降雨-堆载耦合作用下深厚填土边坡稳定性分析

Stability analysis of deep fill slope under the influence of rainfall-surcharge coupling

摘要:

以湖北咸宁某深厚填土边坡为工程背景，采用Geo-studio数值模拟软件，进行了降雨-堆载耦合作用下深厚填土边坡稳定性数值模拟分析，研究了降雨作用下边坡内部孔隙水压力分布特征，探究了降雨持续时间及坡顶堆载对边坡稳定系数的影响规律，结果表明：初始边坡在降雨及坡顶堆载条件下处于欠稳定状态，且边坡稳定系数随着降雨时间的增加逐渐减小，与降雨因素相比，坡顶堆载对该处边坡稳定性影响更大。据此提出了刷坡减载及防水护坡的边坡防护方案，边坡稳定性数值模拟分析结果表明处理后边坡稳定性较好，满足建筑工程要求，同时也验证了数值分析结果的合理性和有效性。

Abstract:

This paper takes a deep fill slop in Xianning Hubei as the construction background. The numerical simulation software—Geo-studio was adopted to analyze the influence of rainfall-surcharge coupling effect on the stability of deep fill slope， the pore water pressure distribution inside the slope and the influence of constant rainfall and surcharge at the top of slope on the stability coefficient were also analyzed. The results showed that the original slope was in metastable state under the condition of rainfall and surcharge at the top of slope， the stability coefficient decreased with the rainfalls time， compared with the constant rainfall， the surcharge load had a greater impact on the stability of fill slope. To the end， a reinforcement scheme of a slope scouring and load reduction and waterproof surface was proposed. The numerical simulation results confirmed the feasibility of the scheme， which meet the requirement of the construction， meanwihile， the rationality and validity of the simulation results were verified.