基于颗粒分形滑坡土体土水特征曲线评价及预测

Prediction and Evaluation on Soil Water Retention Curve of Landslide Soil Based on Fractal of Particles

滑带土与滑坡的发展、稳定性评价有着密切的关系,以福建永泰旗山滑坡为例,取代表性滑带土样和表层土样进行颗粒级配试验,基于分形理论研究了颗粒分形特征,结合压力板仪测定土样土水特征曲线,对滑带土和表层土进行了评价,并以颗粒分形维数预测了土水特征曲线,研究结果表明,滑带土细粒土含量较表层土含量高,滑坡土存在很好的分形特征,颗粒分形维数越大,细粒土含量越高,土体的持水性能也较好。以颗粒粒径分形维数代替土水特征分形维数,并结合Books-Corey模型来预测土水特征曲线,得到实测值与预测值呈现较好的一致性。

Sliding zone soil and landslide development, stability evaluation are closely related. The sliding zone soil and surface soil of Fujian Yongtai Qishan landslide are studied, the representative sample of soil is test for particle size distribution. Fractal feature of soil particles are analyzed based on fractal theory, combined with the pressure plate the soil water characteristic curve （SWCC） was measured. The sliding soil and surface soil were evaluated and SWCC was predicted based on fractal dimension of soil particles. The results indicate that the content of fine-grained soil of sliding zone soil are higher than surface soil. The soil of landslide is marked by fractal, with the increase of the fractal dimension the content of fine-grained soil increased, at the same time water holding capacity of the soil is also good. With the fractal dimension of soil particle instead of soil water characteristic fractal dimension and combining Books-Corey model to predict the soil water characteristic curve, the good fitted relationship between measured and predicted values are got.