花岗岩水岩反应中水化学变化实验研究

Abstract

Abstract: Many earthquake cases show that the change of groundwater components can be observed before and after the earthquakes. We simulated the changes of hydrochemical components of granite aquifers during stress accumulation to fracture of rock by the experiment of granite and water under differential stress,and discussed formation mechanism of hydrochemical anomalies related to earthquakes. The experimental results show that the concentrations of different ions in water increase with stress and loading time in different degrees, of which the concentrations of Na⁺, K⁺ and Cl^- are the most obvious. With the increasing of differential stress,the concentration of the three ions increases to 3.3, 2.5 and 11.6 times respectively. With the increasing of stress loading time,the concentration of the three ions increases to 3.2, 3.1 and 12.5 times respectively. These changes are mainly related to the dissolution of minerals in granite. Na⁺, K⁺ and Cl^- could be used as the sensitive components for monitoring earthquake hydrochemical precursors in granite aquifers.

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

CLC Number:

P315.7

YANG Si-yu, YI Li, WANG Shuang-jie. Experiment of Hydrochemical Changes in Granite-water Reaction[J]. EARTHQUAKE, 2018, 38(3): 115-122.

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Experiment of Hydrochemical Changes in Granite-water Reaction

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