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| STUDY OF TIME SCALE AND STRENGTH MODEL OF YICHANG SANDSTONE UNDER DIFFERENT PH VALUES OF ACIDIC SOLUTION IMMERSION |
| (1. Key Laboratory of Geological Hazards on Three Gorges Reservoir Area，Ministry of Education，China Three Gorges University，Yichang，Hubei 443002，China；2. HydroChina Guiyang Engineering Corporation，Guiyang，Guizhou 550002，China) |
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Abstract Time scale and strength model of calcareous medium-fine sandstone of Yichang in acid environment of different pH values are studied combining several technological means，such as rock sample test，pH value variation accurate measurement and corrosion depth measurement of rock sample in immersion and so on. The concept of time scale is proposed using the amount of substance of hydrogen ion as datum quantity. Through the transformation of time scale，the long time reaction of weak acid can be simulated by the short time reaction of strong acid. Then two examples with stable acid ion supply and unstable acid ion supply are developed to verify the feasibility of this method. The porosity characteristic and multilayer phenomenon of sandstone after reaction are proposed and explained；and the relationship between corrosion depth of samples and time is established. It is also proposed that the decreasing rate of hydrogen ion concentration gets slowly with time and the increase in corrosion depth，which provides a foundation for the development of strength model. Based on the sketch of corrosion depth model of rock sample and related assumption，the relational expression of intensity change of sample and time under the action of sulphuric acid solution is deduced；and the calculated values are well in agreement with the measured data.
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Received: 03 March 2010
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2010, Vol. 29 
