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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 4    August 2001

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Mechanical and chemical behavior of
intergranular fluids in nonhydrostatically
stressed rocks at low temperature
LIU Liang-ming(刘亮明), PENG Sheng-lin(彭省临)

Department of Geology, Central South University,
Changsha 410083, P.R.China

Abstract:Intergranular fluids within the nonhydrostatically stressed solids are a sort of important fluids in the crust. Research on the mechanical and chemical behavior of the intergranular fluids in nonhydrostatically stressed rocks at low temperature is a key for understanding deformation and syntectonic geochemical processes in mid to shallow crust. Theoretically, it is suggested that the fluid film sandwiched between solid grains is one of the main states of intergranular fluids in the nonhydrostatically stressed solids. Their superthin thickness makes the fluid films have the mechanical and chemical behavior very different from the common fluids. Because of hydration force, double-layer repulsive force or osmotic pressure due to doublelayer, the fluid films can transmit nonhydrostatic stress. The solid mineralsintergranular fluids interaction and mass transfer by intergranular fluids is stress-related, because the stress in solid minerals can enhance the free energy of solid matter on the interfaces. The thermodynamic and kinetic equations for the simple case of stress induced processes are derived.

 

Key words: nonhydrostatically stress; intergranular fluids; free energy; fluidmineral reaction; mass transfer

ISSN 1672-7029
CN 43-1423/U

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