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Monday, August 3, 2020 | History

2 edition of Estimation of shear strength using fractals as a measure of rock fracture roughness found in the catalog.

Estimation of shear strength using fractals as a measure of rock fracture roughness

P. C. McWilliams

Estimation of shear strength using fractals as a measure of rock fracture roughness

by P. C. McWilliams

  • 60 Want to read
  • 23 Currently reading

Published by U.S. Dept. of the Interior, Bureau of Mines in Washington, D.C .
Written in English

    Subjects:
  • Rocks -- Fracture.,
  • Rock mechanics.

  • Edition Notes

    Includes bibliographical references (p. 25-26).

    Statementby P.C. McWilliams, J.C. Kekering, and S.M. Miller.
    SeriesReport of investigations ;, 9447, Report of investigations (United States. Bureau of Mines) ;, 9447.
    ContributionsKekering, J. C., Miller, S. M.
    Classifications
    LC ClassificationsTN23 .U43 no. 9447, TA706 .U43 no. 9447
    The Physical Object
    Paginationii, 36 p. :
    Number of Pages36
    ID Numbers
    Open LibraryOL1720475M
    LC Control Number92023708

    Geostatistical modeling of rock fracture surface and simulation of shear tests e CDGA-Universitd Bordeaux I, Av. des Facultds, Talence Cedex, France the roughness of a joint is a key element for the understanding of its hydromechani- The estimation is done by using either kriging or conditional simulation. Roughness affects various part characteristics, including the amount of wear, the ability to form a seal when the part makes contact with something, and the ability to coat the part. KEYENCE's Introduction to "Roughness" website introduces parameters and case studies related to such surface measurements.

    23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23) Byron Bay, Australia, December , S.T. Smith (Ed.) ACMSM23 ASSESSMENT OF ROCK JOINT ROUGHNESS USING IMAGE ANALYSIS OF DAMAGED AREA IN DIRECT SHEAR TESTS. Estimation of rock mass stiffness and shear strength parameters is fundamental to the validity of most applied mechanics calculations for rock mechanics design purposes. Estimation of such parameters is very difficult and has to be based on rock mass characterisation. File Size: 1MB.

    The unsaturated shear strength can be easily estimated using the surface fractal dimension and air-entry value, which can be calculated from the soil–water characteristic curves. The unsaturated shear strength obtained from the proposed method is in satisfactory agreement with . roughness and fractal dimension has been discussed pre-viously by Mandelbrot [6]. The paper is organized as follows: Sect. 2 deals with the deflnition of the roughness method as proposed here. Section 3 is devoted to tests performed on the \classical" fractals composed of the hierarchical structures in the sense above deflned.


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Estimation of shear strength using fractals as a measure of rock fracture roughness by P. C. McWilliams Download PDF EPUB FB2

Estimation of shear strength using fractals as a measure of rock fracture roughness (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: P C McWilliams; J C Kekering; S M Miller; United States.

Bureau of Mines. Shear strength estimates were obtained using the parameters of the modified divider method and Myers' Z2 measure. Because of differences in results when comparing the different ways of obtaining the fractal dimension, future users of fractals in studies of rock fractures are advised to.

Get this from a library. Estimation of shear strength using fractals as a measure of rock fracture roughness. [P C McWilliams; J C Kekering; S M Miller]. Title: Estimation of Shear Strength Using Fractals as a Measure of Rock Fracture Roughness Author: pau0 Created Date: 11/13/ PM.

where τ is the peak shear strength of the rock joint, σ is the normal stress, JRC is the joint roughness coefficient, JCS is the strength of joint wall, and φ b is the basic friction angle.

Measurement and estimation of the JRC is critical for using the JRC-JCS model but also a difficult challenge in the field of rock mechanics (Barton and Cited by: 3. The fracture mode of composite materials with higher aggregate strength tends to be an intergranular fracture, which makes the fracture surface more tortuous [12].

Crack extension path directly. Estimation of shear strength using fractals as a measure of rock fracture roughness Book McWilliams, P.C. ; Kerkering, J.C. ; Miller, S.M. Researchers at the Bureau of Mines investigated the use of close-range photogrammetry and subsequent stereo digitizing to obtain data from rock.

