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运用分形模型预测非饱和土的水理特性,主要研究了降雨条件下非饱和土边坡的稳定性变化及影响边坡稳定性的各个因素:土质特性参数(分维、进气值与饱和导水系数)、降雨强度、边坡几何特性参数及初始地下水位深度等。土体的饱和导水系数、降雨强度对降雨过程中的非饱和土边坡稳定性影响较大;非饱和土边坡在降雨过程中的最小安全系数与土体饱和导水系数之间的临界关系可用Sigmoid曲线模型拟合;降雨强度直接影响了非饱和土边坡的稳定性,降雨过程中边坡的最小安全系数与降雨强度的关系曲线可用MMF模型拟合;另一方面,非饱和土的分维、进气值、边坡几何特性参数及初始地下水位深度的影响相对较小。
The fractal model is used to predict the hydraulic characteristics of unsaturated soils. The main research is on the stability changes of unsaturated soils and the various factors that influence the stability of the slope under rainfall conditions: soil characteristics (fractal dimension, Water coefficient), rainfall intensity, slope geometry parameters and initial groundwater table depth. The saturated hydraulic conductivity and rainfall intensity of soil have a great influence on the stability of unsaturated soil slope during rainfall. The critical value between the minimum safety factor of unsaturated soil slope during rainfall and the saturated hydraulic conductivity of soil The relationship can be fitted by Sigmoid curve model. The rainfall intensity has a direct impact on the stability of unsaturated soil slopes. The curve of the minimum safety factor of slope and rainfall intensity during rainfall can be fitted by MMF model. On the other hand, unsaturated soil Fractal dimension, air intake value, geometric parameters of slope and depth of initial groundwater level are relatively small.