酸性条件下砂岩剪切破坏特性试验研究

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Abstract The fine sandstone from the Xujiahe group of Three Gorges reservoir area is selected as object. The effect of various acid solutions with different pH values on sandstone under shearing load is investigated by using the independent development of meso-shear test equipment for coal rock. Simultaneously，temporal and spatial evolution law of microcrack of sandstone sample under the shear loading is researched by image processing technology. The relationship between the crack initiation and the degree of sandstone erosion was investigated. The results show that there is obvious correlation between the shear stress and crack evolution of sandstone at different time points，and process from surface crack?s initiation to the unstable failure of the samples was completed in a relatively short time. In the process of rupture failure of sandstone，it almost produced intergranular fracture in the mineral grain boundaries and cements，and transgranular fracture only produced in highly concentrated region of stress. Furthermore，as the increase of acidic strength of solution and time of erosion，the erosion degree and the deformation of sandstone increased，while the shear strength reduced and the width of crack corresponding increased，crack situation was more complex. Therefore，chemical solution is an important factor which affects the rock?s strength and deformation attenuation.

Key words： rock mechanics shearing load sandstone acidic environment erosion water-rock interaction

Received: 14 April 2012

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http://www.rockmech.org/EN/Y2012/V31/Is2/3897

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