Geologic and seismic setting pertinent to dam safety review of Duncan Dam

Little, T E; Imrie, A. S.; Psutka, J F

doi:10.1139/t94-107

Cited by 6 publications

(5 citation statements)

References 10 publications

(10 reference statements)

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“…Prior to the start of the CANLEX project, a similar type of detailed field and laboratory investigation was carried out at Duncan Dam to characterize the sandy soil beneath the dam as part of a dam safety review by B.C. Hydro (Little et al 1994). Several of the CANLEX participants were involved in various aspects of this study.…”

Section: Test Sitesmentioning

confidence: 99%

Interpretation of in situ test results from the CANLEX sites

Wride¹,

Robertson²,

Biggar³

et al. 2000

Can. Geotech. J.

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One of the primary objectives of the Canadian Liquefaction Experiment (CANLEX) project was to evaluate in situ testing techniques and existing interpretation methods as part of the overall goal to focus and coordinate Canadian geotechnical expertise on the topic of soil liquefaction. Six sites were selected by the CANLEX project in an attempt to characterize various deposits of loose sandy soil. The sites consisted of a variety of soil deposits, including hydraulically placed sand deposits associated with the oil sands industry, natural sand deposits in the Fraser River Delta, and hydraulically placed sand deposits associated with the hard-rock mining industry. At each site, a target zone was selected and various in situ tests were performed. These included standard penetration tests, cone penetration tests, seismic downhole cone penetration tests (giving shear wave velocity measurements), geophysical (gamma-gamma) logging, and pressuremeter testing. This paper describes the techniques used in the in situ testing program at each site and presents a summary and interpretation of the results.Key words: CANLEX, in situ testing, shear wave velocity, geophysical logging, pressuremeter.

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Section: Test Sitesmentioning

confidence: 99%

Interpretation of in situ test results from the CANLEX sites

Wride¹,

Robertson²,

Biggar³

et al. 2000

Can. Geotech. J.

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show abstract

“…In this part, at first, the contours obtained from the modeling of pore water pressure, vertical and horizontal stress at the end of construction and impounding are presented in Figures (7)(8)(9)(10)(11)(12).…”

Section: Resultsmentioning

confidence: 99%

“…The obtained results helped the dam's engineers to have a better predication of the nonlinear behavior of the failure phenomenon from the result of the settlement in the upstream crust. The pore water pressure, stresses, and settlement are the main parameters for the stability analysis of earth and rock fill dams [12], which have been investigated in this study. Beiranvand and Komasi [13] analyzed the pore water pressure on the Eyvashan earth rockfill dam in the initial impounding by two Plaxis and Geostudio software's.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis and Back Calculation of Embankment Dam Using Monitoring Results (Case Study: Iran-Lurestan Rudbar)

2021

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“…Based on probabilistic analysis, B.C. Hydro staff estimated a peak ground acceleration PGA = 0.12s for an earthquake having an annual probability of exceedance of 1/2000 and considered this to be the MCE event (Little et al 1994). They associated an M 6.5, the maximum credible considered for the region, with this event.…”

Section: Seismicitymentioning

confidence: 99%

“…This paper describes, in general terms, the studies carried out to evaluate the seismic safety of this dam, the results of these studies, and their implications. Details of the various aspects may be found in companion papers by Little et al (1994), Plewes et al (1994), Sego et al (1994), Stewart (1994), and.…”

Section: Introductionmentioning

confidence: 99%

Results and implications of seismic performance studies for Duncan Dam

Byrne¹,

Imrie²,

Morgenstern³

1994

Can. Geotech. J.

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Screening-level studies indicated large zones of the foundation soil beneath Duncan Dam could be triggered to liquefy under the design earthquake, resulting in flow slides that could lead to breaching of the dam. In these studies, estimates of the key soil parameters were obtained from an indirect procedure using penetration tests and Seed's chart, which is based on field experience during past earthquakes together with empirical correction factors for high confining stress and static bias. This is state-of-the-practice procedure in North America and is used because of the difficulty in retrieving and testing undisturbed samples of sand. With the high confining stresses present at the site, the indirect approach gave very low values of the key liquefaction properties of the soil, and the q e of such low values in analyses indicated that major and costly remedial measures were required. Thus a more dire6 approach was undertaken. This involved both direct and semidirect determination of the key soil parameters thrqugh an extensive laboratory study based on testing of undisturbed samples obtained by freezing in situ. The results'$howed that both the triggering resistance and the residual strength values of the soil were very much higher than those obtained from the indirect approach. Analyses carried out using direct measurement of the key soil parameters indicated that the dam, in fact, would be stable.Key ~volz1.s: embankment dam, foundation liquefaction, sand, seismic performance, triggering resistance, undisturbed sample.Des Ctudes prCalabies ont indiquC que d'importantes zones de la fondation du barrage Duncan pouvaient &tre amenCe B se liquefier sous l'effet du sCisme prCvisionne1, avec un glissement de terrain pouvant conduire B la rupture du barrage. Dans ces Ctudes les valeurs estimCes des paramtttres fondamentaux des sols ont CtC obtenues par une procedure indirecte qui utilise des essais de pCnCtration et I'abaque de Seed, bask sur 1'expCrience acquise sur place lors de sCismes pas& et sur des coefficients de correction empiriques tenant compte des pressions de confinement ClevCes et du biais statique. C'est la pratique reconnue en AmCrique du Nord et on I'utilise B cause de la difficult& qu'on a B rCcupCrer et B soumettre aux essais des Cchantillons de sable non remaniCs. Avec les contraintes de confinement ClevCs qui prCvalent sur le site, l'approche indirecte a donne des valeurs trtts basses des propriCtCs fondamentales de IiquCfaction des sols et I'utilisation de vaieurs aussi faibles dans les calculs a montrC que des mesures majeures et coDteuses de rCparation Ctaient nkcessaires. On a donc suivi une approche plus directe. Pour cela on a fait appel B la dktermination B la fois directe et semi-indirecte des paramktres clCs du sol au cours d'une Ctt~de complttte de laboratoire b a k e sur des essais faits sur des Cchantillons obtenus par congklation en place. Les rksultats ont montrC que le seuil de rksistance des sols ainsi que la valeur rCsiduelle Ctaient beaucoup plus ClevCs que ceux qu'on avait obt...

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Geologic and seismic setting pertinent to dam safety review of Duncan Dam

Cited by 6 publications

References 10 publications

Interpretation of in situ test results from the CANLEX sites

Interpretation of in situ test results from the CANLEX sites

Numerical Analysis and Back Calculation of Embankment Dam Using Monitoring Results (Case Study: Iran-Lurestan Rudbar)

Results and implications of seismic performance studies for Duncan Dam

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