三轴压力下水与砂岩反应的实验研究

Abstract

Abstract: Hydrochemical variations associated with the creeping and shearing deformation of saturated sandstone under triaxial compression were experimentally investigated, and genetic mechanism of hydrochemical anomalies related to earthquake was discussed. Concentrations of F^-, Cl^-, NO^-₃, SO^2-₄, Ca²⁺, Mg²⁺ and Na⁺ in the produced solutions under different stresses were measured by IC and ICP-OES. With the time of creeping increasing and the differential stresses on the saturated sandstone, the concentrations of different ions in the produced solution increased to different extents,only the concentration of Mg²⁺ decreased. Concentrations of F^- and Cl^-, which varied most obviously, increased by 10 and 4 times with creeping from 2 to 12 hours,and 5 and 3 times with the shearing stress increases respectively. These phenomena are mainly caused by the dissolution of minerals and mixture of fluid inclusions. The experiment results indicate that F^-, Cl^- and Ca²⁺ can be considered as sensitive components for monitoring earthquake in sandstone aquifers.

Key words: Sandstone, Differential stress, Water-rock reaction, Ion concentration, Earthquake precursor

CLC Number:

P315.7

JIANG Yue, DU Jian-guo, YI Li, LUO Li, WANG Fu-kuan, CHEN Zhi. Experimental Study of Water-sandstone Reaction under Triaxial Stress[J]. EARTHQUAKE, 2009, 29(2): 73-80.

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Experimental Study of Water-sandstone Reaction under Triaxial Stress

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