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首页> 外文期刊>Acta Geotechnica: An International journal for Geoengineering >Weakening laws of slip zone soils during wetting-drying cycles based on fractal theory: a case study in the Three Gorges Reservoir (China)
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Weakening laws of slip zone soils during wetting-drying cycles based on fractal theory: a case study in the Three Gorges Reservoir (China)

机译：基于分形理论的润湿干燥循环过程中滑动区土壤的弱化 - 三峡库区案例研究（中国）

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摘要

Slip zone soils play a crucial role in the evolution of landslides. In this paper, slip zone soils of the Huangtupo Landslide in the Three Gorges Reservoir area, which is an ancient landslide affected by water level fluctuation, are taken as an example to research the influence of wetting-drying cycles on soil properties. The mercury intrusion porosimetry test is used to study the soil's microstructure, while the triaxial test is used to measure the mechanical parameters. The experimental results indicate that the wetting-drying cycles can change the micropore structures and macro-mechanical properties of the soils. Meanwhile, it is demonstrated that there is a certain relationship between the macro- and micro-properties. From the microcosmic perspective, the fractal structure unit formed in the long-term geological environment is the key factor affecting the mechanical properties of the slip zone soils. Then, based on fractal theory, a weakening model of slip zone soils during wetting-drying cycles is proposed. The correctness and reliability of the model are verified by the mechanical parameters from triaxial tests. Finally, it is indicated that the weakening model can be used to forecast the weakening coefficient of slip zone soils under wetting-drying action, which results from the periodic fluctuations of the reservoir level.
机译：滑动区土壤在山体滑坡演变中发挥着至关重要的作用。本文采用了三峡水库区的黄台山滑坡滑动区土壤，这是一种受水平波动影响的古老滑坡，作为研究润湿干燥循环对土壤性质的影响。汞侵入孔隙测定法试验用于研究土壤的微观结构，而三轴试验用于测量机械参数。实验结果表明，润湿干燥循环可以改变微孔结构和土壤的宏观力学性能。同时，证明宏观和微观特性之间存在一定的关系。从微观角度来看，长期地质环境中形成的分形结构单元是影响滑动区土壤的机械性能的关键因素。然后，基于分形理论，提出了润湿干燥循环期间的滑区土壤弱化模型。通过三轴测试的机械参数验证了模型的正确性和可靠性。最后，结果表明，弱化模型可用于预测润湿干燥作用下的滑动区土壤的弱化系数，这由储层水平的周期性波动导致。

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