Last edited by Fenrijin
Saturday, July 25, 2020 | History

7 edition of Tensile fracturing in rocks found in the catalog.

Tensile fracturing in rocks

tectonofractographic and electromagnetic radiation methods

by Dov Bahat

  • 248 Want to read
  • 28 Currently reading

Published by Springer in Berlin, New York .
Written in English

    Subjects:
  • Rocks -- Fracture,
  • Granite outcrops -- Fracture,
  • Geology, Structural,
  • Fractography,
  • Rocks -- Testing,
  • Electromagnetic waves

  • Edition Notes

    StatementDov Bahat, Avinoam Rabinovitch, Vladimir Frid.
    Classifications
    LC ClassificationsQE601.2 .B34 2005
    The Physical Object
    Paginationxiv, 569 p. :
    Number of Pages569
    ID Numbers
    Open LibraryOL3315174M
    ISBN 103540214569
    LC Control Number2004108439
    OCLC/WorldCa55514470

    Summary. Hydraulic fracturing is crucial to hydrocarbon recovery from resource plays and is essential to exploitation of geothermal energy. This process creates new tensile fractures and reactivates existing natural fractures, forming a highly conductive stimulated-reservoir volume (SRV) around the borehole. Tensile failure Crack propagation Griffith theory HoekeBrown criterion Tension cutoff Crack coalescence Numerical models abstract The initiation and propagation of failure in intact rock are a matter of fundamental importance in rock engineering. At lowconfining pressures, tensile fracturing initiates in samples at 40%e60% of the uniaxial.

    Tensile strength = resistance to failure under tensile stress! Typically much lower than compressive strength • 10% of compressive strength typical (Table )! Horizontal rock beams can be dangerous because of the weak tensile strength – rock unit must be homogeneous and composed of .   A review of the tensile strength of rock was conducted to determine the relationship between direct tensile strength (DTS) and Brazilian tensile strength (BTS) and to examine the validity of estimating tensile strength from other measured properties, such as the crack initiation (CI) threshold. A data set was gathered from the existing literature where tensile values could be reliably.

    1-F Rock Strength Chalk Fracture Experiments a. Three-point loading 2P P P Tensile stress Compressive stress Surface of fracture Fracture location directly under 2P b. Four-point loading P P P Tensile stress Compressive stress Surface of fracture Fracture location indeterminate, but between the two vertical loads P d. Pure torsion (moment. Mechanics. Fracturing rocks at great depth frequently becomes suppressed by pressure due to the weight of the overlying rock strata and the cementation of the formation. This suppression process is particularly significant in "tensile" fractures which require the walls of the fracture to move against this ring occurs when effective stress is overcome by the pressure of fluids.


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Tensile fracturing in rocks by Dov Bahat Download PDF EPUB FB2

‘Tensile Fracturing in Rocks’ presents field observations on fracturing of sedim- tary rocks and granite outcrops from various provinces in three continents. It also combines results of recent experiments conducted at different laboratories around the world with current theories on fracturing.

In treating faults, this book limits itself to Cited by: ‘Tensile Fracturing in Rocks’ presents field observations on fracturing of sedim- tary rocks and granite outcrops from various provinces in three continents.

It also combines results of recent experiments conducted at different laboratories around the world with current theories on fracturing. ‘Tensile Fracturing in Rocks’ presents field observations on fracturing of sedim- tary rocks and granite outcrops from various provinces in three continents.

It also combines results of recent experiments conducted at different laboratories around the world with current theories on fracturing. In treating faults, this book limits itself to faults that are associated with joint sets.

‘Tensile Fracturing in Rocks’ presents field observations on fracturing of sedim- tary rocks and granite outcrops from various provinces in. Book Annex Membership Educators Gift Cards Stores & Events Help Auto Suggestions are available once you type at least 3 letters.

Use up arrow (for mozilla firefox browser alt+up arrow) and down arrow Price: $ Buy Tensile Fracturing in Rocks (): Tectonofractographic and Electromagnetic Radiation Methods: NHBS - D Bahat, A Rabinovitch and V Frid, Springer Nature.

‘Tensile Fracturing in Rocks’ presents field observations on fracturing of sedim- tary rocks and granite outcrops from various provinces in three continents. It also combines results of recent experiments conducted at different laboratories around the world with current theories on fracturing.

