Last edited by Taur
Monday, July 27, 2020 | History

2 edition of rock drillability index found in the catalog.

rock drillability index

Christopher George White

rock drillability index

by Christopher George White

  • 295 Want to read
  • 14 Currently reading

Published by Colorado School of Mines in Golden .
Written in English

    Subjects:
  • Rocks -- Testing.,
  • Boring.

  • Edition Notes

    Bibliography: p. 91-92.

    Statementby C. G. White.
    SeriesQuarterly of the Colorado School of Mines, v. 64, no. 2, Quarterly of the Colorado School of Mines ;, v. 64, no. 2.
    Classifications
    LC ClassificationsTN210 .C68 vol. 64, no. 2
    The Physical Object
    Paginationiv, 92 p.
    Number of Pages92
    ID Numbers
    Open LibraryOL5020683M
    LC Control Number76630098

    The effect of mechanical rock properties and brittleness on drillability, ISSN , Academic Journals •Copur, H., Bilgin, N., Tuncdemir, H. and Balci, C. A set of indices based on indentation tests for assessment of rock cutting performance and rock. Fig. 1: Illustration of the term „drillability“ and the main influencing parameters. First of all, the geological parameters generate the specific characteristics of rock material and rock mass (Fig. 2). Th e-se characteristics may be at least partly put into figures with the help of mechanical rock properties. But rock mass co n-.

      For the Love of Physics - Walter Lewin - - Duration: Lectures by Walter Lewin. They will make you ♥ Physics. Recommended for you. Results: The model revealed the order of the rock parameters affects the wear of the compact as follows: elastic modulus> quartz content> internal friction angle> surface roughness> Poisson's ratio> cohesion. So the evaluation index of rock abrasiveness was established and the grading standard of rock abrasiveness was developed finally.

    This Bureau of Mines report describes the method of obtaining a strength index for rock drillability, particularly for percussion drills. The original protodyakonov method has been slightly modified, essentially to eliminate uncertainties in the measurement of the volume of fines and to avoid conjecture in selecting the representative value as the strength coefficient. Laboratory drillability experiments and instrumentation --Introduction --Measurement of cutting forces --Transducer applications of strain guages --Transducers employing bending stresses --Strain guage torque meters --Design principles of spoked-wheel dynamometer for measurement of thrust and torque during rock drilling --Ch. 7.


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Rock drillability index by Christopher George White Download PDF EPUB FB2

In the present classication system (rock mass drillability index [RDi]), the four following rules have been considered: (a) the number of parameters used should be small, (b) equivalent parameters should be avoided, (c) parameters should be considered within certain groups, and (d) the rock mass classication should be applicable in the eld.5/5(1).

drillability (i.e. rock strength, rock surface hardness, rock brittleness, rock abrasivity or rock petrography). This paper includes a review of the state-of-the-art and discussion of relevant. Try the new Google Books. Check out the new look and enjoy easier access to your favorite features.

Try it now. No thanks. Try the rock drillability index book Google Books Get print book. No eBook available A rock drillability index. Christopher George White. Colorado School of Mines, - Nature.

In last article, the rock property was introduced, here we will give the introduction of rock drillability. Rock Mechanical Classification.

Rock Properties that have an overall effect on the drillability are as following: Hardness; Abrasiveness.

Bhawani Singh, R.K. Goel, in Engineering Rock Mass Classification, Drillability and affecting parameters. The rock drillability or speed of drilling for a blasthole and rock bolting needs to be estimated to assess the cycle time of tunneling for a given setup of tunneling machines.

Construction time for back grouting and consolidation grouting also depends on the. " A Rock Drillability Index." Rocks & Minerals, 44(7), p.

Article Metrics Views 5. Citations Crossref 2 Web of Science 0 Scopus 0. Altmetric Article metrics information Disclaimer for citing articles.

People also read. Article. Drillability studies on the rotary blasthole drilling of lignite overburden series. Definition of drillability.

