水化学环境变化对泥质岩胀缩性的影响

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Abstract The swell-shrink properties of argillaceous rock under varying aqueous environmental chemistry were studied by free swell test. Influence of the orientation of bedding，the same kind and different concentration aqueous solution，the same concentration and different valences of cation aqueous solution，the different chemical paths on the free swelling of argillaceous rock were analyzed. The essential mechanism of swelling and shrinkage variant of argillaceous rock were discussed by using SEM-EDS. Following results have been gotten：(1) The swelling of argillaceous rock decreases with the increases of angle between the horizontal plane of the device and the bedding plane of rock sample. (2) The concentration and cation valences of aqueous solution strongly influence the swelling and shrinkage of argillaceous rock under saturated conditions. The more concentrated the solution is，the weaker the swelling is under same kind aqueous solution. The more valence the cation is，the weaker the swelling is under same concentration and same negative ions kinds aqueous solution. The swelling and shrinkage of argillaceous rock connected with its go through chemical path under different kinds and different concentrations. (3) Argillaceous rock shrank when the low-concentration and low-valence cations aqueous solutions were displaced by the high-valence cations. (4) The swelling of argillaceous rock is connected with the proportions of low-valence and high-valence cations in the sample；the bigger the proportion is，the stronger the swelling is.

Key words： rock mechanics argillaceous rock aqueous environmental chemistry swell-shrink property cation

Received: 14 June 2012

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https://rockmech.whrsm.ac.cn/EN/Y2013/V32/I2/281

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