Numerical modelling on water retention and permeability of compacted GMZ bentonite under free-swelling conditions

doi:10.1002/nag.3078

	Numerical modelling on water retention and permeability of compacted GMZ bentonite under free-swelling conditions
	Ni Hongyang 1,2,3; Liu Jiangfeng 1,2,3; Guo Jingna 2,3; Yang Diansen 4; Chen Yonggui 1
刊名	INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS
	2020-05-09
页码	15
关键词	GMZ bentonite numerical modelling permeability water retention
ISSN号	0363-9061
DOI	10.1002/nag.3078
英文摘要	In this study, a solid-liquid-gas coupled equation was established to simulate water retention characteristics of highly compacted GMZ bentonite. Then, modelling results were compared with laboratory test results. Results indicate that GMZ bentonite has a strong moisture expansion (or a limit drying shrinkage) characteristic. The control equation can simulate the water absorption and deformation characteristics very well at high relative humidity (or low suction). Environmental scanning electron microscope (ESEM) observation reveals the course grain soil texture of the surface under low relative humidity (RH), while the surface of GMZ bentonite becomes smooth (more fine-grained soil texture) as RH increases. Differences were found between the porosities calculated by macroexperiment results and microscopic observations with ESEM method. This is because only the interaggregate pores can be observed by ESEM photographs. Additionally, we find that the simulated effective porosities are close to the results calculated by microscopic tests, while the effective porosity is considered as the main flow channel of flow. Further, the intrinsic permeability, the effective water and gas permeability are calculated based on the proposed model. The modelling results coincide well with the laboratory experimental results and support the reliability of the proposed model.
资助项目	Open Fund of Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education (Tongji University)[KLE-TJGE-B1703] ; Fundamental Research Funds for the Central Universities (China University of Mining and Technology)[2019ZDPY13] ; China Postdoctoral Science Foundation[2019M661993] ; National Natural Science Foundation of China[51809263]
WOS研究方向	Engineering ; Materials Science ; Mechanics
语种	英语
出版者	WILEY
WOS记录号	WOS:000531101200001
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/24124]
专题	中科院武汉岩土力学所
通讯作者	Liu Jiangfeng
作者单位	1.Tongji Univ, Key Lab Geotech & Underground Engn, Minist Educ, Shanghai 200092, Peoples R China 2.China Univ Min & Technol, State Key Lab Geomech & Deep Underground Engn, Xuzhou 221116, Jiangsu, Peoples R China 3.China Univ Min & Technol, Sch Mech & Civil Engn, Xuzhou 221116, Jiangsu, Peoples R China 4.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China
推荐引用方式 GB/T 7714	Ni Hongyang,Liu Jiangfeng,Guo Jingna,et al. Numerical modelling on water retention and permeability of compacted GMZ bentonite under free-swelling conditions[J]. INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS,2020:15.
APA	Ni Hongyang,Liu Jiangfeng,Guo Jingna,Yang Diansen,&Chen Yonggui.(2020).Numerical modelling on water retention and permeability of compacted GMZ bentonite under free-swelling conditions.INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS,15.
MLA	Ni Hongyang,et al."Numerical modelling on water retention and permeability of compacted GMZ bentonite under free-swelling conditions".INTERNATIONAL JOURNAL FOR NUMERICAL AND ANALYTICAL METHODS IN GEOMECHANICS (2020):15.