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Soil-Water Characteristics of Undisturbed Net-Like Red Soils in Xuancheng, China

机译：宣城市原状网状红壤的土壤水特征

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Red soils with white net-like veins occur widely along the south of middle to lower reaches of the Yangtze River in China. Up to present few studies paid attentions on hydraulic and unsaturated mechanical aspect in spite of many investigations focusing on age, distribution, and climate significance. However, the soil-water characteristics are critical for understanding the engineering features. Herein, microstructure features of undisturbed red soils with white net-like veins taken from Chenshan laterite section in Xuancheng, China were analyzed by scanning electron microscope (SEM). And the soil-water characteristics curves (SWCCs) were discussed by means of unsaturated GDS triaxial stress path system and numerical simulation. The SWCC test of axial pressure 510kPa and radial pressure 505kPa was conducted. The Gardner model, Van Genuchten model and Fredlund model were used to simulate the measured drying cycle of SWCC. The results of SEM tests showed that microstructures and micro-pores are of obvious anisotropy, and the measured SWCC of the net-like red soil during wetting process behaves hysteretic characteristics compared to that during drying process. The computed results indicated that the simulation value of Fredlund model does good agreement with measured value.
机译：长江中下游以南地区广泛分布着带有白色网状脉的红色土壤。尽管有许多关于年龄，分布和气候意义的研究，但到目前为止，很少有研究关注水力和非饱和机械方面。但是，土壤水的特征对于理解工程特征至关重要。本文通过扫描电子显微镜（SEM）分析了中国宣城市晨山红土带未受干扰的白色网状脉动红壤的微观结构特征。通过非饱和GDS三轴应力路径系统和数值模拟，探讨了土壤水特征曲线（SWCCs）。进行了轴向压力510kPa和径向压力505kPa的SWCC测试。使用Gardner模型，Van Genuchten模型和Fredlund模型来模拟SWCC的测量干燥周期。 SEM测试结果表明，微结构和微孔具有明显的各向异性，与干燥过程相比，网状红土在润湿过程中测得的SWCC表现出滞后特性。计算结果表明，Fredlund模型的仿真值与实测值吻合良好。

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