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RISS 인기검색어
- 검색키워드
- 저자 : Xianzhang Ling (검색결과 3 건)
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Liang Tang,Xiaoyu Zhang,Xianzhang Ling 대한토목학회 2016 KSCE JOURNAL OF CIVIL ENGINEERING Vol.20 No.2
Installation oF Stone Column (SC) is a promising ground improvement technique to mitigate liquefaction hazards in sand stratum. In this study, a three-dimensional (3D) Finite Element (FE) analysis was used to simulate a centrifuge experiment on the mitigation of silty sand strata liquefaction using SC approach. The predicted response of the silty sand and SC matched the experimental data well. The overall site-stiffening effects due to the installed SCs as well as the distributions of the shear stress and shear stress reductions were evaluated. A parametric study was conducted to investigate the effect of the SC permeability and the surface load at the SC zone on the effectiveness of liquefaction mitigation. The results showed that the SCs behaved in a combined shear and flexure mode. Furthermore, the SCs with permeability exceeding a threshold value can dramatically decrease the liquefaction hazard. On the other hand, larger surface load did not prevent soil liquefaction and produced negligible benefits in stiffening. The present study further enhances the current understanding of the effectiveness of SC remediation approaches in the silty sand.
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Shengyi Cong,Liang Tang,Xianzhang Ling,Lin Geng,Jinchi Lu 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.4
Numerical approaches are providing a versatile environment for conducting the studies of slopes and shallow foundations on thetop of slopes. However, there are few studies for assessing the boundary effects on the seismic response of a soil slope and thedynamic behaviors of a shallow foundation on top of three-dimensional (3D) slopes. On the basis of a systematic parametric study,Finite Element (FE) simulations are firstly conducted to evaluate the boundary effect on the seismic performance of the soil slope. Then, the boundary effects on the behaviors of a shallow foundation on top of a 3D slope under the earthquake loadings areaddressed. The results show that for a given 3D soil slope, fixing the displacement degrees of freedom only in the y-direction(perpendicular to the shaking direction) at the lateral boundaries is inappropriate, because this approach does not consider the 3Deffect. A smaller slope’s width/height ratio is obtained for stiffer soil, compared to soft soil, as the 3D effects induced by the lateralboundaries lose significance. The earthquake characteristics (peak ground accelerations and frequency content) play important rolesin the differences among the three lateral boundaries. Furthermore, when the boundary extent along the y-direction is increased, thefoundation settlement that is controlled by the applied pressure and earthquake loading together, will be mostly affected by theseismic excitation. Overall, the conducted study highlights the significance of boundary conditions on the seismic responses of soilslopes and a shallow foundation on the top of it and can be helpful for engineers to choose an appropriate boundary in numericalanalysis.
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Yuan Yu,Liang Tang,Xianzhang Ling,Degou Cai,Yangsheng Ye,Lin Geng 대한토목학회 2020 KSCE Journal of Civil Engineering Vol.24 No.4
The concrete roadbed in the Beijing-Shenyang high-speed railway (HSR) is being serviced for the first time in HSR construction history. Rail inspections have shown that the extreme temperature conditions in seasonally freezing regions can significantly influence the curling behavior of concrete roadbeds. This paper presents an in situ experiment to fundamentally evaluate the impact of seasonal temperature variations on the curling behavior of concrete roadbeds. Herein, a thermomechanical coupled finite element (FE) model is built and calibrated with experimental data. Then, specific consideration is given to the curling mitigationmeasures, including adjusting the thickness, length, and construction form of the concrete roadbed. Mitigating upward-curling behavior by increasing the thickness of the concrete roadbed will result in severe downward-curling behavior during one year of service. Finally, an active groove-setting construction form is suggested to prevent curling from the temperature variations in the concrete roadbed. In general, this study further enhances the common understanding of the temperature curling behavior of concrete roadbeds serviced in an HSR.
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