Rock joint roughness influence the shear behavior of rock joints, which have been extensively studied in last a few decades. Various parameters were recommended to quantify the joint roughness, in. The book is mainly concerned with these developments, as related to fractal descriptions of fragmentations, damage and fracture of rocks, rock burst, joint roughness, rock porosity and permeability, rock grain growth, rock and soil particles, shear slips, fluid flow through jointed rocks, faults, earthquake clustering, and so on.

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 two-dimensional (2D), where a single or multiple straight profiles derived from a surface cannot reflect the roughness of the entire by: 3.

Fracture surface texture is a major focus of fractography. It is commonly recognized that the roughness of the fracture surface of concrete can vary depending on the mix design. High-strength concrete often exhibits brittle behavior, and cracks propagate directly through the by: catalog results RSS feed for this result.

1 - 20 Next. View results as: View 50 per page; per page; Select all Unselect all. Estimation of shear strength using fractals as a measure of rock fracture roughness [] McWilliams, P. (Paul C.). The primary objective of this study is to develop a parameter with a clear physical meaning to estimate the surface roughness of rock discontinuities.

This parameter must be closely related to the shear strength of rock discontinuities. The first part of this study focuses on defining and computing this parameter. The estimation formula for the shear strength of a triangle within a Cited by: 1. Roughness profiles of fracture surface for test, plotted for fractal dimension calculation.

recommended that further empirical work is needed to find the relation without using the JRC value. The author expects a new criterion can be established for the peak shear strength of rock joints with further exper- imental and empirical by: study of the peak shear strength of rock fractures.

The shear strength is the controlling factor of failure modes such as sliding on the fracture surfaces. The mechanical properties of a fracture govern the shear strength but they are time and cost demanding to determine in-situ. Moreover, the normal and shear behaviour of rock fractures needs.

The book is mainly concerned with these developments, as related to fractal descriptions of fragmentations, damage and fracture of rocks, rock burst, joint roughness, rock porosity and permeability, rock grain growth, rock and soil particles, shear slips, fluid flow through jointed rocks, faults, earthquake clustering, and so : Heping Xie.

Estimation of shear strength using fractals as a measure of rock fracture roughness [microform] / by P. Estimation of shear strength using fractals as a measure of rock fracture roughness [microform] / by P.C An introduction to the rock-forming minerals / [by] W.

Deer, R. Howie, [and] J. Zussman. an empirical equation to estimate the peak shear strength of a rock joint τ¼σ tan ½JRClogðJCS=σÞþφ b, where τ is the peak shear strength of the rock joint, σ is the normal stress, JRC is the joint roughness coefficient, JCS is the strength of joint wall, and φ b is the basic friction angle.

The. fracture roughness. It smoothes the surface: slight increase of the roughness exponent. Gouge particles extracted from the shear band present a power law distribution with an exponent ranging from to This exponent appears to increase with the shearing displacement and the confining pressure.

When a significant shear of the band is Cited by: The Effect Of Joint Roughness Coeffici ent On Shear Strength Of Granite Intan Nur Mardia Arifa binti Sa’ad1, Mohd For bin Mohd Ami 1 1Faculty of Civil Engineering, Universiti Teknologi Malaysia, Malaysia a*[email protected] Keywords: Joint roughness, Granite, Rock Mass, Shear Strength Abstract.A natural discontinuity surface in hard rock is never as smooth as normally used inFile Size: KB.

Fracture roughness and gouge distribution of a granite shear band the fracture roughness is measured along parallel profiles and shown to be correctly described over up to 3 orders of take into account the scale effect observed for the shear strength of rock surfaces (the strength decreases as the scale increases[seeBartonandChoubey.Physical Properties and Fundamental Processes in Fractures T o build predictive models and understand the behavior of complex fracture systems it is necessary to understand the behavior of a single fracture under the same in situ conditions imposed on the whole system.(Walker, John) slope = The theory of roughness is an idea that physical roughness can be explained/measured through geometry.

roughness Cantor Dust discovered by Benoit Mandelbrot Fractals are iterative, natural, self-similar patterns Found in cauliflower, coastlines.