Application of a SPH depth-integrated model to landslide run-out analysis
Application of a SPH depth-integrated model to landslide run-out analysis
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DOI：
10.1007/s10346-014-0484-y
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发表时间：
2014-05
期刊：
影响因子：
6.7
通讯作者：
M. Pastor;T. Blanc;B. Haddad;S. Petrone;M. S. Morles;V. Drempetic;D. Issler;G. Crosta;L. Cascini;G. Sorbino;S. Cuomo
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文献类型：
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作者：
M. Pastor;T. Blanc;B. Haddad;S. Petrone;M. S. Morles;V. Drempetic;D. Issler;G. Crosta;L. Cascini;G. Sorbino;S. Cuomo
潜在长径流滑坡的危险性评价越来越重要。利用不同的本构模型、初始数据和数值求解技术的数值工具对于使专家的评估更加客观非常重要，尽管它们不能取代专家对现场具体条件和所涉过程的理解。本文提出了一个深度积分模型占孔隙水压力消散和应用程序的真实的事件和问题的解析解存在。主要内容是：（i）数学模型，其中包括孔隙压力消散作为一个附加方程。这使得有可能在一开始就对流动性很高的滑坡问题进行建模，一旦孔隙水压力消散，滑坡体就会停止。(ii)描述基础摩擦的流变模型：宾汉模型、摩擦模型、Voellmy模型和粘-摩擦粘模型。(iii)我们已经实施了简单的侵蚀法，提供了比较Egashira，Hungr和Blanc的方法。(iv)我们提出了一个拉格朗日SPH模型离散方程，包括孔隙水压力的信息与移动SPH节点。
Hazard and risk assessment of landslides with potentially long run-out is becoming more and more important. Numerical tools exploiting different constitutive models, initial data and numerical solution techniques are important for making the expert’s assessment more objective, even though they cannot substitute for the expert’s understanding of the site-specific conditions and the involved processes. This paper presents a depth-integrated model accounting for pore water pressure dissipation and applications both to real events and problems for which analytical solutions exist. The main ingredients are: (i) The mathematical model, which includes pore pressure dissipation as an additional equation. This makes possible to model flowslide problems with a high mobility at the beginning, the landslide mass coming to rest once pore water pressures dissipate. (ii) The rheological models describing basal friction: Bingham, frictional, Voellmy and cohesive-frictional viscous models. (iii) We have implemented simple erosion laws, providing a comparison between the approaches of Egashira, Hungr and Blanc. (iv) We propose a Lagrangian SPH model to discretize the equations, including pore water pressure information associated to the moving SPH nodes.