Loading-unloading behavior of a clayey rock under thermo-hydro-mechanical conditions

doi:10.1016/j.ijrmms.2021.104966

	Loading-unloading behavior of a clayey rock under thermo-hydro-mechanical conditions
	Yu, Hongdan 3; Chen, Weizhong 2,3; Gong, Zhe 1; Tan, Xianjun 3; Yang, Diansen 3
刊名	INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES
	2021-12-01
卷号	148 页码:9
关键词	Clayey rock Loading-unloading Hysteresis loops Temperature
ISSN号	1365-1609
DOI	10.1016/j.ijrmms.2021.104966
英文摘要	Various investigations have been carried out on the hydro-mechanical behavior of geomaterials, but those of clayey rock are still limited. Among these existing studies, very few data are available related to the thermal effects, particularly the loading-unloading behavior of clayey rock at high temperatures. In this paper, undrained loading-unloading triaxial tests on undisturbed specimens of Boom Clay extracted from Mol, Belgium, were carried out with the aim to study (1) the influence of temperature and load path on the thermo-hydro-mechanical behavior of clayey rock, and (2) the formation mechanism of loading-unloading stress-strain hysteresis loops. The test results first revealed the stress paths-dependent stress-strain behavior of Boom Clay. The increase of initial mean effective stress p ' 0 has a positive effect on the mechanical behavior of Boom Clay. Secondly, temperature elevation induced the strength weakening of Boom Clay even under loading-unloading conditions. Thirdly, the p ' 0 and temperature had a bearing on the loading-unloading elastic modulus (defined as the peak-topeak secant modulus of a hysteresis loop). Strain energy dissipation during the loading-unloading is then discussed from the perspective of thermodynamics. Finally, the study concludes that the stress-strain hysteresis loops for Boom Clay may be closely related to its high content of adsorbed water, and it may be driven by the combined effect of "friction resistance" and "viscous resistance."
资助项目	National Natural Science Foundation of China[51979266] ; National Natural Science Foundation of China[51879258] ; National Natural Science Foundation of China[51991392]
WOS研究方向	Engineering ; Mining & Mineral Processing
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000720977000005
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/28246]
专题	中科院武汉岩土力学所
通讯作者	Yu, Hongdan; Chen, Weizhong
作者单位	1.Wuhan Municipal Engn Design & Res Inst Co Ltd, Wuhan 430023, Hubei, Peoples R China 2.Shandong Univ, Res Ctr Geotech & Struct Engn, Jinan, Peoples R China 3.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Yu, Hongdan,Chen, Weizhong,Gong, Zhe,et al. Loading-unloading behavior of a clayey rock under thermo-hydro-mechanical conditions[J]. INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,2021,148:9.
APA	Yu, Hongdan,Chen, Weizhong,Gong, Zhe,Tan, Xianjun,&Yang, Diansen.(2021).Loading-unloading behavior of a clayey rock under thermo-hydro-mechanical conditions.INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES,148,9.
MLA	Yu, Hongdan,et al."Loading-unloading behavior of a clayey rock under thermo-hydro-mechanical conditions".INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 148(2021):9.