Reconnaissance des massifs rocheux par la petite sismique

Schneider, Berenice

doi:10.1007/bf02591261

Cited by 3 publications

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“…The "petite sismique" technique was developed and validated in France [34,47]. Further validation was obtained on large South African projects [8].…”

Section: S U M M a R Y --C O N C L U S I O N Smentioning

confidence: 99%

Scale effects in the determination of rock mass strength and deformability

Heuzé

1980

Rock Mechanics

161

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Summary --Z u s a m m e n f a s s u n g --Rdsum~ ,Scale Effects in the Determination o[ Rock Mass Strength and Deformability.An extensive literature search was conducted, to investigate the effect of the scale of testing on the measurement of strength and stiffness of rock masses. The results are presented for bearing capacity tests, compression tests, and several types of deformability tests.Field strength values are generally several times smaller than laboratory values. Field moduli generally appear to be between 20 per cent to 60 per cent of laboratory measured moduli.All strength and deformability results reviewed point to the great need for more field tests. Specific suggestions are given. Maflstabeffekte bei der Bestimmung mechanischer Eigenscha[ten yon Fels.Ein eingehendes Literamrstudium wurde durchgef/ihrt, um den Maf~stabeffekt auf die Festigkeits-und Verformbarkeitsmessungen im Fels zu untersuchen. Es werden Resultate von Plattendruckversuchen, Druckversuchen und mehreren Verformungsversuchen aufgeffihrt. Die in-situ gemessene Festigkeit ist im allgemeinen ein Bruchteil derjenigen, die bei Laborversuchen festgestellt wird. Die Verformbarkeiten in-situ betragen meistens 20 bis 60 Prozent der im Labor erhaltenen Werte. Alle Resultate zeigen, daf~ mehr In-situ-Versuche notwendig sind. Der Autor macht dazu einige Vorschlfige. L'effet d'dchelle dans les mesures de propridt& mdcaniques des massi[s rocheux.On a fait une recherche bibliographique d&ai!lfie, pour &udier l'effet d'&helle sur les mesurcs de r~sistance et de d~formabilitd des masses rocheuses. On pr6sente des rdsultats concernant les essais de r&istance 5 la plaque, les essais de compression, et plusieurs types d'essais de ddformabilit6 en place.Les resistances mesur6es in-situ sont g8n6ralement une fraction de celles mesur6es au laboratoire. Les d6formabilitds mesurdes en place sont gdn&alement entre 20 et 60 pour cent des valeurs au laboratoire.Tous les r&ultats que l'on a examin~ indiquent la n6cessitfi d'effectuer plus d'essais en place. L'auteur offre un certain nombre de suggestions.

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“…The "petite sismique" technique was developed and validated in France [34,47]. Further validation was obtained on large South African projects [8].…”

Section: S U M M a R Y --C O N C L U S I O N Smentioning

confidence: 99%

Scale effects in the determination of rock mass strength and deformability

Heuzé

1980

Rock Mechanics

161

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“…1. The combined data of Schneider (1967) and Bieniawski (1978) as compiled by Heuze etal. (1981) are represented in the figure.…”

Section: Introductionmentioning

confidence: 99%

“…The second part of the experiment consisted of deploying a 12-channel array of geophones and source and the distance. The original papers on the petite sismique technique (Schneider, 1967;Bieniawski, 1978) did not discuss either the spec tral qualities of the source or the dependence of peak frequency on path length. Until these effects can be incorporated into the empirical relation ship in Fig.…”

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confidence: 99%

Petite sismique measurements at the Spent Fuel Test - Climax

Zucca¹

1984

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DISCLAIMERThat rtport WM pnoand M U aoooaat of work tpoajorad by u ajaacy of tk* Uatttd SIMM OmrMMt. Nakkar tlw Uaitad Statai GonraaMat aor uy aMacy tkaraof , aor uy of Mr iiploywi, aikM uy warraary, upraw or aaplM, or HUM uy lajal wbilky or rtooti bitty for UN accaracy, nrwplrtiam, or waftilaaM of uy iaforaMJoa, apparatai, prodact, or proom dheloid. or raprawli tkat in aw wndd aot iafriut privataly owatd rifitt. Rtftraaca Iwraia lo uy ftdlk miuorcial product, prooow, or wrvioo by trada aaaw, traiuiark, nuafactarar, or ottonriat don Mt MCMMrily ooattitaM or imply iU ladoniajiat, raeoa-•wdatioa, or favoriat by tkt UaiM Stum QovaraaMat or uy afwacy iMraof. Tk* viawa aad epjifss ef aatbant i Apr-id bona do aot •lomirily Halt or rolbct tkon of tka UaiM Sum Oowaawat or uy aaaacy tbaraof. LAWRENCE LIVERMORE NATIONAL LABORATORY g]University of California • Livermore, California • 94550 Mr In May 1984, a "petite sismique" estimate of the deformation modulus (E) was carried out at the Spent Fuel Test-Climax (SFT-C) at the Nevada Test Site. The first part of the experiment was to repeat an earlier suite of measurements that were taken before the spent fuel was emplaced to see if any changes had resulted from heating the rock mass. The results of this measurement indicate a decrease in the modulus. However, these results are suspect in view of the findings in the second part of the experiment, which was designed to minimize the effects due to spurious resonances in the source and geophone locations. These effects were thought to bias the earlier measurements. The measurements indicate that the rock acts as a low-pass filter to the propagating wavefield. Furthermore, it is noted that the blow from a hammer is not a purely impul sive source. Therefore, depending on the type of source used and the distance away from the source, a different peak frequency and, hence, E could be measured for the same rock mass. Unless these effects are somohow factored out of a petite sismique survey, the value of E obtained could be severely biased.

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