• Title/Summary/Keyword: Vibrohammer

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A study on the effect of ground vibration induced by vibrohammer and RCD on adjacent subway tunnel (바이브로 해머 및 RCD 공법 적용시 기존터널에 미치는 진동영향해석)

  • Huh, Young;Nam, Kee-Chun;Kim, Tae-Hyung;Bang, Jin-Ho;Kwak, Chang-Won
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.5 no.2
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    • pp.135-146
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    • 2003
  • This paper presents the effect of ground vibration induced by vibrohammer and RCD on adjancent subway tunnel performance using FDM program. Firstly, the stability criteria for structures near vibration source were proposed according to existing data, then peak particle velocity around tunnel was estimated based on detailed information of vibrohammer and existing formula for dynamic loads through numerical analysis. The peak particle velocity induced by RCD bit rotation was also estimated using surveyed data and formula. Consequently, displacement and stress responses were obtained at crown, shoulder and spring line and compared with the criteria to check stability of tunnel.

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Evaluation on the dynamic behavior of gravity quay wall with different relative density of rubble mound from 1-g shaking table tests (1-g 진동대 실험을 통한 사석마운드의 상대밀도에 따른 중력식 안벽의 동적거동 분석)

  • Lee, Yong-Jae;Han, Jin-Tae;Jang, In-Sung;Kim, Myoung-Mo
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2005.03a
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    • pp.82-89
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    • 2005
  • The vibrohammer compaction methods had been applied more and more to the rubble mound lying under the gravity quay wall in Korea. 1g Shaking table tests were performed to evaluate on the dynamic behavior of gravity quay wall with different relative density of rubble mound. The settlements, relative displacements and accelerations of gravity quay wall were measured and analysed.

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Evaluation of Analysis Technique for Piles Driven by Vibration through Parametric Study (매개변수연구를 통한 진동타입말뚝 해석기법 평가)

  • Lee, Seung-Hyun;Lee, Su-Hyung
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.3
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    • pp.1749-1755
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    • 2014
  • Technique for analyzing a pile installed by vibrohammer was developed and parametric studies were executed in order to evaluate reliability of the developed technique. Comparing the accelerations obtained from parametric studies of varying eccentric moment and frequency, it can be seen that magnitude of maximum acceleration was proportional to the eccentric moment and square of frequency. It can also be seen that amplitude of displacement was roughly proportional to the eccentric moment but has nothing to do with the frequency. It can be said that all of the analysis results reflect characteristics of behavior of a pile in case of free vibration. Comparing the dynamic load transfer curves, maximum dynamic unit toe resistance was constant regardless of the eccentric moment and the frequency and it can be seen that dynamic unit skin friction was affected by the eccentric moment not by frequency. Comparing all of the analysis results, it can be said that the developed technique is reliable.