Numerical and experimental investigation of pillar reinforcement with pressurized grouting and pre-stress

Hyung Joon Seo, Hangseok Choi, In Mo Lee

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

To prevent and/or minimize flood-induced damage in metropolitan cities like Seoul, South Korea, construction of an underground rainwater storage cavern becomes an alternative to other conventional countermeasures. In this paper, a new pillar-reinforcement method was developed to improve pillar stability that is crucial for the successful construction of the rainwater storage cavern. Three pillar-reinforcing scenarios were compared numerically: (1) shotcrete installation only, (2) shotcrete installation and pillar-reinforcement with radially pressurized grouting and pre-stress, and (3) shotcrete installation and pillar-reinforcement with vertical upward pressurized grouting and pre-stress. The third pillar-reinforcement readily made the stress condition return to an elastic state showing superior performance to the other methods. In addition, two pillar widths of 800 mm and 1200 mm were considered to investigate the effects of pillar width on pillar reinforcement by carrying out a small-scale model test, in which the three pillar-reinforcement scenarios can be modeled step-by-step. The pillar width of 1200 mm resulted in smaller major principal stresses, representing better reinforcing performance than that of 800 mm. Moreover, it was shown that the pressurized grouting enhances the ground strength and more importantly lessened stress concentration in the pillar. However, applying pre-stress further increased ground strength because of the increase in internal pressure.

Original languageEnglish
Pages (from-to)135-144
Number of pages10
JournalTunnelling and Underground Space Technology
Volume54
DOIs
Publication statusPublished - 2016 Apr 1

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Grouting
grouting
pillar
reinforcement
Reinforcement
shotcrete
cavern
rainwater
Stress concentration
model test

Keywords

  • Pillar
  • Pre-stress
  • Pressurized grouting
  • Underground rainwater detention cavern

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Building and Construction

Cite this

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abstract = "To prevent and/or minimize flood-induced damage in metropolitan cities like Seoul, South Korea, construction of an underground rainwater storage cavern becomes an alternative to other conventional countermeasures. In this paper, a new pillar-reinforcement method was developed to improve pillar stability that is crucial for the successful construction of the rainwater storage cavern. Three pillar-reinforcing scenarios were compared numerically: (1) shotcrete installation only, (2) shotcrete installation and pillar-reinforcement with radially pressurized grouting and pre-stress, and (3) shotcrete installation and pillar-reinforcement with vertical upward pressurized grouting and pre-stress. The third pillar-reinforcement readily made the stress condition return to an elastic state showing superior performance to the other methods. In addition, two pillar widths of 800 mm and 1200 mm were considered to investigate the effects of pillar width on pillar reinforcement by carrying out a small-scale model test, in which the three pillar-reinforcement scenarios can be modeled step-by-step. The pillar width of 1200 mm resulted in smaller major principal stresses, representing better reinforcing performance than that of 800 mm. Moreover, it was shown that the pressurized grouting enhances the ground strength and more importantly lessened stress concentration in the pillar. However, applying pre-stress further increased ground strength because of the increase in internal pressure.",
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AB - To prevent and/or minimize flood-induced damage in metropolitan cities like Seoul, South Korea, construction of an underground rainwater storage cavern becomes an alternative to other conventional countermeasures. In this paper, a new pillar-reinforcement method was developed to improve pillar stability that is crucial for the successful construction of the rainwater storage cavern. Three pillar-reinforcing scenarios were compared numerically: (1) shotcrete installation only, (2) shotcrete installation and pillar-reinforcement with radially pressurized grouting and pre-stress, and (3) shotcrete installation and pillar-reinforcement with vertical upward pressurized grouting and pre-stress. The third pillar-reinforcement readily made the stress condition return to an elastic state showing superior performance to the other methods. In addition, two pillar widths of 800 mm and 1200 mm were considered to investigate the effects of pillar width on pillar reinforcement by carrying out a small-scale model test, in which the three pillar-reinforcement scenarios can be modeled step-by-step. The pillar width of 1200 mm resulted in smaller major principal stresses, representing better reinforcing performance than that of 800 mm. Moreover, it was shown that the pressurized grouting enhances the ground strength and more importantly lessened stress concentration in the pillar. However, applying pre-stress further increased ground strength because of the increase in internal pressure.

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