These are compiled and normalized in a scale of 1 to 8; value of 1 represents very soft rock and a value of 8 represents hard rock, ideally. The relevant rock properties are roks, porosity, compressional and shear wave velocities, unconfined compressive strength, Mohr friction angle, mineralogy, and grain sizes.

In excavation drillability of the rock has significant effect on the whole operation costs. Already 50 years ago it was proven that drilling rate index has strong relationship with rock drillability (Selmer-Olsen & Blendheim, ).

Drilling rate index is determined based on Siever’s miniature drill test and brittleness test, which describe. characteristics of the rocks vary from extremely low to low drillability based on the Drilling Rate Index (DRI) and drill bit life range from very low to extremely low life span.

Keywords: drillability, strength, characterization, rocks, hardness, schmidt hammer. Introduction. Drillability is the resistance of rock to. The brittleness is a fundamental rock property and effective in drilling and rock excavation. Knowing the relations between the drillability and the brittleness will help the rock engineers.

For this reason, to investigate the relations between the drilling rate index (DRI) and the different brittleness values, 32 different rock types were. Then, a great number of factors, such as rock drillability characterization index, equipment working parameters, bit wear and brittleness, have been considered to measure the drillability of rock.

A rock drillability index by Christopher George White; 1 edition; Subjects: Boring, Rocks, Testing. the drillability index is based on the penetration rate achieved by a 3/4-inch diameter bit drilling a hole 4 inches deep.

a rock abrasive index is also proposed, and is based on the change in area of the bit cutting-edge profile. drillability and abrasive indices have been determined for 98 rock.

A new rating system called Rock Drillability Characterization index (RDCi) is proposed to predict PR for different drilling methods. This drillability model incorporates the uniaxial compressive strength of intact rock, the P-wave velocity and the density of rock.

The RDCi system is further applied to predict PR in the diamond rotary drilling. Rock Drillability. George Exadaktylos. Professor of Rock Mechanics & Mining Engineering, School of Mineral Resources. Engineering, Technical University. The purpose of this paper is to provide a proper, practical and convenient drilling rate index (DRI) prediction model based on rock material.

Empirical parameters, such as drillability index, Goodrich drillability, Morris’ drillability, specific energy test by instrumented cutting, NTH drillability test, direct cutting testing, etc Mechanical rock properties, such as Young’s modulus, destruction work, brittleness of rock, elastic/plastic properties influenced by many variables.

rock, one can then replace SE by the term: [3] Rock drillability prediction from in situ determined unconfined compressive strength of rock by V.C. Kelessidis* Synopsis The interaction between rock and drill bit during drilling has been modeled for many years, but a complete understanding of the phenomena occurring has yet to materialize.

Additional Physical Format: Online version: White, Christopher George, Rock drillability index. Golden, Colorado School of Mines, (OCoLC) between hammer rebound and rock properties, such as drillability. In fact, a good and approximately linear relationship between hammer rebound and a rock im-pact resistance index is the prerequisite for using hammer rebound to create a rock drillability index.

This paper theoretically analyzes the hammer rebound in the. The purpose of this paper is to provide a proper, practical and convenient drilling rate index (DRI) prediction model based on rock material properties. In order to obtain this purpose, 47 DRI tests were used.

In addition, the relevant strength properties i.e. uniaxial compressive strength and Brazilian tensile strength were also used and selected as input. Purchase Rock Mass Classification - 1st Edition. Print Book & E-Book. ISBNThe rock unit is the basic mapping unit for the rock material field classification (RMFC) system.

It is de-fined as a body of rock that is identified in the field and mapped according to measurable or otherwise describable physical properties or features at a scale useful for project analysis.

A rock unit is consistent in its mineralogical composi.Rock mass classification methods are commonly used at the preliminary design stages of a construction project when there is very little information.

It forms the bases for design and estimation of the required amount and type of rock support and groundwater control measures. Encompassing nearly all aspects of rock mass classifications in detail, Civil Engineering Rock 4/5(2).