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干湿循环作用下云母石英片岩抗剪性能劣化规律及机理
李志刚, 叶宏林, 代云云, 徐光黎, 盛逸凡, 马郧
PDF(3861 KB)
PDF(3861 KB)
干湿循环作用下云母石英片岩抗剪性能劣化规律及机理
Law and Mechanism of Shear Degradation of Mica Quartz Schist under Dry-Wet Cycles
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在干湿循环作用下，片岩的抗剪性能劣化对片岩边坡长期稳定性具有重要影响.以鄂西北广泛分布的云母石英片岩为研究对象，通过开展一系列室内试验，揭示其抗剪性能劣化规律及机理.吸水性试验及直剪试验结果表明，云母石英片岩的吸水率随着干湿循环次数增加呈逐渐上升的趋势，抗剪强度及残余抗剪强度随干湿循环次数的增加呈逐渐下降的趋势，抗剪性能劣化效应明显.结合扫描电镜测试所得云母石英片岩微观结构变化规律，揭示其抗剪性能劣化机理：干湿循环作用下，云母石英片岩片理面逐渐扩展开裂，内部矿物颗粒强度软化，颗粒间胶结弱化，岩石骨架变得松散；粘聚力主要受矿物颗粒之间的胶结程度影响，劣化速率较快；内摩擦角主要受矿物颗粒嵌固程度和颗粒本身强度的影响，劣化速度相对较慢.
The deterioration of shear properties of schist under dry-wet cycles has an important effect on the long-term stability of schist slope. Taking the mica-quartz schist widely distributed in Northwest Hubei as the research object, a series of laboratory tests were carried out to reveal the law and mechanism of its shear deterioration. The results of water absorption tests and direct shear tests show that the water absorption of mica-quartz schist increases, while the shear strength and residual shear strength decrease gradually with the increase of the number of dry-wet cycles, and the shear properties show obvious deterioration effect. Based on the changes of mica-quartz schist microstructure obtained by scanning electron microscopy, the deterioration mechanism of mica-quartz schist is revealed. Under the action of dry-wet cycles, the schist plane gradually expands and cracks, the strength of internal mineral particles is softened, the cementation between particles is weakened, and the rock skeleton becomes loose. What’s more, the cohesion is mainly affected by the degree of cementation between mineral particles, so the deterioration rate is fast. While the internal friction angle is mainly affected by the degree of embeddedness and the strength of mineral particles, so the deterioration rate is relatively slow.
云母石英片岩 / 干湿循环 / 抗剪强度 / 劣化机理 / 工程地质
mica quartz schist / dry-wet cycles / shear strength / deterioration mechanism / engineering geology
P642.3
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感谢匿名审稿专家提出的有益建议！
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