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Effect of pressurized grouting on pullout resistance and group efficiency of compression ground anchor

Publication: Canadian Geotechnical Journal
23 July 2012

Abstract

The purpose of this study is to investigate the effect of pressurized grouting on pullout resistance and the group effect of the compression ground anchor by performing pilot-scale laboratory chamber tests and field tests. The laboratory test results show that the enlargement of the anchor body diameter estimated theoretically by combining the cavity expansion theory and grout penetration characteristics matches reasonably well with that obtained from experiments. The required injection time as a function of the coefficient of permeability of the ground is proposed. The results of a series of field anchor pullout tests show that the effect of pressurized grouting is more prominent in a softer ground with a smaller SPT-N value for an increase in both anchor body diameter and pullout resistance. The pressurized grouting effect in comparison with gravitational grouting was found to be almost zero if the SPT-N value is more than 50. Based on experimental results, a new equation to estimate the pullout resistance as a function of the SPT-N60 value is proposed. In addition, based on in situ group anchor pullout test results, a new group effect equation is proposed.

Résumé

L’objectif de cette étude est d’évaluer l’effet du coulis pressurisé sur la résistance au retrait ainsi que l’effet de groupe d’ancrages en compression dans le sol par la réalisation d’essais en laboratoire en chambre à l’échelle pilote et d’essais sur le terrain. Les résultats des essais en laboratoire ont démontré que l’agrandissement du diamètre du corps de l’ancrage estimé théoriquement en combinant la théorie de l’expansion des cavités et les caractéristiques de pénétration du coulis correspond de façon raisonnable avec celui obtenu à partir d’essais. Le temps d’injection nécessaire, en fonction de la perméabilité du sol, a été proposé. Les résultats d’une série d’essais de retrait d’ancrages de terrain ont démontré que l’effet du coulis pressurisé est plus évident dans un sol plus mou avec une valeur de SPT-N plus faible, autant pour l’augmentation du diamètre du corps de l’ancrage que pour la résistance au retrait. L’effet du coulis pressurisé, comparativement au coulis gravitaire, a été déterminé comme presque nul si la valeur de SPT-N est supérieure à 50. À partir des résultats expérimentaux, une nouvelle équation servant à estimer la résistance au retrait en fonction de la valeur de SPT-N60 est proposée. De plus, une nouvelle équation sur l’effet de groupe est proposée, basée sur les résultats d’essais de retrait in situ effectués sur un groupe d’ancrages.

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Information & Authors

Information

Published In

cover image Canadian Geotechnical Journal
Canadian Geotechnical Journal
Volume 49Number 8August 2012
Pages: 939 - 953

History

Received: 8 December 2010
Accepted: 28 January 2012
Version of record online: 23 July 2012

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Key Words

  1. compression ground anchor
  2. pressurized grouting
  3. pullout resistance
  4. grout consolidation model
  5. group effect

Mots-clés

  1. ancrages de compression dans le sol
  2. coulis pressurisé
  3. résistance au retrait
  4. modèle de consolidation du coulis
  5. effet de groupe

Authors

Affiliations

Seok-Won Lee [email protected]
Department of Civil and Environmental System Engineering, Konkuk University, Seoul, Korea.
Tea-Seob Kim
Shinwha Soil Tech. Co., Ltd., Seoul, Korea.
Bo-Kyoung Sim
Hyundai Engineering & Construction Co., Ltd., Seoul, Korea.
Jong-Sun Kim
Lotte Engineering & Construction Co., Ltd., Seoul, Korea.
In-Mo Lee
School of Civil, Environmental and Architectural Engineering, Korea University, 1 Anam-dong, Seongbuk-gu, Seoul 136-701, Korea.

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