`Tensile Fracturing in Rocks' presents field observations on fracturing of sedim- tary rocks and granite outcrops from various provinces in three continents. It also combines results of recent experiments conducted at different laboratories around the world with current theories on fracturing.

Tensile strength tests are widely applied in rock mechanics to obtain input parameters for planning of hydraulic fracturing on all scales. In literature only few experimental data sets are published dealing with samples size effects on tensile strength tests [1,2] or the comparison of different tensile tests in general [1,3].Usually, results of laboratory tensile tests are taken to be size.

Browse your favourite books and read Tensile Fracturing in Rocks: Tectonofractographic and Electromagnetic Radiation Methods PDF them free in your e-reader. Our library add to their collections from a catalog of over 2 million eBooks.

Start exploring to see what's out there. Rock mass in situ often bears different confining pressures. As we have known from the chapter: Environmental Effects on Rock Fracture, both rock fracture toughness and rock strengths are strongly dependent on the confining pressure.

No matter which failure criterion (eg, maximum tensile stress criterion or stress intensity factor criterion) is.

Rocks contain many pre-existing cracks where development of tensile fracture, or Mode I fracture, may be examined. The first form is in axial stretching. In this case a remote tensile stress, σ n, is applied, allowing microcracks to open slightly throughout the tensile these cracks open up, the stresses at the crack tips intensify, eventually exceeding the rock strength and allowing.

Observations of Tensile Fracturing of Anisotropic Rocks Article (PDF Available) in SPE Journal January with Reads How we measure 'reads'. Understanding tensile fracture in rocks provides an important key for the interpretation of many problems in structural geology.

This book presents a multidisciplinary approach to tensile fracture in rocks (faulting is briefly addressed), starting with an introduction to fracture physics and progressing through tectonofractographic features, characterized both in experimental settings and in. Breakdown pressure of the rock is a function of their tensile strength and in situ stresses acting on them.

Fracturing stimulation techniques become challenging when treating these types of rocks, and many cases approached to the operational limits. This leaves a small operational window to initiate and place hydraulic fractures.

Understanding tensile fracture in rocks provides an important key for the interpretation of many problems in structural geology. This book presents a multidisciplinary approach to tensile fracture in rocks (faulting is briefly addressed), starting with an introduction to fracture physics and progressing through tectonofractographic features, characterized both in experimental settings and in.

1. Introduction. Understanding dynamic behaviours of rocks is of significance in many areas such as rock breakage, blasting, planetary collision and prevention from projectile research on mechanical properties of rocks manifest the brittle materials will experience strong rate sensitivity in rupturing strength once the dynamic fracturing of pre-existed defects is mobilized.

Tensile Fracturing in Rocks Understanding tensile fracture in rocks provides an important key for the interpretation of many problems in structural geology. This book presents a multidisciplinary approach to tensile fracture in rocks (fault-ing is only briefly addressed), starting with an introduction to fracture.

Observations of Tensile Fracturing of Anisotropic Rocks SaiedMighani,MassachusettsInstituteofTechnology;Carl H. Sondergeld and Chandra. Fractures and Fracturing. copyright by Philip A. Candela, _____ Fractures in the elastic-brittle crust. Fractures in rocks are surfaces or narrow zones of structural discontinuity (loss of cohesion) that are the product of mechanical rupture.

Hydraulic fracturing can be considered as a technique to overcome the strength of a rock mass in situ, initiation and propagation of a crack through a system of pre-existing fractures, essentially planar discontinuities (e.g., bedding planes), and intact rock.

In examining the fracture propagation process, the pioneering work of Griffith (. The resistance of rock to tensile fracture may be measured by its fracture energy G I, which is found to range from 40 to J/m 2 in tests on nine types of sedimentary and crystalline rock.

Differences in microstructure among the rocks tested are the principal cause of differences in the steady state value of G I, in the distance that a crack must advance before steady state fracturing is.Understanding hydraulic fracturing mechanisms in heterogeneous laminated rocks is important for designing and optimizing well production, as well as for predicting shale gas production.

In this study, a micromechanics-based numerical approach was used to understand the physical processes and underlying mechanisms of fracking for different strata orientations, in-situ stresses, rock strengths.

This book forms the Proceedings of the International Conference held in Vienna in November dealing with ageing, fatigue and fracture of concrete and concrete structures.

Special sections cover demolition and recycling, and anchorage engineering. As well as selected international contributions, five specially invited plenary papers are included from Austria, Spain, Japan, Denmark .