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JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE)
Civil and Hydraulic Engineering     
Study on liquefaction simulation of coupled particle-fluid assembly subject to bi-directional cyclic loading
JIN Wei feng,ZHANG Li you,CHEN Xiao liang,CHENG Ze hai
1.School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou310023, China;
2.College of Civil Engineering and Architecture,Zhejiang University,Hongzhal 310058,China;
3.Research Center of Coastal and Urban Geotechnical Engineering,Zhejiang University, Hangzhou 310023, China;
4.Hangzhou Municipal Construction Group CO.,LTD,Hangzhou 310023, China
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Abstract  

For particle-based simulation of liquefaction, it was difficult to apply cell pressure to the particle assembly during dynamic tri-axial test, which resulted in the unaccomplishment of liquefaction simulation under bi-directional loads.  Appropriate dynamic fluid equations and effective cell-pressure servo-control method were introduced in order to apply dynamic cell pressure. As for fluid equations,  they were based on arbitrary Lagrangian-Eulerian description and involved coupled fluid-particle terms. As for servo-control method of cell-pressure,  the optimal feedback control function of controlling cell-pressure was obtained from the Hamilton-Jacobian-Bellman (HJB) Equation established from the spring-mass model by simulating the particle assembly and the servo wall as a spring-mass model. Then coupled fluid-particle based simulation of liquefaction under bi-directional loads during dynamic tri-axial test was realized by adding finite element fluid equations and the servo-control method to the discrete element method software particle flow code 2D (PFC2D), The method  can well apply dynamic cell pressure and accomplish coupled particle-fluid based simulation of liquefaction under bi-directional loads.



Published: 01 November 2016
CLC:  TU 435  
Cite this article:

JIN Wei feng,ZHANG Li you,CHEN Xiao liang,CHENG Ze hai. Study on liquefaction simulation of coupled particle-fluid assembly subject to bi-directional cyclic loading. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2016, 50(11): 2135-2142.

URL:

http://www.zjujournals.com/eng/10.3785/j.issn.1008-973X.2016.11.014     OR     http://www.zjujournals.com/eng/Y2016/V50/I11/2135


双向激振液化的离散颗粒-流体耦合模拟方法

针对离散元模拟动三轴液化时难以施加围压,导致无法实现双向激振液化模拟的问题,提出引入适用的流体方程和有效的伺服围压算法实现动围压加载.针对流体方程,采用包含适用于流体边界网格移动的任意拉格朗日-欧拉描述(ALE)项和流体-颗粒耦合力项的流体方程组|针对伺服围压算法,将离散颗粒-流体伺服体系等效为弹簧-振子模型,采用的围压伺服力函数基于自动控制理论中的HJB方程得到.将流体有限元方程和伺服围压算法嵌入颗粒流软件(PFC2D),通过模拟双向动三轴液化实验,结果表明,该方法可以有效施加动围压,实现双向激振液化的离散颗粒-流体耦合模拟.

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