Modeling Slope Instability as Shear Rupture Propagation in a Saturated Porous Medium

Viesca, Robert C.; Rice, James R.

doi:10.1007/978-90-481-3071-9_18

Cited by 6 publications

(6 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We use the finite element package ABAQUS/Explicit in a similar manner as that by Templeton and Rice [2008] and Viesca et al [2008], except to be consistent with our quasi‐static model, only considering elastic behavior away from the contact surface. (Those investigations, as well as those of Viesca and Rice [2009], considered elastic‐plastic response of material outside the slip surface. )…”

Section: Rupture Nucleation By Local Increases In Pore Pressurementioning

confidence: 98%

Nucleation of slip‐weakening rupture instability in landslides by localized increase of pore pressure

Viesca¹,

Rice²

2012

J. Geophys. Res.

108

View full text Add to dashboard Cite

[1] We model landslide initiation as slip surface growth driven by locally elevated pore pressure, with particular reference to submarine slides. Assuming an elastic medium and friction that weakens with slip, solutions exist in which the slip surface may dynamically grow, without further pore pressure increases, at a rate of the order of the sediment shear wave speed, a situation comparable to earthquake nucleation. The size of the rupture at this transition point depends weakly on the imposed pore pressure profile; however, the amount of slip at the transition depends strongly on whether the pore pressure was broadly or sharply elevated. Sharper profiles may result in pore pressures reaching the total slope-normal stress before dynamic rupture is nucleated. While we do not account for modes of failure other than pure slip on a failure surface, this may be an indication that additional modes involving liquefaction or hydraulic cracking may be factors in the initiation of shallow slope failure. We identify two length scales, one geometrical (h, depth below the free surface) and one material (', determined by the frictional weakening rate) and a transition in nucleation behavior between effectively "deep" and "shallow" limits dependent on their ratio. Whether dynamic propagation of failure is indefinite or arresting depends largely on whether the background shear stress is closer to nominal peak or residual frictional strength. This is determined in part by background pore pressures, and to consider the submarine case we simplify a common sedimentation/consolidation approach to reflect interest in near-seafloor conditions. Citation: Viesca, R. C., and J. R. Rice (2012), Nucleation of slip-weakening rupture instability in landslides by localized increase of pore pressure,

show abstract

Section: Rupture Nucleation By Local Increases In Pore Pressurementioning

confidence: 98%

Nucleation of slip‐weakening rupture instability in landslides by localized increase of pore pressure

Viesca¹,

Rice²

2012

J. Geophys. Res.

108

View full text Add to dashboard Cite

show abstract

“…A final mechanism that could explain progressive in-situ sediment failure is shear rupture propagation (Puzrin et al, 2004;Petley et al, 2005;Viesca and Rice, 2010) at the base of the failed strata. The mechanism has been proposed for bedding-plane controlled landslides, and does not require excess pore pressures to accumulate along the entire landslide length, which may be unrealistic.…”

Section: Shear Rupture Propagationmentioning

confidence: 99%

“…16D). Normal surface stress changes, such as those due to avalanche loading, promote fracture propagation in a downslope direction (Viesca and Rice, 2010).…”

Section: Shear Rupture Propagationmentioning

confidence: 99%

Widespread and progressive seafloor-sediment failure following volcanic debris avalanche emplacement: Landslide dynamics and timing offshore Montserrat, Lesser Antilles

et al. 2012

View full text Add to dashboard Cite

“…In this work, we require the pore pressure on the fault (equation ( 16)). Calculation of on-fault pore pressure from pore pressures in the volume is not trivial when there is inelastic strain [Viesca et al, 2008;Viesca and Rice, 2009]. We assume the on-fault pore pressure to be the average of the pore pressures on both sides of the fault in this work.…”

Section: Dynamic Rupture Modelmentioning

confidence: 99%

Dynamic fault weakening and strengthening by gouge compaction and dilatancy in a fluid‐saturated fault zone

Hirakawa

2016

JGR Solid Earth

View full text Add to dashboard Cite

Fault gouge deformation likely plays a significant role in controlling the strength of mature, large‐displacement faults. Experiments show that intact gouge deforms in an overall ductile and stable manner, readily compacting, but dilates and experiences brittle failure under large strain rate. Inelastic gouge compaction and dilatancy are modeled here using a combined Mohr‐Coulomb and end‐cap yield criterion in a dynamic rupture model of a strike‐slip fault with strongly velocity‐weakening friction. We show that large shear stress concentration ahead of the rupture associated with the rupture front causes the gouge layer to compact (e.g., by structural collapse and comminution), leading to rapidly elevated pore pressure and significant weakening of the principal fault surface. Shortly after the rupture front passes, strong dilatancy during strength drop and rapid sliding reduces pore pressure and strengthens the fault, promoting slip pulses. Large strain localization in the gouge layer occurs as a result of rapid gouge dilatancy and strain softening. The combination of prerupture weakening from compaction and restrengthening from dilatancy hardening leads to a smaller‐strength drop, and limits the stress concentration outside the gouge layer. This leads to a reduction of inelastic shear strain in the damage zone, which is more consistent with geological observations and high‐speed frictional experiments. With the presence of well‐developed fault gouge, the strength of mature faults may be limited by end‐cap rather than Mohr‐Coulomb failure; thus, their frictional strengths are significantly smaller than Byerlee friction.

show abstract

Modeling Slope Instability as Shear Rupture Propagation in a Saturated Porous Medium

Cited by 6 publications

References 24 publications

Nucleation of slip‐weakening rupture instability in landslides by localized increase of pore pressure

Nucleation of slip‐weakening rupture instability in landslides by localized increase of pore pressure

Widespread and progressive seafloor-sediment failure following volcanic debris avalanche emplacement: Landslide dynamics and timing offshore Montserrat, Lesser Antilles

Dynamic fault weakening and strengthening by gouge compaction and dilatancy in a fluid‐saturated fault zone

Contact Info

Product

Resources

About