The shear behavior of sandstone joints under different fluid and temperature conditions

doi:10.1016/j.enggeo.2019.05.020

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	The shear behavior of sandstone joints under different fluid and temperature conditions
	Zhang, Qiang ; Li, Xiaochun; Bai, Bing ; Hu, Haixiang
	2019
发表期刊	ENGINEERING GEOLOGY
ISSN	0013-7952
卷号	257 期号:-页码:-
摘要	Understanding the shear behavior of a sandstone joint under the influence of different fluids and temperature conditions is essential for evaluating the risks of wastewater injection and CO2 geological storage. To reveal the shear behavior, a series of direct shear tests were conducted on the sandstone joints with a similar joint roughness coefficient at temperatures range from 30 to 120 degrees C and under dry, H2O-injected, or CO2-injected conditions. Experimental results indicated that the temperature range from 30 to 120 degrees C does not significantly affect the shear strength and the friction coefficient of the sandstone joint, but it markedly decreases the shear stiffness and increases the peak shear displacement. With the increase in temperature, the shear strength is reduced by a maximum of 7.96% under dry conditions (at 90 degrees C), 3.17% under H2O-injected conditions (at 90 degrees C), and 2.41% under CO2-injected conditions (at 90 degrees C); the shear stiffness is reduced by a maximum of 65.8% under dry conditions (at 120 degrees C), 56.22% under CO2-injected conditions (at 120 degrees C), and 23.07% under H2O-injected conditions (at 120 degrees C). The mean friction coefficients under dry, H2O-injected, and CO2-injected conditions are 0.729, 0.696, and 0.714, respectively. The pore pressure could reduce the shear strength, and this effect follows Terzaghi's effective stress law for a sandstone joint. In addition, water and CO2 have a weakening effect on the friction coefficient. In the short term, water and CO2 lead to a reduction in the friction coefficient of approximately 4.53% and 2.06%, respectively. These results provide a basic insight into projects regarding the injection of wastewater and CO2 geological storage. However, the long-term effects of fluids on shear behavior need to be investigated in the future.
关键词	CO2 geological storage Induced earthquake Friction coefficient Supercritical CO2 Water Pore pressure
DOI	10.1016/j.enggeo.2019.05.020
收录类别	SCI
语种	英语
WOS研究方向	Engineering ; Geology
WOS类目	Engineering, Geological ; Geosciences, Multidisciplinary
WOS记录号	WOS:000473121100002
引用统计	被引频次：22[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://119.78.100.198/handle/2S6PX9GI/14941
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Hubei, Peoples R China; 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Qiang,Li, Xiaochun,Bai, Bing,et al. The shear behavior of sandstone joints under different fluid and temperature conditions[J]. ENGINEERING GEOLOGY,2019,257(-):-.
APA	Zhang, Qiang,Li, Xiaochun,Bai, Bing,&Hu, Haixiang.(2019).The shear behavior of sandstone joints under different fluid and temperature conditions.ENGINEERING GEOLOGY,257(-),-.
MLA	Zhang, Qiang,et al."The shear behavior of sandstone joints under different fluid and temperature conditions".ENGINEERING GEOLOGY 257.-(2019):-.

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