Dynamics of creeping landslides controlled by inelastic hydro-mechanical couplings

Slow-moving landslides affect proximal infrastructures and communities, often causing extensive economic loss. While many of these exhibit slow episodic sliding for decades or more, they sometimes accelerate rapidly fail catastrophically. Although it is known that the landslide dynamics are controlled by hydro-mechanical processes, few analytical models enable a versatile incorporation inelastic behavior shear zone materials, thus hindering an accurate quantification how their properties modulate magnitude rate coupled fluid flow motion. To address this problem, we develop simulation framework incorporating rainfall-induced, deformation-mediated pore-water pressure transients at base active landslides. The involves computation two sequential diffusion one within upper rigid-porous block, another zone. can be linked to any elastoplastic constitutive laws, here model motion through elastic-perfectly plastic frictional model, which enables us account standard earthen materials such as elastic moduli, friction angle, dilation hydraulic conductivity. Numerical case studies relevant slow-moving in California Coast Ranges show proposed formulation captures different temporal patterns movement induced precipitation. In each case, achieved relatively match between data simulations positive coefficients, leads spontaneous generation negative excess self-regulating Conversely, with no (hence, reflecting approach critical state) produce sharp acceleration, typical catastrophic runaway acceleration. Our findings encourage use conjunction laws tailored site-specific geomaterial availability, favoring representation variety creeping trends observed nature.