Law and Mechanism of Shear Degradation of Mica Quartz Schist under Dry-Wet Cycles
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摘要: 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.Abstract: 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.
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Key words:
- mica quartz schist /
- dry-wet cycles /
- shear strength /
- deterioration mechanism /
- engineering geology
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图 3 干湿循环作用下云母石英片岩吸水率变化规律
Fig. 3. Water absorption variation of mica quartz schist under different dry-wet cycles
图 4 干湿循环作用下云母石英片岩峰值剪应力变化规律
Fig. 4. Peak shear stress variation of mica quartz schist under dry-wet cycles
图 6 内摩擦角和粘聚力总劣化曲线
Fig. 6. Total deterioration curve of internal friction angle and cohesion
图 7 干湿循环作用下不同岩石粘聚力劣化度变化规律
Fig. 7. Variation of cohesion deterioration of different rocks under dry-wet cycles
图 8 干湿循环作用下不同岩石内摩擦角劣化度变化规律
Fig. 8. Variation of friction angle deterioration of different rocks under dry-wet cycles
图 9 直剪试验前后试样破坏面灰度值分布直方图
Fig. 9. Histogram of the gray value distribution of the failure surface before and after the direct shear test
图 10 试样剪切破坏面分割方法处理前后对比
Fig. 10. Comparison of shear failure surface segmentation method of schist sample before and after treatment
图 11 干湿循环作用下试样剪切面摩擦损伤度变化曲线
Fig. 11. Variation curves of shear surface friction damage of shear surface under dry-wet cycles
图 12 不同干湿循环作用下垂直片理SEM照片（×1 200倍）
Fig. 12. SEM pictures of vertical foliation under different dry-wet cycles(×1 200 times)
图 13 不同干湿循环作用下平行片理SEM照片（×1 200倍）
Fig. 13. SEM pictures of parallel foliation under different dry-wet cycles(×1 200 times)
图 14 干湿循环作用下云母石英片岩劣化过程
Fig. 14. Diagram of mica quartz schist deterioration mechanism under wet-dry cycles
表 1 干湿循环作用下云母石英片岩直剪试验结果
Table 1. Direct shear test results of mica quartz schist under wet-dry cycles
岩样编号 干湿循环次数 法向应力$ {\sigma }_{n} $(MPa) 峰值剪应力$ {\tau }_{\mathrm{m}\mathrm{a}\mathrm{x}} $(MPa) 残余剪应力$ {\tau }^{\text{'}} $(MPa) 粘聚力c(MPa) 内摩擦角$ \varphi $ (°) 残余粘聚力$ {c}^{\text{'}} $(MPa) 残余内摩擦角$ {\varphi }^{\mathrm{\text{'}}} $ (°) S1-0-1 0 3.00 18.81 11.16 16.89 39.01 8.77 39.35 S1-0-2 6.00 22.64 14.03 S1-0-3 9.00 24.23 15.63 S1-0-4 12.00 26.46 18.81 S1-0-5 15.00 27.42 21.05 S1-1-1 1 3.00 18.18 10.2 16.07 36.65 8.36 37.81 S1-1-2 6.00 20.09 12.76 S1-1-3 9.00 22.00 13.71 S1-1-4 12.00 24.55 17.54 S1-1-5 15.00 26.15 19.45 S1-2-1 3 3.00 17.80 9.89 15.25 35.45 8.13 36.24 S1-2-2 6.00 18.54 12.75 S1-2-3 9.00 21.68 13.39 S1-2-4 12.00 23.28 15.94 S1-2-5 15.00 25.66 17.54 S1-3-1 5 3.00 16.58 9.57 13.81 34.29 7.75 35.45 S1-3-2 6.00 17.54 12.43 S1-3-3 9.00 19.45 13.07 S1-3-4 12.00 22.96 15.64 S1-3-5 15.00 24.55 16.90 S1-4-1 10 3.00 15.94 8.85 13.17 34.21 7.13 31.63 S1-4-2 6.00 16.58 10.84 S1-4-3 9.00 18.18 13.07 S1-4-4 12.00 22.32 15.63 S1-4-5 15.00 24.23 16.58 S1-5-1 15 3.00 15.63 8.44 12.76 33.82 6.47 31.17 S1-5-2 6.00 16.43 10.84 S1-5-3 9.00 17.86 12.12 S1-5-4 12.00 21.36 12.27 S1-5-5 15.00 23.28 15.31 S1-6-1 20 3.00 15.31 8.29 12.40 33.02 6.29 30.86 S1-6-2 6.00 15.94 10.65 S1-6-3 9.00 17.22 12.12 S1-6-4 12.00 20.73 12.27 S1-6-5 15.00 22.96 15.31 
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