Shaking table tests on mitigation of liquefaction vulnerability for existing embedded lifelines

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

doi:10.1016/j.sandf.2016.04.003

Cited by 23 publications

(2 citation statements)

References 18 publications

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“…In addition, Tobita et al (2011) studied the effect of the soil relative density and reported that the loose sand caused more uplift displacement in large underground structures. Adalier et al (2003), Orense et al (2003), Otsubo et al (2016a, b), and Paramasivam et al (2018) investigated the effect of excess porewater pressure (EPWP) dissipating from the vicinity of the structure. Accordingly, dewatering (Yegian et al 2007;Mitsuji 2008) can reduce the liquefaction effects.…”

Section: Introductionmentioning

confidence: 99%

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

2023

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The tunnels located in the shallow depths of loose saturated sand are significantly prone to liquefaction-induced uplift. Research works are, therefore, in progress to propose efficient techniques for mitigating uplift. In this study, 1 g physical modeling was used to assess the performance of helical piles for decreasing liquefaction-induced uplift. The effects of pile length, number of pile helixes, and the pile spacing in plan view were investigated. The uplift mechanism of the tunnel and helical pile system was also analyzed. The results demonstrate that the penetration of the helical piles into the dense layer underlying the superficial liquefiable sand has decreased tunnel uplift significantly. However, excessive close pile spacing along the tunnel resulted in shear surface interference, and the efficiency of the excessive number of helical piles decreased significantly. The detailed view of the uplift mechanism showed that utilization of the piles extended the transition phase of uplift during shaking. Helical piles can efficiently restrict the possibility of rapid uplift of the tunnel and shorten the duration of the primary uplift phase.

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Section: Introductionmentioning

confidence: 99%

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

2023

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“…Sitar and Al Atik (2010), Geraili-Mikola and Sitar (2013), and Brandenberg et al (2015) researched seismic lateral earth pressures on various underground structures complemented by analytical frameworks. Otsubo et al (2016) investigated effectiveness of different methods used for mitigating liquefaction-induced damage to pipelines through shake table tests. Cilingir et al (2011) studied the influence of embedment depth on the behavior of shallow tunnels using dynamic centrifuge modelling and complementary finite element analysis.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of Underground Structures in Sand: Experimental Data

et al. 2017

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A densely instrumented system of large-scale underground structures consisting of two vertical shafts connected through a cut-and-cover tunnel and two independent shield tunnels was installed in an 8 m-diameter laminar soil box at the E-Defense shake table in Miki, Japan. The system was subjected to step-sine sweeps and scaled ground motion records of the Kobe (1995) earthquake. The underground structures were embedded in Albany Silica Sand with an average relative density of 54%. System instrumentation consisted of over 800 sensors, including strain gauges, accelerometers, displacement transducers, bender elements and pressure sensors. A U.S.-Japanese research collaboration was established to instrument the vertical shaft elements and record seismic soil pressures. Data records are archived at the NHERI DesignSafe Data Depot_and can be used to analyze the structural response, soil-structure interaction and other response parameters of individual subsurface components as well as the entire system. The DOI for the data set is 10.17603/DS21C78.

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Liquefaction Mitigation Measures: A Historical Review

Towhata

2021

Latest Developments in Geotechnical Earthquake Engineering and Soil Dynamics

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Shaking table tests on mitigation of liquefaction vulnerability for existing embedded lifelines

Cited by 23 publications

References 18 publications

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

Shaking Table Test on Mitigation of Liquefaction-Induced Tunnel Uplift by Helical Pile

Dynamic Response of Underground Structures in Sand: Experimental Data

Liquefaction Mitigation Measures: A Historical Review

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