不同前期降雨与土-水特征曲线对边坡稳定的影响

唐栋; 祁小辉; 蒋水华; 李典庆

doi:10.11779/CJGE2015S1029

不同前期降雨与土-水特征曲线对边坡稳定的影响 English Version

唐栋^{1, 2},
祁小辉^{1, 2},
蒋水华^{1, 2},
李典庆^1,2,

1. 武汉大学水资源与水电工程科学国家重点实验室,湖北武汉 430072; 2. 武汉大学水工岩石力学教育部重点实验室,湖北武汉 430072

基金项目: 国家自然科学基金项目（51225903,51329901）; 湖北省自; 然科学基金创新群体项目（2014CFA001）

详细信息

作者简介:
唐栋(1988- ),男,博士研究生,主要从事岩土工程可靠度分析与风险控制方面的研究。

通讯作者:
李典庆

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出版历程
- 收稿日期: 2015-03-25
- 发布日期: 2015-07-24

Effect of different antecedent rainfalls and SWCCs on slope stability

TANG Dong^{1, 2},
QI Xiao-hui^{1, 2},
JIANG Shui-hua^{1, 2},
LI Dian-qing^1,2,

1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China; 2. Key Laboratory of Rock Mechanics in Hydraulic Structural Engineering, Ministry of Education, Wuhan University, Wuhan 430072, China

摘要

摘要: 以一均质边坡模型为例,研究了在土-水特征曲线（SWCC）中当土体饱和渗透系数保持不变,而其它参数变化情况下,不同前期降雨类型对边坡稳定的影响。结果表明：边坡稳定受土-水特征曲线参数不同程度的影响,其中进气值a对边坡稳定的影响最大,n值的影响相对较小。在不考虑主降雨情况下,当a值较小时,前期降雨主要引起边坡表层孔隙水压力的变化,对边坡安全系数影响并不大;当a值较大时,前期降雨的影响范围增大,甚至使地下水位抬升,对边坡安全系数影响较大,且后锋型前期降雨影响最大。考虑有主降雨情况下,当a值较小时,前期降雨类型对主降雨阶段边坡稳定几乎没有影响;当a值较大时,前期降雨类型将导致主降雨开始时刻孔隙水压力分布差异很大,进而导致主降雨阶段边坡最小安全系数差别很大;n值越大,边坡孔隙水压力受到的影响越大,从而导致主降雨阶段边坡最小安全系数也更小。
- 前期降雨 /
- 土-水特征曲线 /
- 非饱和渗流 /
- 边坡稳定
Abstract: A homogeneous slope model is taken as an example to investigate the effect of antecedent rainfall patterns and soil-water characteristic curves (SWCC) on slope stability when the saturated permeability coefficient keeps constant, while other parameters vary. The results indicate that the slope stability is affected by soil-water characteristic curve (SWCC) parameters in varying degrees, and the air entry value a has the maximum influence on the slope stability, while n has relatively small influence. Without considering the major rainfall, when a is small, the antecedent rainfall only causes changes of pore water pressure in the shallow part of the slope and has little influence on the safety factor of the slope. While a is large, the depth influenced by antecedent rainfall increases, the water table even raises, thus the slope stability is influenced more. The effect of the antecedent rainfall patterns with a peak on slope stability is more significant than that of the average rainfall type, and the delayed antecedent rainfall influences the most. If the condition with the main rainfall is considered, the antecedent rainfall type will have little influence on the stability of slope when a is small, while it will cause the difference in distribution of pore water pressureat the beginning of the main rainfall when a is large, which further leads to the difference in the minimum factor safety during the main rainfall. The larger n is, the larger pore water pressure in the slope is influenced, and the smaller the lowest safety factor at the major rainfall stage.
- antecedent rainfall /
- soil-water characteristic curve /
- unsaturated seepage /
- slope stability

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参考文献(14)

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