【智汇论坛】第82期
滑坡运动的最精简建模：数值分析应该有多复杂？
Minimalist Modeling of Landslide Motion: How Complex Should Numerical Analyses Be?
报告人简介
报告简介
滑坡运动的最精简建模：数值分析应该有多复杂？
Minimalist Modeling of Landslide Motion: How Complex Should Numerical Analyses Be?
Landslides are complex processes often produced by environmental agents and able to affect both infrastructures and communities. Their life cycle involves a wide range of processes, from slow creep-like motion to gradual acceleration due to basal shear failure, or, in extreme cases, fast runout. The simulation of these often-interconnected processes over long timeframes comes with challenges, as it requires computationally expensive techniques, especially if used in conjunction with advanced constitutive laws for the materials in the landslide body. This talk discusses a semi-analytical framework which aims to resolve the coupled dynamics of pore pressure development and landslide motion by guaranteeing an accurate representation of the geomaterials’ response, while simplifying the modeling scheme and reducing dramatically the computational cost of the analysis. For simple material models, such as perfectly plastic frictional laws, the framework enjoys closed-form analytical solutions to replicate episodic creep-like events (dilative response) or self-sustained flow-like motion (contractive response). For advanced constitutive laws based on the critical state theory, the proposed framework can be readily integrated numerically to capture phenomena such as catastrophic landsliding, liquefaction, and runaway failure. While in its current form the approach is not meant as a substitute for the simulation of spatially heterogeneous landslide processes, it represents a versatile diagnostic tool prior to full-fledged multi-dimensional analyses. Its potential applications include the rapid assessment of landslide risk across large areas and over time intervals of numerous years, i.e., two essential steps to quantify the potential implications of climate change in densely populated settings.
