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Significance of the van der Waals force on the formation of the microstructure of wind-blown loess: An investigation using modified Discontinuous Deformation Analysis
Li, Qiang1,2; Li, Tonglu1,2; Shen, Wei1,2; Li, Hua3; Li, Ping1,2; Li, Yan1,2; Hou, Xiaokun4
2022-08-01
Source PublicationCOMPUTERS AND GEOTECHNICS
ISSN0266-352X
Volume148Pages:13
AbstractThe van der Waals force is significant for the formation of microstructures of wind-blown deposits, such as loess soil. However, it is difficult to observe the effect of the van der Waals force in the natural environment and laboratory. The conventional DDA model, which simplifies contact as compressed elastic springs, has been successfully applied in simulating blocky rock behaviors, but it is incapable of simulating tension forces. In this paper, we modified the conventional DDA model by considering blocks as soil particles and by applying the van der Waals force among the particles to investigate the micro-behavior of fine soil. The modified DDA is validated by simulating two ideal experiments. Then, the falling process of fine grains (<65 mu m), similar to wind-blown dust, is simulated by the modified and conventional DDA models separately. The simulated deposits of the falling grains by the two models show significant differences in microstructure. The microstructure generated by the modified DDA model is much closer to the loose structure of a real loess specimens, while that generated by the conventional DDA model is much more compact. This verifies that the van der Waals force is crucial for the formation of the loose microstructure of loess.
KeywordSoil microstructure Loess Interparticle force van der Waals force Discontinuous Deformation Analysis
DOI10.1016/j.compgeo.2022.104833
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC)
WOS KeywordAGGREGATE STABILITY ; MODEL ; SIMULATION ; DDA ; EVOLUTION ; COLLAPSE ; PACKING ; SURFACE
Language英语
Funding ProjectNational Natural Science Foundation of China[41790442] ; National Natural Science Foundation of China[41772278] ; China Scholarship Council (CSC)[202106560023]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC) ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; China Scholarship Council (CSC) ; China Scholarship Council (CSC)
WOS Research AreaComputer Science ; Engineering ; Geology
WOS SubjectComputer Science, Interdisciplinary Applications ; Engineering, Geological ; Geosciences, Multidisciplinary
WOS IDWOS:000809236500004
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/106093
Collection页岩气与地质工程院重点实验室
Corresponding AuthorShen, Wei
Affiliation1.Changan Univ, Sch Geol Engn & Geomatics, Xi'an 710054, Shaanxi, Peoples R China
2.Minist Educ, Water Cycle & Geol Environm Observat & Res Stn Chi, Zhengning 745399, Gansu, Peoples R China
3.Engn Univ Peoples Armed Police, Sch Equipment Management & Supportabil, Xi'an 710086, Shaanxi, Peoples R China
4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Shale Gas & Geoengn, Beijing 100029, Peoples R China
Recommended Citation
GB/T 7714
Li, Qiang,Li, Tonglu,Shen, Wei,et al. Significance of the van der Waals force on the formation of the microstructure of wind-blown loess: An investigation using modified Discontinuous Deformation Analysis[J]. COMPUTERS AND GEOTECHNICS,2022,148:13.
APA Li, Qiang.,Li, Tonglu.,Shen, Wei.,Li, Hua.,Li, Ping.,...&Hou, Xiaokun.(2022).Significance of the van der Waals force on the formation of the microstructure of wind-blown loess: An investigation using modified Discontinuous Deformation Analysis.COMPUTERS AND GEOTECHNICS,148,13.
MLA Li, Qiang,et al."Significance of the van der Waals force on the formation of the microstructure of wind-blown loess: An investigation using modified Discontinuous Deformation Analysis".COMPUTERS AND GEOTECHNICS 148(2022):13.
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