure is simulated based on the FEM method, considering the coupling of seepage field and stress field. Then, based on the smooth particle hydrodynamics method, HBP rheological model and Drucker–Prager yield criterion are used to simulate the dynamic catastrophic process of slope sliding after instability, and the time–space distribution of velocity field and accumulation form of the landslide are obtained based on the N-S equation. By analyzing the erosion behavior at the junction of various materials on the slope, the dynamic mechanism of the slope instability and slippage is revealed.
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