Relationship between grain size and some surface roughness parameters of rock joints

Kabeya, K.K.; Legge, T. Francis H.

doi:10.1016/s1365-1609(97)00186-x

Cited by 12 publications

(7 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Due to the small number of test ranges, this cannot be generalised here, but it could explain the high stiffness values adopted during numerical modelling. On the basis of the analysis Similar conclusions were drawn by Kabeya and Legge (1997), claiming that values of internal friction angle and joint surface roughness depended on rock grain size. In order to test this thesis for all sandstone specimens, analysis was performed on the slices specially prepared for this purpose, with the help of polarisation microscope.…”

Section: Authorssupporting

confidence: 79%

Behaviour of joints in sandstanes during the shear test

Małkowski¹

2015

Acta Geodynamica Et Geomaterialia

View full text Add to dashboard Cite

In the case of soft rocks, with many beds, or subjected to tectonic tensions, fractures with the separation occur, which cause many problems to the quantitative assessment of their properties. Considering the fact that deformation properties are proportionate to the strength properties also in the case of rocks, measurement of shear stresses can become the basis for quantitative assessment of mechanical properties of rocks joints, in particular as regards their shear stiffness. In the article, the author has presented the results of laboratory studies of shear behaviour of rock joints in Carboniferous sandstones: fine-and medium grained during a shear test. He has presented the values of internal friction angle, cohesion, shear stiffness at the rock joints, as well as joint roughness coefficient. All the tests were carried out at low stresses with the help of direct shear test. The results show that the internal friction angle of fractured sandstones and of intact ones tested at low stress (up to 10 MPa) is similar. Shear stiffness K s of joints grows up with the normal stress and correspond with the shifting on the discontinuity. For the low normal stresses K s was obtained as follows: 320 MPa/m, 353 MPa/m and 418 MPa/m. The joint roughness coefficient (JRC) for the fine-grained sandstone amounts to 5 to 7, while for medium-grained sandstone-6 to 8. This conclusion can be very useful for geological or engineering designing (eg. mining workings support design, underground roadways stability assessment, rock mass classification) when evaluate the shear resistance between sandstone rock blocks.

show abstract

Section: Authorssupporting

confidence: 79%

Behaviour of joints in sandstanes during the shear test

Małkowski¹

2015

Acta Geodynamica Et Geomaterialia

View full text Add to dashboard Cite

show abstract

“…In particular, the evolution of the joint condition is dramatic on the surface of the weathered rock whose material integrity is altered in a manner similar to the rock joint behavior from weathering effects (Resende et al 2010). As indicated in Kabeya and Legge (1997), a significant change in the weathered rock joint surface can be induced by the modification of grain properties of the joint surface. The grain size distribution has been found to be strongly correlated with the shear behavior and the joint roughness coefficient (JRC).…”

Section: Introductionmentioning

confidence: 97%

Evolution of Joint Roughness Degradation from Cyclic Loading and Its Effect on the Elastic Wave Velocity

et al. 2015

View full text Add to dashboard Cite

“…), so the range of aperture size was within the range of grain size. We assumed that the grain size of gouge would influence the hydraulic aperture, and an increase of grain size would increase surface roughness, which increases fracture transmissivity and shear strength (Kabeya & Legge ). The grain size of gouge produced was independent of slip rate, although wear production rate increased with slip velocity (Fig.…”

Section: Discussionmentioning

confidence: 99%

Permeability changes in simulated granite faults during and after frictional sliding

Tanikawa

Tadai²,

Mukoyoshi

2014

Geofluids

View full text Add to dashboard Cite

Thermal-hydrological-mechanical coupling processes suggest that fault permeability should undergo dynamic change as a result of seismic slip. In igneous rocks, a fault's slip surface may have much higher permeability than the surrounding rock matrix and therefore operate as a conduit for fluids. We conducted laboratory experiments to investigate changes in fracture permeability (or transmissivity) of a fault in granite due to shear slip and cyclic heating and cooling. Our experiments showed that high initial fracture transmissivity (>10 À18 m 3 ) was associated with a high friction coefficient and that transmissivity decreased during slip. We propose that this reduction in transmissivity reflects the presence of gouge in fracture voids, increasing the area of contact in the fault plane and reducing the hydraulic aperture. In contrast, when initial fracture transmissivity was low (<10 À18 m 3 ), we observed that friction was lower and transmissivity increased during slip. The high transmissivity and high friction may be explained by large areas of bare rock being in contact on the slip surface. Slip velocity had little influence on the evolution of permeability, probably because gouge produced at different slip velocities had similar grain size distributions, or because gouge leaked from the slip surface. Transmissivity decreased with increasing temperature in heating tests, probably due to thermal expansion increasing normal stress on the fracture. Frictional heating did not influence transmissivity during the shearing tests.

show abstract

Relationship between grain size and some surface roughness parameters of rock joints

Cited by 12 publications

References 4 publications

Behaviour of joints in sandstanes during the shear test

Behaviour of joints in sandstanes during the shear test

Evolution of Joint Roughness Degradation from Cyclic Loading and Its Effect on the Elastic Wave Velocity

Permeability changes in simulated granite faults during and after frictional sliding

Contact Info

Product

Resources

About