Effects of roughness on permeability evolution and frictional behavior of fractures under shear

Y. Fang, D. Elsworth, T. Ishibashi, F. Zhang

Research output: Contribution to conferencePaper

Abstract

Our experiments investigate the role of roughness in fracture permeability and frictional behavior using artificial fractures with controlled roughness. The results show that (1) Rougher surfaces indicate higher frictional stability and frictional strength due to the presence of cohesive interlocking asperities during shearing, which suggest that rougher fractures are difficult to reactivate. (2) Rough fracture surfaces show velocity strengthening behavior in the initial shearing stage and their strengthening behaviors evolve to velocity neutral and velocity weakening with greater displacement, which means that rough fractures become less stable with shearing (3) The surface roughness exerts a dominant control on permeability evolution over the entire shearing history. Permeability evolves monotonically for smooth fractures but in a fluctuating pattern for highly roughened fractures. A higher roughness is likely to result in more cycling between compaction and dilation during shearing. Significant permeability reduction may occur for rough samples when asperities are highly worn with wear products clogging flow paths. (4) There is no conspicuous correlation between permeability evolution and frictional behavior for rough fracture samples when fractures are subject to sudden sliding velocity change. These lab-scale experimental results reveal the role of rock surface topography in understanding the reactivation and permeability development of fractures.

Original languageEnglish (US)
StatePublished - Jan 1 2019
Event53rd U.S. Rock Mechanics/Geomechanics Symposium - Brooklyn, United States
Duration: Jun 23 2019Jun 26 2019

Conference

Conference53rd U.S. Rock Mechanics/Geomechanics Symposium
CountryUnited States
CityBrooklyn
Period6/23/196/26/19

Fingerprint

roughness
permeability
Surface roughness
shear
shearing
Shearing
asperity
effect
plugging
dilation
Surface topography
surface roughness
reactivation
locking
sliding
compaction
topography
Compaction
Rocks
Wear of materials

All Science Journal Classification (ASJC) codes

  • Geochemistry and Petrology
  • Geophysics

Cite this

Fang, Y., Elsworth, D., Ishibashi, T., & Zhang, F. (2019). Effects of roughness on permeability evolution and frictional behavior of fractures under shear. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.
Fang, Y. ; Elsworth, D. ; Ishibashi, T. ; Zhang, F. / Effects of roughness on permeability evolution and frictional behavior of fractures under shear. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.
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Fang, Y, Elsworth, D, Ishibashi, T & Zhang, F 2019, 'Effects of roughness on permeability evolution and frictional behavior of fractures under shear', Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States, 6/23/19 - 6/26/19.

Effects of roughness on permeability evolution and frictional behavior of fractures under shear. / Fang, Y.; Elsworth, D.; Ishibashi, T.; Zhang, F.

2019. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.

Research output: Contribution to conferencePaper

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AU - Zhang, F.

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N2 - Our experiments investigate the role of roughness in fracture permeability and frictional behavior using artificial fractures with controlled roughness. The results show that (1) Rougher surfaces indicate higher frictional stability and frictional strength due to the presence of cohesive interlocking asperities during shearing, which suggest that rougher fractures are difficult to reactivate. (2) Rough fracture surfaces show velocity strengthening behavior in the initial shearing stage and their strengthening behaviors evolve to velocity neutral and velocity weakening with greater displacement, which means that rough fractures become less stable with shearing (3) The surface roughness exerts a dominant control on permeability evolution over the entire shearing history. Permeability evolves monotonically for smooth fractures but in a fluctuating pattern for highly roughened fractures. A higher roughness is likely to result in more cycling between compaction and dilation during shearing. Significant permeability reduction may occur for rough samples when asperities are highly worn with wear products clogging flow paths. (4) There is no conspicuous correlation between permeability evolution and frictional behavior for rough fracture samples when fractures are subject to sudden sliding velocity change. These lab-scale experimental results reveal the role of rock surface topography in understanding the reactivation and permeability development of fractures.

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Fang Y, Elsworth D, Ishibashi T, Zhang F. Effects of roughness on permeability evolution and frictional behavior of fractures under shear. 2019. Paper presented at 53rd U.S. Rock Mechanics/Geomechanics Symposium, Brooklyn, United States.