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首页> 外文期刊>Arabian Journal for Science and Engineering >Study on Deterioration of Strength Parameters of Sandstone Under the Action of Dry-Wet Cycles in Acid and Alkaline Environment
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Study on Deterioration of Strength Parameters of Sandstone Under the Action of Dry-Wet Cycles in Acid and Alkaline Environment

机译：酸性和碱性环境下干湿循环作用下砂岩强度参数的劣化研究

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摘要

In order to study the deterioration of strength parameters of sandstone under the action of dry-wet cycles in acid and alkaline environment, laboratory tests were conducted on the sandstone specimens for 1, 3, 6 and 10 dry-wet cycles in the solutions with a pH value of 4, 7 and 9, respectively. With the strength data recorded after each cycle, the Mohr-Coulomb strength criterion parameters and the Hoek-Brown strength criterion parameters were obtained. First, the rock deterioration was briefly analyzed. Then, the failure envelopes and the failure surface on the plane at different pH values after different cycles were graphed. The results show that the parameters decrease with the increase in dry-wet cycles. The deterioration is most serious when the number of cycles is small, and then becomes moderate. In addition, the deterioration coefficient of the sandstone is the largest in acidic environment (), followed by that in alkaline environment () and that in neutral environment (). The deterioration effects of drying and wetting on the following parameters are as follows: fitting compressive strength cohesion material constant internal friction angle. When the pH value of the soaking solution changes from 7 to 4, the deterioration coefficients of the fitting compressive strength and cohesion rise by 30%, while those of the material constant and internal friction angle rise by 10%.
机译：为了研究在酸性和碱性环境下干湿循环作用下砂岩强度参数的劣化，在溶液中对砂岩样品进行了1、3、6和10次干湿循环的实验室测试。 pH值分别为4、7和9。通过在每个循环之后记录强度数据，获得了莫尔-库仑强度标准参数和霍克-布朗强度标准参数。首先，简要分析了岩石变质。然后，绘制在不同循环后在不同pH值下的失效包络线和失效平面图。结果表明，参数随着干湿循环的增加而减小。当循环次数少时，恶化最严重，然后变得中等。此外，砂岩的变质系数在酸性环境（）中最大，其次在碱性环境（）和中性环境（）中。干燥和润湿对以下参数的恶化影响如下：拟合抗压强度>内聚力>材料常数>内摩擦角。当浸泡溶液的pH值从7变为4时，装配抗压强度和内聚力的降低系数增加30％，而材料常数和内摩擦角的降低系数增加10％。

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