The Influence of NaCl Crystallization on the Long-Term Mechanical Behavior of Sandstone

doi:10.1007/s00603-013-0536-y

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	The Influence of NaCl Crystallization on the Long-Term Mechanical Behavior of Sandstone
	Feng, Xia-Ting; Zheng, Hong; Jiang, Quan
刊名	ROCK MECHANICS AND ROCK ENGINEERING
	2015
卷号	48 期号:1 页码:33-51
关键词	NaCl crystallization Sandstone Poro-viscoelasticity model Interfacial energy Long-term mechanical behavior
ISSN号	0723-2632
DOI	10.1007/s00603-013-0536-y
英文摘要	Salt precipitation can occur in saline aquifers when the pore-fluid concentration exceeds saturation during carbon dioxide sequestration, especially in the dry-out region closest to the wellbore. Results from uniaxial and triaxial compression tests, creep tests, and poromechanical tests indicate that NaCl crystallization in pores enhances the compressive strength and bulk modulus under the given confining pressure, and reduces creep. In addition, it makes the pore liquid pressure in the sandstone less sensitive to changes in the hydrostatic stress under undrained conditions. A poro-viscoelastic model with crystals in the pores is proposed to quantitatively estimate the influence of in-pore NaCl crystallization on the long-term mechanical behavior of sandstone. By considering the thermodynamics of crystallization, a geometrical model of a crystal in a pore space is applied to the quasi-static equilibrium state of the crystallization. The solid-liquid interfacial energy is introduced to provide a convenient approach to couple the mechanical properties of sandstone (as a porous material) and the thermochemistry of the in-pore NaCl crystallization. By adding the solid-liquid interfacial energy, the Clausius-Duhem inequality for the skeleton is established for the viscoelasticity based on the proposed geometrical model of a crystal in the pore space. The constitutive equations are deduced from the free energy balance relationship to evaluate the influence of crystallization on the effective stress in terms of the solid-liquid interfacial energies and the pore-size distribution. By comparing the model's output with the test results, it is found that the poro-viscoelastic model describes the influence of in-pore NaCl crystallization on the long-term mechanical behavior of the sandstone reasonably well.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	SPRINGER WIEN
WOS记录号	WOS:000347296400003
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/3666]
专题	岩土力学所知识全产出_期刊论文岩土力学所知识全产出国家重点实验室知识产出_期刊论文
作者单位	Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn
推荐引用方式 GB/T 7714	Feng, Xia-Ting,Zheng, Hong,Jiang, Quan. The Influence of NaCl Crystallization on the Long-Term Mechanical Behavior of Sandstone[J]. ROCK MECHANICS AND ROCK ENGINEERING,2015,48(1):33-51.
APA	Feng, Xia-Ting,Zheng, Hong,&Jiang, Quan.(2015).The Influence of NaCl Crystallization on the Long-Term Mechanical Behavior of Sandstone.ROCK MECHANICS AND ROCK ENGINEERING,48(1),33-51.
MLA	Feng, Xia-Ting,et al."The Influence of NaCl Crystallization on the Long-Term Mechanical Behavior of Sandstone".ROCK MECHANICS AND ROCK ENGINEERING 48.1(2015):33-51.