陕北Q2黄土入渗模型优化及边坡稳定性分析

采用Brooks&Corey土水特征曲线公式对Green-Ampt模型中入渗剖面的非饱和过渡区进行计算,得到优化的Green-Ampt公式;引入湿润层重分布比例函数的概念,采用Seep/W模拟非饱和土壤水分性质数据库（UNSODA）中256个样本10种类型土的降雨入渗过程,得到湿润层重分布函数的解析表达式;基于本文改进的Green-Ampt模型、湿润层重分布函数及Frdlund抗剪强度公式,推导出改进的边坡稳定计算公式;以陕北延安地区樊庄Q2黄土高边坡为算例与前人修正过的Green-Ampt模型解结果进行对比,验证新模型的适用性,经验证本文改进的Green-Ampt模型适用性好。

Optimization of Q2 Loess Infiltration Model and Slope Stability Analysis in Northern Shaanxi

The unsaturated transition zone of infiltration profile in Green-Ampt model is calculated by Brooks & Corey soil-water characteristic curve formula, and the optimized Green-Ampt formula is obtained. The concept of wet layer redistribution proportion function is introduced, and the rainfall infiltration process of 256 samples and 10 types of soil in Unsaturated Soil Hydraulic Database (UNSODA) is simulated by seep/W, and the analytical expression of wet layer redistribution function is obtained. Based on the improved Green-Ampt model, wet layer redistribution function and Frdlund shear strength formula, the improved slope stability calculation formula is deduced. Taking Fanzhuang Q₂ loess high slope in Yan'an area of Northern Shaanxi as an example, the applicability of the new model is verified by comparing with the solution results of the previous modified Green-AMPT model, which proves that the modified Green-AMPT model in this paper has good applicability.