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ROCK MASS CLASSIFICATION – A CRITICAL EVALUATION OF .

Rock mass classification systems have gained wide attention and are frequently used in rock engineering and design. However, all of these systems have limitations, but applied appropriately and with care they are valuable tools. The paper describes the history of the Q-system that was introduced in 1974, and its later development.

  • Published in: Tunnelling and Underground Space Technology · 2006Authors: Arild Palmstrom · Einar BrochAffiliation: Norwegian University of Science and TechnologyAbout: Rock mechanics · Q factor · Mathematical analysis · Rock mass classificationGet Price

Publication No. FHWA-IF-99-015

This document provides detailed information on design analyses for ground anchored systems. Topics discussed include selection of design earth pressures, ground anchor design, design of corrosion protection system for ground anchors, design of wall components to resist lateral and

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SOCKETING OF BORED PILES IN ROCK

Socketing of Bored Piles in Rock 680 4.2 Based on Shear Strength of Parameters of Rock Shear stress of rock (τ) is a fraction of its unconfined compression strength (τc). τ may be taken either as a linear fraction of τc with coefficients ranging from 0.1 to 0.4 or as a fraction of square root of τc with coefficients ranging from 0.2 to 0.6 ...

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Rock Mass Characterization for Underground Hard Rock .

influence rock mass strength estimation and those that influence engineering design is emphasized. The second part of the paper focuses on the design recommendations based on these systems such as maximum span, opening geometry and support recommendations. The paper concludes with reference to errors that may arise in particular conditions.

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12 State of Practice for the Design of Socketed Piles in Rock

State of Practice For the Design of Socketed Piles in Rock P.J.N. Pelis asc (Eng), MSc (Eng), DIC, DSc(Eng) Partner, Pells Sullivan Meynink Pty. Ltd., Australia Development over the past three decades in design methods for axial and lateral loads on rock Summary socketed piles are summarised.

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Rock Mass Characterization for Underground Hard Rock .

influence rock mass strength estimation and those that influence engineering design is emphasized. The second part of the paper focuses on the design recommendations based on these systems such as maximum span, opening geometry and support recommendations. The paper concludes with reference to errors that may arise in particular conditions.

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Compressive strength of rocks - PetroWiki

Estimating compressive strength. General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C 0). Lithology is commonly derived during log analysis, so m may be estimated (Table 1). What is needed still is an initial measure of rock strength provided by C 0.

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Prediction of Side Resistance in Poor Quality Rock: RQD vs ...

the performance of various design methodologies for predicting the side resistance in poor quality rock. In particular, we looked at the side resistance predicted in poor quality rock from the rock mass strength developed using Rock Quality Designation (RQD) as well as the Geological Strength Index (GSI) developed by Hoek and Brown.

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Perforating design - PetroWiki

Special considerations, such as ultrahigh compressive strength rock (> 30,000 psi UCS), require special charges. ... Well design should allow for flexibility in the completion type, which allows for adding perforation density in a zone or perforating other zones after the well has been evaluated or produced. Perforator phasing.

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SOCKETING OF BORED PILES IN ROCK

Socketing of Bored Piles in Rock 680 4.2 Based on Shear Strength of Parameters of Rock Shear stress of rock (τ) is a fraction of its unconfined compression strength (τc). τ may be taken either as a linear fraction of τc with coefficients ranging from 0.1 to 0.4 or as a fraction of square root of τc with coefficients ranging from 0.2 to 0.6 ...

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Rock Mass Strength Gibson Rev 2 - SRK

Rock Mass Strength derived from Rock Mass Characterization Gibson, W H, SRK Consulting, Perth, Western Australia, Australia Updated version of the paper published in the Journal of Australian Geomechanics Vol 41 No March 2006 ABSTRACT: The assessment of rock mass strength is a key element for the analysis of many rock excavations, both open

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How Do You Design A Rock Socket? - Earth retention ...

Nov 16, 2003 · I would think if the rock was intact with excellent quality (80%+RQD)and the H Pile socket was filled solid with concrete, the encased portion design loads would like perhaps a typical "fixed end" connection. Basically, Uniform Varying Triangular Intensities. The sloping high points would of course would be on the opposite sides from each other.

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SPREAD FOOTINGS ON ROCK - WV Department of Transportation

Once the footing has been initially sized, bedrock strength parameters and bearing resistance should be calculated based on the Rock Mass Rating (RMR) system as follows: The RMR should be in accordance with LRFD Bridge Design Specifications, 2012, and not later editions.

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Estimating Rock Mass Strength - BM 1997 02

discussed, with particular application to the design of large scale rock slopes. The report specifically deals with strength estimation for the Aznalcollar open pit mine in Spain. These strength estimates will serve as input to numerical modeling and limit equilibrium analysis of

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Compressive strength of rocks - PetroWiki

Estimating compressive strength. General rock failure criterion can be reduced to a few parameters dependent on lithology (m) and the uniaxial compressive strength (C 0). Lithology is commonly derived during log analysis, so m may be estimated (Table 1). What is needed still is an initial measure of rock strength provided by C 0.

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Prediction of Side Resistance in Poor Quality Rock: RQD vs ...

the performance of various design methodologies for predicting the side resistance in poor quality rock. In particular, we looked at the side resistance predicted in poor quality rock from the rock mass strength developed using Rock Quality Designation (RQD) as well as the Geological Strength Index (GSI) developed by Hoek and Brown.

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Rock mass properties - rocscience

Rock mass properties Introduction Reliable estimates of the strength and deformation characteristics of rock masses are required for almost any form of analysis used for the design of slopes, foundations and

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Design Example 11 APPENDIX A EXAMPLE 11 - CAST-IN .

Design Example 11 GENERAL INFORMATION ... Nominal design values are typically provided in the project-specific geotechnical report. ... load combinations Strength Ia and Extreme Event IIa apply minimum load factors to the vertical loads and maximum load factors to the horizontal loads. To check

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Estimating thestrength ofrock materials - SAIMM

triaxial strength of rock. Toobtain this information, the design en-gineer isprepared tosupply between 2to3rock specimens forthe tests (seeTable II). He isinterested in ... axial compressive strength of rock materials hasbeendeveloped tosuch adegreeofreliability that standard-ized test procedures have been pre-pared7, andtheloading apparatus is ...

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USING THE POINT LOAD TEST TO DETERMINE THE .

USING THE POINT LOAD TEST TO DETERMINE THE UNIAXIAL COMPRESSIVE STRENGTH OF COAL MEASURE ROCK John Rusnak, Director of Geology Peabody Group St. Louis, MO Christopher Mark, Rock Mechanics Team Leader National Institute for Occupational Safety and Health Pittsburgh, PA ABSTRACT Point load testing is used to determine rock strength

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Pillar Strength and Design Methodology for Stone Mines

presents a pillar design methodology that was developed from a study of pillar performance in operating stone mines. Data were collected that describe the rock mass quality, pillar conditions, mining dimensions and intact rock strength. The results showed that current mining practices have resulted in .

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