IMECH-IR  > 流固耦合系统力学重点实验室
A novel liquid bridge model for estimating SWCC and permeability of granular material
Wang XL(王晓亮); Li JC(李家春); Li, JC (reprint author), Chinese Acad Sci, Inst Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China.
Source PublicationPOWDER TECHNOLOGY
2015-05
Volume275Pages:121-130
ISSN0032-5910
AbstractAs traditional liquid bridge model based on Yang-Laplace theory fails to model behaviors of unsaturated granular materials when liquid bridges fuse with each other in funicular and capillary regimes, a method called "Redistribution of Air Volume and Reduction of Liquid Bridge Force" is proposed, and incorporated into the original discrete element method to resolve this issue. Both soil water characteristic curve and suction stress characteristic curve are worked out by the modified discrete element method, the results of which coincide with theoretical solutions for simple cubic packing and tetrahedral packing of granular materials. Furthermore, parameter study shows that soil water characteristic curve depends on effective particle diameter, particle size distribution and packing density. Typical soil water characteristic curves of sand and silt are obtained using the modified method, with a trend similar to that of experiment qualitatively. With the help of Mualem model and Kozeny-Carman equation, permeability is also predicated for granular materials. In particular, the air entry value coincides with or close to those of typical sand and silt in magnitude. Finally, a case study of SWCC prediction for sandy soil is implemented with acceptable results. We may conclude that the modified discrete element method is capable of predicting hydraulic properties of granular materials qualitatively and semi-quantitatively. (C) 2015 Published by Elsevier B.V.
KeywordUnsaturated Granular Materials Discrete Element Method Soil Water Characteristic Curves Liquid Bridge
Subject AreaEngineering, Chemical
DOI10.1016/j.powtec.2015.01.044
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Indexed BySCI ; EI
Language英语
WOS IDWOS:000351801300014
WOS KeywordPARTICLE-SIZE DISTRIBUTION ; DISCRETE ELEMENT METHOD ; UNSATURATED SOILS ; HYDRAULIC CONDUCTIVITY ; ROLLING RESISTANCE ; CHARACTERISTIC CURVE ; SUCTION STRESS ; SHEAR-STRENGTH ; DEM ANALYSES ; CAPILLARY
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
Funding OrganizationNational Natural Science Funds of China [11432015, 10932012]
DepartmentLMFS水环境流体力学(LEM)
Classification二类/Q2
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/49918
Collection流固耦合系统力学重点实验室
Corresponding AuthorLi, JC (reprint author), Chinese Acad Sci, Inst Mech, 15 Beisihuanxi Rd, Beijing 100190, Peoples R China.
Recommended Citation
GB/T 7714
Wang XL,Li JC,Li, JC . A novel liquid bridge model for estimating SWCC and permeability of granular material[J]. POWDER TECHNOLOGY,2015,275:121-130.
APA 王晓亮,李家春,&Li, JC .(2015).A novel liquid bridge model for estimating SWCC and permeability of granular material.POWDER TECHNOLOGY,275,121-130.
MLA 王晓亮,et al."A novel liquid bridge model for estimating SWCC and permeability of granular material".POWDER TECHNOLOGY 275(2015):121-130.
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