Multi-scale chemo-mechanical analysis of the slip surface of landslides in the Three Gorges, China
Multi-scale chemo-mechanical analysis of the slip surface of landslides in the Three Gorges, China
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DOI：
10.1007/s11431-011-4370-8
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发表时间：
2011-04
期刊：
影响因子：
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通讯作者：
Yu Zhao;P. Cui;L. Hu;T. Hueckel
中科院分区：
文献类型：
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作者：
Yu Zhao;P. Cui;L. Hu;T. Hueckel
探讨了滑面强度变化演化过程中的多尺度化学力学效应和微观破坏模式。采用直剪仪、扫描电镜和X射线衍射等方法，对三峡库区重塑土滑带土的强度变化进行了跟踪研究。结果表明，碱金属的释放和粘土矿物在表面的浓缩。在试验过程中，钾离子释放，胶结作用减弱，层间矿物比例随强度变化而变化。相应地，伊利石或蒙脱石-伊利石混合物转变为蒙脱石。因此，强度的变化来源于分子尺度上碱金属离子的释放，导致粘土矿物在细观尺度上的富集和转变。滑裂面和土体强度的演化是一个典型的结构变化和化学-力学耦合的多尺度过程。
Multi-scale chemo-mechanical effects and microscopic failure modes are explored in the evolution of strength change of slip surface. Direct shear equipments, scanning electro-microscope and X-ray diffraction are used to trace the change in strength of remodeled soils of slip surfaces in the Three Gorges area. Results show that there is a release of alkali metals and concentration of clay minerals on the surface. During the tests, potassium ions were released, the cementation was reduced, and the ratio of interlayer minerals varied associated with strength change. Accordingly, illites or montmorillonite-illite mixtures turned into montmorillonite. So the strength change originates from the release of alkali metal ions on molecular scale that leads to the concentration and transition of clay minerals on meso-scale. The evolution of slip surface and soil strength is a typical process involving multi-scale processes of structure changes and chemo-mechanical coupling.