Yunmin Chen’s research while affiliated with Zhejiang University and other places

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Publications (3)


Centrifuge Model Test on the Effect of Soil Fluidization on the Bending Moment of the Sheet-Pile Wall
  • Preprint

January 2024

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3 Reads

Yan-Guo Zhou

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Shuai Ning

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Yunmin Chen

Model configurations: a soil-cement grid improved ground in Case SC-L1 and Case SC-L2 and b unimproved ground in Case FF-L1
Target region of soil-cement grid improved ground
Grain size distribution curves of test materials
Fabrication procedures of soil-cement grid
Acceleration time histories in a Case FF-L1, b Case SC-L1 and c Case SC-L2

+9

Centrifuge model tests on liquefaction mitigation effect of soil-cement grids under large earthquake loadings
  • Article
  • Publisher preview available

May 2023

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139 Reads

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6 Citations

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Yuhei Kurimoto

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Yan-Guo Zhou

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[...]

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Yunmin Chen

In this study, the seismic response and liquefaction mitigation effect of the soil-cement grid improved ground subjected to large earthquake loadings are studied through dynamic centrifuge tests. The model tests included soil-cement grid improved and unimproved model grounds, both of which have a 15-m-thick liquefiable layer underlain by a 2.5-m-thick coarse sand layer. The pre-cast soil-cement grid adopted in this study enables the dynamic responses of the model closer to the real improved ground. The recorded responses of accelerations, excess pore pressures and the deformation of the enclosed soil in the improved ground were carefully analysed with the comparison of the ground without improvement. It shows that the soil liquefaction and post-shaking settlements were effectively mitigated by the soil-cement grid even under very strong shakings. And the restriction effect of the soil-cement grid on dynamic shear strain of the enclosed soil was the most prominent in the middle height, regardless of the intensities of the shaking events. Such mitigating “waist effect” could mainly be attributed to the dynamic soil-grid interaction during shaking. However, the underlain soil layer may experience larger shear strain due to the increasing inertial force of the overlying ground improved by the soil-cement grid.

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Influence of particle-size disparity on cyclic liquefaction resistance of silty sands

June 2020

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67 Reads

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16 Citations

Géotechnique Letters

Liquefaction of silty sands remains puzzling due to the complexity involved in the interaction between coarse and fine particles during loading. This paper presents first-hand experimental data from a series of cyclic triaxial tests under controlled particle characteristics, with the aim to elucidate the influence of particle-size disparity on the liquefaction resistance of sand−fines mixtures. A detailed analysis of the test results and an experimental database compiled from the literature reveal that the particle-size disparity, defined as the ratio between the characteristic sizes of the base sand and the fines, is a major and rational factor controlling the reduction of cyclic resistance of sand−fines mixtures as compared with factors such as the grading and shape of the base sand. A simple, explicit expression is further proposed to properly account for the reduction of cyclic resistance of sand due to fines.

Citations (2)


... Previous studies have assessed the impact of shear strain restraint methods, such as deep soil mixing (DSM) columns and grids, on consequences of soil liquefaction, focusing on performance in the absence of structure, both experimentally (e.g., Madabhushi 2011, 2013;Khosravi et al. 2016;Cao et al. 2023;Watanabe et al. 2023) and numerically (Namikawa et al. 2007;Xu et al. 2013;Bradley et al. 2013;Nguyen et al. 2013;Rayamajhi et al. 2014;Hasheminezhad and Bahadori 2019). ...

Reference:

Mitigation of Liquefaction Damage to Shallow-Founded Structures with In-Ground Structural Walls
Centrifuge model tests on liquefaction mitigation effect of soil-cement grids under large earthquake loadings

... Besides fines content, the influence of grading features of fines and coarse particles can also affect the cyclic resistance of silty sands. For example, in the case of sand-dominated silty sands (f c < f thre ), Wei et al. (2020) reported a comprehensive study based on a specifically designed experimental programme along with literature data analysis of different mixtures. It was found that a more reduction in CRR at the same f c is expected with increasing particle diameter ratio χ (i.e. the ratio D 10 / d 50 between the diameter of sand grains at which 10% of sample is finer and the mean particle diameter of fines). ...

Influence of particle-size disparity on cyclic liquefaction resistance of silty sands
  • Citing Article
  • June 2020

Géotechnique Letters