A full understanding of the interaction mechanisms among flow-like landslides and impacted protection structures is still an open issue. Although several approaches, from experimental to numerical, have been used so far, a thoroughly assessment of the hydromechanical behaviour of the landslide body is achievable only through a multiphase and large deformation approach.

This paper firstly proposes a conceptual model for a specific type of protection structure, namely a Deformable Geosynthetics-Reinforced Barrier (DGRB), i.e., an embankment made of coarse-grained soil layers reinforced by geogrids. In such a case, the sliding of the barrier along its base, under the impulsive action of a flow-type landslide, is an important landslide energy dissipation mechanism, and a key issue for the design. Then, two different approaches are proposed: i) an advanced hydro-mechanical numerical model based on Material Point Method is tested in simulating the whole complex landslide-structure interaction mechanisms, ii) an analytical model is set up to deal with the landslide energy dissipation and the kinematics of both the landslide and barrier. The calibration of the proposed analytical model is pursued based on the numerical results. Finally, the analytical model is successfully validated to interpret a large dataset of landslide impact field evidence, for whose interpretation also five empirical methods available in the literature are tested.

充分了解流状滑坡与受影响保护结构之间的相互作用机制仍然是一个悬而未决的问题。尽管到目前为止已经使用了从实验到数值的几种方法，但只有通过多相和大变形方法才能对滑坡体的流体力学行为进行彻底评估。

本文首先提出了一种特定类型保护结构的概念模型，即变形土工合成材料加筋屏障（DGRB），即由土工格栅加筋的粗粒土层构成的路堤。在这种情况下，在流动型滑坡的冲力作用下，挡板沿其底部的滑动是滑坡消能的重要机制，也是设计的关键问题。然后，提出了两种不同的方法：i）基于质点法的先进流体力学数值模型在模拟整个复杂的滑坡-结构相互作用机制中进行了测试，ii）建立了处理滑坡能量耗散的分析模型以及滑坡和障碍物的运动学。所提出的分析模型的校准是基于数值结果进行的。最后，该分析模型被成功验证以解释滑坡影响现场证据的大型数据集，对其解释还测试了文献中可用的五种经验方法。