Compaction front and pore fluid pressurization in horizontally shaken drained granular layers.

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985858%3A_____%2F20%3A00524193" target="_blank" >RIV/67985858:_____/20:00524193 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0308904" target="_blank" >http://hdl.handle.net/11104/0308904</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevFluids.5.054301" target="_blank" >10.1103/PhysRevFluids.5.054301</a>

Result language

angličtina

Original language name

Compaction front and pore fluid pressurization in horizontally shaken drained granular layers.

Original language description

In many natural granular systems, the interstitial pores are filled with a fluid. Deformation of this two-phase system is complex, is highly coupled, and depends on the initialnand boundary conditions. Here we study granular compaction and fluid flow in a saturated, horizontally shaken, unconfined granular layer, where the fluid is free to flow in and out of the layer through the free upper surface during shaking (i.e., drained boundary condition). The geometry, boundary conditions, and parameters are chosen to resemble a shallow soil layer, subjected to horizontal cyclic acceleration simulating that of an earthquake. We develop a theory and conduct coupled discrete element and fluid numerical simulations. Theoretical and simulation results show that under drained conditions and above a critical acceleration, the grain layer compacts at a rate governed by the fluid flow parameters of permeability and viscosity and is independent of the shaking parameters of frequency and acceleration. A compaction front develops, swiping upward through the system. Above the front, compaction occurs and the fluid becomes pressurized. Pressure gradients drive fluid seepage upward and out of the compacting layer while supporting the granular skeleton. The rate of compaction and the interstitial fluid pressure gradient coevolve until fluid seepage forces balance solid contact forces and grain contacts disappear. As an outcome, the imposed shear waves are not transmitted and the region is liquefied. Below the compaction front (i.e., after its passage), the grains are well compacted, and shaking is transmitted upward. We conclude that the drained condition for the interstitial pore fluid is a critical ingredient for the formation of an upward-moving compaction front, which separates a granular region that exhibits a liquidlike rheology from a solidlike region.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10505 - Geology

Project

<a href="/en/project/GJ19-21114Y" target="_blank" >GJ19-21114Y: Granular mechanics of dynamically-triggered earthquakes</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review Fluids

ISSN

2469-990X

e-ISSN

—

Volume of the periodical

5

Issue of the periodical within the volume

5

Country of publishing house

US - UNITED STATES

Number of pages

25

Pages from-to

054301

UT code for WoS article

000530033200003

EID of the result in the Scopus database

2-s2.0-85087865420