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间歇性强降雨下基于Green-Ampt入 渗模型的边坡稳定性分析
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Slope Stability Analysis Based on Green-Ampt Infiltration Model under Intermittent Heavy Rainfall
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    摘要:

    研究了间歇性强降雨作用下边坡稳定性. 间歇性强降雨下湿润锋以上土体将会经受干湿循环作用,考虑干湿循环对边坡土体渗透特性及土水特性的影响,改进了传统Green-Ampt入渗(GA)模型;考虑干湿循环对土体强度的劣化作用,建立间歇性强降雨下边坡稳定性表达式.对于不考虑间歇性强降雨作用的边坡,改进GA模型可简化为传统GA模型,说明传统GA模型是改进GA模型的一个特例;利用改进GA模型和稳定性评价方法得到的结果与工程实际情况基本吻合,证明了该方法的可靠性;根据降雨入渗速率的变化特征,降雨过程可分为稳定阶段、持减阶段和突变阶段等3个阶段;传统GA模型与改进GA模型相比在失稳深度和时间上有较大延缓;仅改进稳定评价方法的传统GA模型与改进GA模型相比在失稳深度上一致,在失稳时间上有延缓.

    Abstract:

    The stability of slopes under intermittent heavy rainfall is studied. The soil above the wetting front is subjected to dry-wet cycles under intermittent heavy rainfall. Considering the influence of dry-wet cycles on the soil permeability and soil-water characteristics of slope,the traditional Green-Ampt infiltration (GA) model is improved. The expression of slope stability coefficient under intermittent heavy rainfall is established considering the deterioration of dry-wet cycles on soil strength. For slopes without considering intermittent heavy rainfall,the improved GA model can be simplified to the traditional GA model,which indicates that the traditional GA model is a special case of the improved GA model. The results obtained by using the improved GA model and the stability evaluation method are basically consistent with the actual engineering situation,which proves the reliability of the method. According to the variation characteristics of rainfall infiltration rate,the rainfall process can be divided into three stages: stable stage,continuous reduction stage and mutation stage. The slope infiltration depth and instability time of traditional GA are obviously behind that of the improved GA model. Compared with the improved GA model,the traditional GA model which only improves the stability evaluation method is consistent in the instability depth and delayed in the instability time.

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苏永华,李诚诚.间歇性强降雨下基于Green-Ampt入 渗模型的边坡稳定性分析[J].湖南大学学报:自然科学版,2020,47(3):28~36

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  • 在线发布日期: 2020-03-17
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