MPM evaluation of the dynamic runout process of the giant Daguangbao landslide

摘要: Giant landslides can cause significant damage to their dynamic runout processes. Understanding the mechanics of process is essential for landslide risk assessment and mitigation design. This paper investigates 1.16 × 109 m3 giant Daguangbao triggered by 2008 Ms 8.0 Wenchuan earthquake. The a typical bedding-plane slide properties basal sliding surface play key role in behaviors landslide. material point method (MPM) adopted as numerical tool simulations. A thermal-based velocity-weakening friction law used simulate contact between body surface. strain-softening constitutive model evaluate damages inside effects on Numerical results reveal that mass slides along whole initially then disintegrates during process. calculated duration 64 s maximum velocity reaches 60 m/s. coefficient slip decreases sharply starts move, steady-state μ ≈ 0.06 reached when exceeds approximately 20 m/s. Friction degradation shows sensible influence final distance depth deposit zone. fragmentation body, distance, deposition topography are also significantly affected softening.