Shaking Model Tests on Liquefaction Mitigation of Embedded Lifeline

Towhata, Ikuo; Otsubo, Masahisa; Uchimura, Taro; Shimura, Masato; Liu, Bangan; Hayashida, Toshihiko; Taeseri, Damoun; Cauvin, Bertrand

doi:10.1007/978-3-319-10786-8_12

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…A series of experiments were conducted by the authors to investigate the effectiveness of the proposed mitigation measures (Towhata et al, 2013). The tested cases for the drain pipe and the chemical grouting methods were tabulated in Table 1.…”

Section: Summary Of Experimental Results In Literaturementioning

confidence: 99%

“…Satisfactory resistance from the pavement can prevent floatation of the pipe. To evaluate the resistant force, a simplified factor of safety was proposed by the authors (Towhata et al, 2013). This paper assumes that the safety factor for a punching shear failure is sufficiently high.…”

Section: Horn Structure Methodsmentioning

confidence: 99%

“…The authors previously proposed new measures to mitigate liquefaction-induced damage in existing lifelines (Towhata et al, 2013): the vertical drain pipe method, connection with pavement by a stiff bar (namely, horn structure method) and the chemical grouting method (Fig. 1).…”

Section: Examined Mitigation Measuresmentioning

confidence: 99%

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Practical application of mitigation measures for existing underground lifelines subjected to liquefaction

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The 2011 Tohoku Earthquake at the Pacific coast of Japan caused significant liquefaction-induced damage around Tokyo Bay where floated pipelines and manholes were widely observed. To protect existing underground lifelines from future earthquakes in some other regions, mitigation measures are urgently required. The conventional measures require considerable time and economic resources, which hinders the feasibility of these methods. In this regard, the authors previously proposed new mitigation measures: the vertical drain pipe method, connection with pavement by stiff bars (namely, horn structure method) and the chemical grouting method. The proposed measures can be executed with a partial excavation of backfill soil, resulting in less construction period and cost. Satisfactory performances of the proposed measures were demonstrated through 1-g shaking model tests by the authors. The present study aims to develop a framework for practical application with the proposed measures. To evaluate the performance of the proposed measures, challenges of developing a simple analytical method based on simple beam models were discussed. The proposed analytical models qualitatively captured the experimental results.

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Section: Summary Of Experimental Results In Literaturementioning

confidence: 99%

Section: Horn Structure Methodsmentioning

confidence: 99%