Core index, a numerical core-logging procedure for estimating rock quality

Ege, John R.

doi:10.3133/cir954

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Calculation Of Rock Ouality _ignation2

Core Samples1

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1993

2009

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Cited by 2 publications

(3 citation statements)

References 7 publications

(6 reference statements)

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“…The CI number for an interval is calculated from an estimate of the joint frequency, core loss, and broken core (defined as core less than 100 mm or 4 in. in length) (Ege, 1983). The equation used to compute the CI is expressed as 39 CI -(broken core + loss + 1/3 joints) x 100 .…”

Section: Calculation Of Rock Ouality _ignationmentioning

confidence: 99%

See 1 more Smart Citation

Fracture analysis and rock quality designation estimation for the Yucca Mountain Site Characterization Project; Yucca Mountain Site Characterization Project

Hardy¹,

Bauer

1993

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Section: Calculation Of Rock Ouality _ignationmentioning

confidence: 99%

“…(5-2) cored interval Based on Equations (5-1) and (5-2), RQD can be derived for each cored interval using the CI and the number of fractures recorded in the CI sheets, provided that the core loggers followed the definition given by Ege (1983) for the broken-core parameter.…”

Section: Calculation Of Rock Ouality _ignationmentioning

confidence: 99%

Fracture analysis and rock quality designation estimation for the Yucca Mountain Site Characterization Project; Yucca Mountain Site Characterization Project

Hardy¹,

Bauer

1993

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“…The Core Index is a method of using core recovery, breakage, and joint data to produce semi-quantitative geomechanical information, including estimates of rock competence and mineability. It is similar to the industry standard "RQD" method, and was developed by the USGS for use at the NTS (Ege, 1987). In …”

Section: Core Samplesmentioning

confidence: 99%

Observations on Faults and Associated Permeability Structures in Hydrogeologic Units at the Nevada Test Site

Prothro¹,

Drellack²,

Haugstad³

et al. 2009

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Observational data on Nevada Test Site (NTS) faults were gathered from a variety of sources, including surface and tunnel exposures, core samples, geophysical logs, and down-hole cameras.These data show that NTS fault characteristics and fault zone permeability structures are similar to those of faults studied in other regions. Faults at the NTS form complex and heterogeneous fault zones with flow properties that vary in both space and time. Flow property variability within fault zones can be broken down into four major components that allow for the development of a simplified, first approximation model of NTS fault zones. This conceptual model can be used as a general guide during development and evaluation of groundwater flow and contaminate transport models at the NTS.iv This page intentionally left blank.

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Core index, a numerical core-logging procedure for estimating rock quality

Cited by 2 publications

References 7 publications

Fracture analysis and rock quality designation estimation for the Yucca Mountain Site Characterization Project; Yucca Mountain Site Characterization Project

Fracture analysis and rock quality designation estimation for the Yucca Mountain Site Characterization Project; Yucca Mountain Site Characterization Project

Observations on Faults and Associated Permeability Structures in Hydrogeologic Units at the Nevada Test Site

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