林锋,任伟中,魏潇阳

• 1:绍兴文理学院土木工程学院
• 2:中国科学院武汉岩土力学研究所
• 3:中国科学院大学

摘要(Abstract)：

【目的】降雨入渗对边坡的稳定性分析具有很大的影响。Green-Ampt模型常用于降雨入渗问题的分析，但其部分假设条件与实际情况有较大差异。为了得到更加符合实际的计算结果【方法】在Green-Ampt模型的基础上做了一定改进：在稳定降雨强度条件下，基于分层假设，将湿润区分为饱和区、过渡区、初始区，同时考虑了有限长边坡饱和区的坡面渗流作用，以粉土为例，假设入渗初期雨水完全渗入土体中，将入渗过程中的两阶段入渗(降雨强度控制阶段、土体入渗能力控制阶段)分别进行分析，并对渗透系数进行修正，得到入渗深度随时间的变化规律曲线，称为PSGA模型。以改进的PSGA入渗模型对边坡稳定性进行分析，此处考虑降雨入渗区均处于地下水位以上，并分别选取湿润锋、饱和区-非饱和区交界面作为危险滑动面进行计算，取较小值得到边坡安全系数随入渗时间的变化。最后采用PSGA模型对张家湾滑坡进行降雨入渗和稳定性分析。【结果】结果显示：从误差分析可知PSGA模型计算结果相较GA、SGA、MSGA模型更为精确；根据边坡稳定性分析：GA模型最早达到临界安全系数(2.71 h),其次为PSGA模型(4.74 h),最后为PSGA模型(6.27 h);对张家湾滑坡进行稳定性分析：相比SGA模型，PSGA模型计算结果更接近实际情况。【结论】结果表明：PSGA模型计算精度更高，也更符合实际情况；PSGA入渗模型得到的临界失稳时间较传统GA入渗模型更长，较SGA入渗模型更短；在坡长较小时，边坡饱和区的渗流作用对湿润锋深度的影响较大；通过PSGA模型对张家湾滑坡进行分析验证了该模型的合理性。

关键词(KeyWords)： 降雨入渗;PSGA模型;渗流;边坡稳定性;临界失稳

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2021YFC1523400)

作者(Author): 林锋,任伟中,魏潇阳

DOI: 10.13928/j.cnki.wrahe.2025.09.017

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