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Your search keyword '"Chen, Guo-Xing"' showing total 3 results
Start Over Author "Chen, Guo-Xing" Journal bulletin of earthquake engineering
3 results on '"Chen, Guo-Xing"'

2. Response of soil–pile–superstructure–quay wall system to lateral displacement under horizontal and vertical earthquake excitations.

Author

Xu, Ling-Yu, Chen, Wei-Yun, Cai, Fei, Song, Zhu, Pan, Jing-Min, and Chen, Guo-Xing

Subjects
GROUND motion, PORE water pressure, VERTICAL motion, SOIL liquefaction, SHEARING force, EARTHQUAKES
Abstract

The excess pore water pressure generated under the combined vertical and horizontal earthquake excitations is generally greater than that under the unidirectional excitation, which may further affect the dynamic response of soil-pile-superstructure-quay wall (SPSQ) system. This study conducted a coupled effective-stress analysis for the response of SPSQ system to liquefaction-induced lateral displacement under horizontal and vertical earthquake excitations. To accurately describe the lateral displacement behind the quay wall, the liquefaction behavior of soils was described by a modified generalized plasticity model with parameters properly determined from laboratory tests. The numerical model of the SPSQ system was validated against the previously reported centrifuge model tests. The results show that the earthquake excitation with abundant low-frequency component causes greater residual lateral displacements of pile cap (ux,RC) and quay wall (ux,RQ) than that with abundant high-frequency component. The ux,RC and ux,RQ tend to increase as the peak vertical acceleration increases for both vertical and inclined piles. Increasing the fixity of the quay wall significantly reduces the influence of vertical ground motion on the ux,RC and ux,RQ. The polarity reversal of the vertical ground motion also has a significant effect on the ux,RC and ux,RQ and should be considered in the analyses. In addition, the lateral displacement of liquefied ground causes an amount of rotation of the cap of the inclined pile, probably leading to the potential shear failure at the head of piles. Special consideration should be given to the earthquake-induced shear force at deeper location because the shear force could be significantly greater than that at the head of both inclined and vertical piles in certain cases. [ABSTRACT FROM AUTHOR]

Published
2023
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3. Experimental investigation on fluid characteristics of medium dense saturated fine sand in pre- and post-liquefaction

Author

Wang Binghui, Wang Zhi-hua, Li Xiaojun, Chen Guo-xing, and Zhou Enquan

Subjects
Dilatant, 021110 strategic, defence & security studies, 0211 other engineering and technologies, Liquefaction, 02 engineering and technology, Building and Construction, Apparent viscosity, Geotechnical Engineering and Engineering Geology, Pore water pressure, Geophysics, Compressibility, Shear stress, Relative density, Earthquake shaking table, Geotechnical engineering, Geology, 021101 geological & geomatics engineering, Civil and Structural Engineering
Abstract

Liquefaction of saturated loose sand is a major cause of extensive damage to buildings and infrastructures during large earthquakes. A better understanding of the behaviour of liquefied soil is becoming increasingly necessary to mitigate earthquake damage, and the fluid method has become an increasingly popular means to study the behaviour of liquefied soils. The purpose of this study is to determine the fluid characteristics of liquefied fine sand. In this paper, the apparent viscosity was measured as an index of fluid characteristics using the shaking table tests of pre-liquefaction behaviour of saturated fine sand at approximately 45 % relative density; the relationship of apparent viscosity and shear strain rate on liquefying fine sand was indicated as a power-law shear-thinning non-Newtonian fluid; and liquefying fine sand has the alternating behaviour of shear dilatancy and compressibility during cyclic loading. Additionally, a series of a monotonic axial compression loading tests in an undrained manner were performed to measure the shear stress and excess pore pressure ratio relationship on the post-liquefaction saturated fine sand at approximately 50 % relative density. The fluid characteristics of post-liquefaction fine sand exhibits rate dependence and can be described by a combined fluid model of time-independent and time-dependent power-law functions; the time-independent viscous resistance is not relevant to the excess pore pressure ratio; but the time-dependent frictional resistance is closely related to the excess pore pressure ratio. Furthermore, the results of the verification tests demonstrate that the proposed fluid model has good applicability for the fluid behaviour of the post-liquefaction fine sand.

Published
2016

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