Manuel Rocha Medal Recipient Shear Strength of Rock Joints Based on Quantified Surface Description

Grasselli, Giovanni

doi:10.1007/s00603-006-0100-0

Cited by 210 publications

(116 citation statements)

References 33 publications

Supporting

Mentioning

109

Contrasting

Unclassified

Order By: Relevance

“…Some previous articles (Vásárhelyi 1999;Grasselli 2001) which dealt with direct shear tests attempted to outline rules to explain the shear properties of artificial rock surfaces. The results of these investigations provide similar examples, where the relationship between shear stress and normal stress values was established.…”

Section: Interpretation and Discussionmentioning

confidence: 99%

“…The sheared surface is better modeled when the surface is scanned in 3D. Grasselli (2001) used an ATR scanner to map the surface irregularities and outlined a new formula that better explains the relationship between JRC and shear strength for rocks of various lithologies. A 3D direct shear box (BCR3D) was used to test the calcite discontinuities in granodioritic rock of Central France that hosts a nuclear waste storage facility.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laboratory determination of direct shear strength of granitoid rocks; examples from the host rock of the nuclear waste storage facility of Bátaapáti (Hungary)

Buocz¹,

Rozgonyi-Boissinot²,

Görög³

et al. 2010

Central European Geology

View full text Add to dashboard Cite

This paper provides test results and interpretation of the shear strength of granitic rocks. The samples were obtained from Bátaapáti (South Hungary), where the low and medium-activity nuclear waste storage facility of Hungary is under construction. The experiments were carried out under laboratory conditions by using direct shear strength tests of samples drilled and cut from larger granitic blocks. The friction angles of both the maximal and residual shear stress, as well as the cohesion, were detected for various joint systems and also for the cut surface of the granitic rock. The interpretation of test results includes the evaluation of normal stress versus shear strength for cut, moderately rough, rough and calcite-filled joints. The tests have demonstrated that the average internal angle of friction for granitic rocks exceeds 20°, with a maximum of 39° for rough surfaces. Calcite-filled joints have lower friction angles, in the range of 16-23°. The peak shear strength of granitic test specimens was between 0.8 and 4.1 MPa, depending on the surface and joint fill.

show abstract

Section: Interpretation and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laboratory determination of direct shear strength of granitoid rocks; examples from the host rock of the nuclear waste storage facility of Bátaapáti (Hungary)

Buocz¹,

Rozgonyi-Boissinot²,

Görög³

et al. 2010

Central European Geology

View full text Add to dashboard Cite

show abstract

“…Most morphological reconstructions of fracture surfaces are realized by the 3D wireframe (curved rectangle) model (Belem et al 2000;Zhang et al 2009) or TIN model (Belem et al 2000;Grasselli 2001;Cottrell 2009;Grasselli and Egger 2003;Lee et al 2011;Tang et al 2012). Elements of the 3D wireframe or TIN have their own physical properties including dip angle, dip direction, height, area, etc.…”

Section: Literature Reviewmentioning

confidence: 99%

“…Grasselli (2001) rebuilt the fracture surface by TIN and took apparent dip angle (θ * ) of the elements against shearing direction and potential area ratio (A θ* ) of TIN elements to describe the roughness of fracture surface. The area ratio is given by A θ* = A pi / A t , where A pi is the total area of triangular elements against the shear direction with apparent slopes larger than θ * and A t is the actual area of the …”

Section: Literature Reviewmentioning

confidence: 99%

See 1 more Smart Citation

Estimating the three-dimensional joint roughness coefficient value of rock fractures

2017

Bull Eng Geol Environ

View full text Add to dashboard Cite

Measurement and estimation of the joint roughness coefficient (JRC) is a critical but also difficult challenge in the field of rock mechanics. Parameters for estimating JRC based on a profile derived from a fracture surface are generally twodimensional (2D), where a single or multiple straight profiles derived from a surface cannot reflect the roughness of the entire surface. It is therefore necessary to derive the threedimensional (3D) roughness parameters from the entire surface. In this article, a detailed review is made on 3D roughness parameters along with classification and discussion of their usability and limitations. Methods using Triangulated Irregular Network (TIN) and 3D wireframe to derive 3D roughness parameters are described. Thirty-eight sets of fresh rock blocks with fractures in the middle were prepared and tested in direct shear. Based on these, empirical equations for JRC estimation using 3D roughness parameters have been derived. Nine parameters (θ s , θ g , θ 2s , S sT , S sF , V an , Z sa , Z rms , and Z range ) are found to have close correlations with JRC and are capable of estimating JRC of rock fracture surfaces. Other parameters (Z ss , Z sk , V svi , V sci , S dr and S ts ) show no good correlations with JRC. The sampling interval has little influence when using volume and amplitude parameters (V an , Z sa , Z rms , and Z range ) for JRC estimation, while it influences to some extent when other parameters (θ s , θ g , θ 2s , S sT and S sF ) are used. For their easy calculation, the equations with amplitude parameters are recommended to facilitate rapid estimation of JRC in engineering practice.

show abstract

A review of mechanical deformation and seepage mechanism of rock with filled joints

Yue,

Li,

Liu

et al. 2024

Deep Underground Science and Engineering

View full text Add to dashboard Cite

Various defects exist in natural rock masses, with filled joints being a vital factor complicating both the mechanical characteristics and seepage mechanisms of the rock mass. Filled jointed rocks usually show mechanical properties that are weaker than those of intact rocks but stronger than those of rocks with fractures. The shape of the rock, filling material, prefabricated fissure geometry, fissure roughness, fissure inclination angle, and other factors mainly influence the mechanical and seepage properties. This paper systematically reviews the research progress and findings on filled rock joints, focusing on three key aspects: mechanical properties, seepage properties, and flow properties under mechanical response. First, the study emphasizes the effects of prefabricated defects (shape, size, filling material, inclination angle, and other factors) on the mechanical properties of the rock. The fracture extension behavior of rock masses is revealed by the stress state of rocks with filled joints under uniaxial compression, using advanced auxiliary test techniques. Second, the seepage properties of rocks with filled joints are discussed and summarized through theoretical analysis, experimental research, and numerical simulations, focusing on organizing the seepage equations of these rocks. The study also considers the form of failure under stress–seepage coupling for both fully filled and partially filled fissured rocks. Finally, the limitations in the current research on the rock with filled joints are pointed out. It is emphasized that the specimens should more closely resemble real conditions, the analysis of mechanical indexes should be multi‐parameterized, the construction of the seepage model should be refined, and the engineering coupling application should be multi‐field–multiphase.

show abstract

Manuel Rocha Medal Recipient Shear Strength of Rock Joints Based on Quantified Surface Description

Cited by 210 publications

References 33 publications

Laboratory determination of direct shear strength of granitoid rocks; examples from the host rock of the nuclear waste storage facility of Bátaapáti (Hungary)

Laboratory determination of direct shear strength of granitoid rocks; examples from the host rock of the nuclear waste storage facility of Bátaapáti (Hungary)

Estimating the three-dimensional joint roughness coefficient value of rock fractures

A review of mechanical deformation and seepage mechanism of rock with filled joints

Contact Info

Product

Resources

About