Comparison of Liquefaction-Induced Ground Deformation Between Results from Undrained Cyclic Torsional Shear Tests and Observations From Previous Model Tests and Case Studies

Kamiya, Takashi; Koseki, Junichi; Sato, Takeshi

doi:10.3208/sandf.50.421

Cited by 13 publications

(4 citation statements)

References 10 publications

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“…a 0.16-0.40Tatsuoka et al (1986),Kiyota et al (2008Kiyota et al ( , 2010,Zhang and Wang (2012),Chiaro et al (2012),De Silva et al (2015), andUmar et al (2016) a Initial isotropic effective stress.…”

mentioning

confidence: 99%

Development and Implementation of Semiempirical Framework for Modeling Postliquefaction Shear Deformation Accumulation in Sands

Τασιοπούλου¹,

Ziotopoulou

Humire

et al. 2020

J. Geotech. Geoenviron. Eng.

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A framework for the estimation of coseismic deformations in the postliquefaction regime is developed based on an extensive database of available cyclic undrained stress-controlled tests on clean sand samples without static shear bias, covering a wide range of relative densities. Based on fundamental experimental observations, a compliance rate is defined as the postliquefaction shear strain rate per cycle over the shear stress amplitude. Semiempirical relationships of the compliance rate as a function of relative density are developed to provide guidance for estimating postliquefaction shear strains. The proposed framework provides a basis for the calibration of advanced constitutive models capable of capturing postliquefaction strain accumulation. A calibration methodology is proposed using both existing liquefaction resistance curves and the newly developed semiempirical relationships for estimating postliquefaction shear strain accumulation. The validity of the proposed methodology is demonstrated by numerical simulations, using the PM4Sand model, of two well-documented centrifuge tests focusing on liquefaction-induced demands on engineering structures.

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mentioning

confidence: 99%

Development and Implementation of Semiempirical Framework for Modeling Postliquefaction Shear Deformation Accumulation in Sands

Τασιοπούλου¹,

Ziotopoulou

Humire

et al. 2020

J. Geotech. Geoenviron. Eng.

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show abstract

“…Therefore, the evaluation focuses on the trend in angle magnitude rather than the exact angle values. Test II's angle data, depicted on the left side of The torsional shear apparatus (Figure 18 left) featuring hollow cylindrical specimens is acknowledged as a valuable tool for accurately assessing the soil response to liquefaction [9]. Notably, it allows the replication of simple shear conditions, which closely resemble the stress state experienced in the field during earthquakes.…”

Section: Medium-scale 1-g Shaking Table Testsmentioning

confidence: 99%

State-of-the-Art Application of the Log-Piling Method in the Role of Shallow Ground Improvement for Liquefaction Mitigation

Milev,

Takashi,

Shoei

et al. 2024

AFST

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This research paper focuses on evaluating the log piling technique as a sustainable, cost-effective, and environmentally friendly solution for reducing soil liquefaction risks during earthquakes. Although this method has been used extensively in Japan, mainly aiming for complete soil layer penetration, its economic viability is questionable in cases requiring very deep soil improvements. The study highlights that shallow ground improvement can notably enhance the seismic behavior of the soil-improvement-structure system, as evidenced by the reduced total and penetration settlements caused by liquefaction. The paper presents a methodology for determining the optimal dimensions of the modified ground zone using both small and medium-scale 1-g shaking table tests.&nbsp; The small-scale tests involve a detailed parametric study, examining variables like improvement width, pile spacing, and the depth-to-thickness ratio of the improved layer. Medium-scale tests, on the other hand, are geared towards identifying the minimum effective pile length. This approach provides a practical guideline for engineers to implement log piling for small residential buildings. Additionally, the paper utilizes finite element method (FEM) effective stress analysis, incorporating a PLAXIS 2D-based constitutive model (PM4Sand) calibrated with laboratory undrained cyclic torsional tests. This model accounts for the changes in effective stress during seismic activities. Finally, the study correlates its numerical findings with the results from the 1-g shaking table experiments, offering a well-rounded perspective on the effectiveness of log piling in mitigating liquefaction risks during seismic events &nbsp;

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“…A torsional shear apparatus on hollow cylindrical specimens is recognized to be a good tool to properly evaluate liquefaction soil response [21,22]. In particular, it offers the possibility to reproduce simple shear conditions that are a close representation of field stress conditions during earthquakes [23][24][25][26].…”

Section: Test Apparatusmentioning

confidence: 99%

“…In the latter tests, a correction for the effects of membrane resistance on measured shear stress was carefully applied [21]. Kiyota et al [22] reported that the maximum amounts of liquefaction-induced ground displacement observed in relevant model tests and field observations are consistent with the limiting value to initiate strain localization observed in torsional shear tests [21]. Therefore, as long as the shear deformation remains uniform, the results of torsional shear tests can be effectively used to estimate the extent of large deformation that will occur in the field during earthquakes [22].…”

Section: Test Apparatusmentioning

confidence: 99%

Earthquake-Induced Flow-Type Slope Failure in Weathered Volcanic Deposits—A Case Study: The 16 April 2016 Takanodai Landslide, Japan

et al. 2022

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The aim of this paper is to provide new insight into the catastrophic mobility of the earthquake-induced flow-type Takanodai landslide that occurred on 16 April 2016, which had fatal consequences. A geological and geotechnical interpretation of the site conditions and experimental investigations of the mechanical behavior of weathered Kusasenrigahama (Kpfa) pumice are used to characterize the landslide failure mechanism. The results of large-strain undrained torsional shear tests indicate that Kpfa pumice has the potential to rapidly develop very large shear strains upon mobilization of its cyclic resistance. To evaluate the actual field performance, a series of new liquefaction triggering analyses are carried out. The liquefaction triggering analyses indicate that Kpfa pumice did not liquefy during the Mw6.2 foreshock event, and the hillslope remained stable. Instead, it liquefied during the Mw7.0 mainshock event, when the exceedance of the cyclic resistance of the Kpfa pumice deposit and subsequent flow-failure type of response can be considered the main cause of the landslide. Moreover, the combination of large cyclic stress ratios (CSR = 0.21–0.35)—significantly exceeding the cyclic resistance ratio CRR = 0.09–0.13)—and static shear stress ratios (α = 0.15–0.25) were critical factors responsible for the observed flow-type landslide that traveled more than 0.6 km over a gentle sloping surface (6°–10°).

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Comparison of Liquefaction-Induced Ground Deformation Between Results from Undrained Cyclic Torsional Shear Tests and Observations From Previous Model Tests and Case Studies

Cited by 13 publications

References 10 publications

Development and Implementation of Semiempirical Framework for Modeling Postliquefaction Shear Deformation Accumulation in Sands

Development and Implementation of Semiempirical Framework for Modeling Postliquefaction Shear Deformation Accumulation in Sands

State-of-the-Art Application of the Log-Piling Method in the Role of Shallow Ground Improvement for Liquefaction Mitigation

Earthquake-Induced Flow-Type Slope Failure in Weathered Volcanic Deposits—A Case Study: The 16 April 2016 Takanodai Landslide, Japan

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