H.Y. Ming

Beibu Gulf University

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Centrifuge Modeling and the Influence of Fabric Anisotropy on Seismic Response of Foundations

Journal of Geotechnical and Geoenvironmental Engineering (2015)

Jie Qin X. Zeng H.Y. Ming

Failure of foundations induced by earthquakes occurred many times in the past. There is a general lack of data recorded during earthquakes in the field about seismic response of such foundations. According to the results of some previous laboratory tests and numerical analyses, anisotropy of fabric of soil grains has significant influence on dynamic soil response. However, there is hardly any realistic physical data available to analyze the influence of fabric anisotropy on the response of foundations during earthquakes. Centrifuge tests are small scaled model tests which have been widely used to study the mechanism of response and to verify and validate design methods and numerical simulations. In this study, 12 centrifuge tests were carried out to study the effect of fabric anisotropy on seismic response of foundations. Important parameters in the response are evaluated and implications for design are discussed.

Centrifuge

Physical modelling

Seismic loading

10.1061/(asce)gt.1943-5606.0001414

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Citations (16)

Effect of shaking strength on the seismic response of liquefiable level ground

Engineering Geology (2013)

Dong Su H.Y. Ming X.S. Li

Centrifuge

Earthquake shaking table

Settlement (finance)

10.1016/j.enggeo.2013.09.013

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Citations (27)

Theoretical magnetotelluric response of stratiform earth consisting of alternative homogeneous and transitional layers

Open Geosciences (2024)

Hongzhi Miao H.Y. Ming Xuelu Xiao Bolan Dai Xiaowei Yang

Abstract The magnetotelluric (MT) responses are explicitly solved for a stratiform earth containing multiple transitional layers in which the conductivity varies linearly with depth. In the model under consideration, any one homogeneous layer with constant conductivity or transitional one may be absent in the geometry. The traditional one-dimensional (1D) models with sharp boundaries will be obtained if all the transitional layers are absent in the geometry, while a special 1D model consisting of a sequence of contiguous transitional layers may be obtained if all the homogeneous layers (except the basement layer) are removed from the geometry. The tangential electric and magnetic fields as well as the surface impedance are analytically expressed by Airy functions. The analytical formula is validated in three theoretical examples by comparing with the results from available codes. The apparent resistivity and impedance phase on the surface of three different transitional models are illustrated to analysis the influence of the transitional layers on MT responses. The new formula provides an alternative way to obtain the analytic MT responses for the special layered earth.

Magnetotellurics

Earth model

10.1515/geo-2022-0563

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Citations (0)

Effect of Fabric Anisotropy on Liquefaction of Sand

Journal of Geotechnical and Geoenvironmental Engineering (2012)

Hao Yu Xiangwu Zeng B. Li H.Y. Ming

Liquefaction of sand is the main cause of failure for earth structures during earthquakes. Some past research showed that the fabric anisotropy of soils in the ground can cause different responses to both static and dynamic loading. The inherent fabric anisotropy of sand due to the deposition history and pattern may also affect the liquefaction potential of the ground. In this study, a group of earthquake centrifuge tests was performed on models of a level ground to investigate its seismic response with the soil deposited by different angles. A special rigid container was designed and used to prepare the models. It was found that the fabric anisotropy greatly influenced the response of the ground in displacement, acceleration, and excess pore pressure. The models with larger deposition angles had higher liquefaction potential. The results show that liquefaction evaluation of a sand layer should take into account the influence of fabric anisotropy caused by its deposition history and pattern.

Centrifuge

Soil liquefaction

Deposition

10.1061/(asce)gt.1943-5606.0000807

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Citations (33)

Fully Coupled Analysis of Failure and Remediation of Lower San Fernando Dam

Journal of Geotechnical and Geoenvironmental Engineering (2003)

H.Y. Ming X. S. Li

The extent of flow deformation in an embankment dam is determined by the driving forces and the residual strength of the soil, as well as by the kinematic constraints. The soil conditions of berm and buttress, as well as of foundation, are also critical factors affecting seismic performance of an embankment dam. A careful examination of these factors is necessary when proposing remedial measures to a seismically deficient dam. This paper presents a set of fully coupled finite element analyses of the response of the well-known lower San Fernando Dam during the 1971 earthquake. A critical state model incorporating the concept of state-dependent dilatancy was employed to describe soil behavior over the full range of loading conditions encountered. The results show clearly that a flow slide occurred on the upstream side, and indicate that a downstream flow slide would occur, too, if the downstream berm had not been constructed before the event. The analyses show also that the addition of an upstream berm could effectively prevent the upstream flow slide.

Berm

Foundation (evidence)

Buttress

Embankment dam

Underpinning

10.1061/(asce)1090-0241(2003)129:4(336)

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Citations (41)

Effects of soil density and earthquake intensity on flow deformation of the upper San Fernando dam

Géotechnique (2011)

H.Y. Ming Xingfei Li Tianliang Zheng

The seismic performance of the upper San Fernando dam is systematically studied by using a fully coupled finite-element procedure in conjunction with a unified state-dependent dilatancy sand model. With detailed information produced by this procedure, the effects of soil density and earthquake intensity on flow deformation of the embankment are examined. This paper provides convincing numerical evidence to prove that even though stronger earthquakes always produce larger deformation in the Upper San Fernando dam, an earthquake serves mainly as a trigger to initiate flow liquefaction. Once flow liquefaction is triggered by a sufficiently strong earthquake, the earthquake-induced flow deformation is controlled dominantly by the difference between the shear stress required for equilibrium and the shear strength of the liquefied soil, which is determined by its density under undrained earthquake loading conditions. The influence of the intensity of the earthquake itself on flow deformation of the embankment becomes secondary.

Dilatant

Soil liquefaction

Intensity

Effective stress

10.1680/geot.9.p.004.3682

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Citations (3)

Unified modeling of flow liquefaction and cyclic mobility

Soil Dynamics and Earthquake Engineering (2000)

X.S. Li H.Y. Ming

Dilatant

10.1016/s0267-7261(00)00022-1

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Citations (15)

Numerical Study of Impact of Soil Anisotropy on Seismic Performance of Retaining Structure

International Journal of Geomechanics (2007)

H.Y. Ming X. S. Li Yannis F. Dafalias

Recent laboratory investigations indicate that the stress–strain–strength responses of granular soils are appreciably affected by the fabric orientation of the soil relative to the frame of principal stresses. Especially, a sand specimen exhibiting a dilative response during triaxial compression may show a contractive response during triaxial extension under otherwise identical conditions. This observation is of practical importance for applications concerning essentially undrained loading conditions, because the effective mean normal stress at failure, and consequently, the shear strength, associated with an undrained contractive path are considerably lower than those following a dilative path. This raises a question about the impact of soil anisotropy on seismic performance of retaining structures subjected to active and passive earth pressures, because the directions of principal stresses in retained soils for the two cases are very different. This note presents a set of fully coupled finite-element analyses incorporating an anisotropic sand model. The analyses reveal that the impact of fabric anisotropy could be significant when the retaining structure is under passive earth pressure conditions.

Stress path

Principal stress

Foundation (evidence)

Triaxial shear test

Shear Strength

Lateral earth pressure

10.1061/(asce)1532-3641(2007)7:5(382)

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Citations (5)

Numerical Investigation of Seepage Effects on De-formation of Earth Dam

Soil Dynamics and Earthquake Engineering (2005)

H.Y. Ming X.S. Li

Source

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Citations (0)