渗流–应力–化学耦合作用下岩石裂隙渗透特性试验研究

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Abstract In order to research the hydro-mechano-chemical process in fractured rock，we designed three different kinds of experimental conditions，changing the osmotic pressure and the chemical solution for injection. During these three tests，we measured the seepage discharge，ion concentration and the pH value for observing the seepage properties in fractured rock. Through analyzing the test data and the summary about the characteristics of fractured rocks under different factors，a kind of relationship between the aperture variance ratio and the ion concentration of seepage was established. The test results indicate that：the seepage discharge and the fracture opening all decrease with time，and reach stable state eventually；the improvement of seepage pressure results in the increase of discharge through fractured rocks，correspondingly，the aperture enlarged which the permeability properties of those fractured rocks increased；carbonated with acidic coming through limestone can produce chemical reaction to accelerate the erosion and dissolution of the limestone，resulting in the increase of the aperture. Through analyzing the relationship among the seepage discharge，ion concentration and the pH value with time，we described the evolution of pressure dissolution，free-face solution，chemical dissolution，furthermore revealing the seepage properties of the rock fracture under coupled hydro-mechano-chemical process.

Key words： rock mechanics hydro-mechano-chemical compling rock fracture seepage properties coupled test

Received: 29 December 2011

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http://www.rockmech.org/EN/Y2012/V31/I5/1016

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