Stability analysis methods for the bedrock shallow slope considering rainfall types
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摘要: 降雨是诱发滑坡尤其是浅层滑坡的主要因素，目前多数降雨作用下基岩型浅层边坡稳定性分析方法都是基于常降雨强度假设，忽略了降雨特性对该类边坡稳定性的影响。文章建立了常规型降雨强度-时间类型，通过控制参数统一均匀型降雨、递增型降雨、递减型降雨、峰值型降雨等类型。根据入渗理论和无限边坡模型，提出了考虑降雨类型的基岩型浅层边坡稳定性分析方法。通过编制MATLAB程序计算一边坡稳定性，结果表明：不同降雨类型对基岩型浅层边坡稳定性影响较大，具有明显的时效性。在实际边坡防治中，应考虑降雨特性对边坡稳定性的影响。Abstract: The rainfall is a main factor causing shallow slope landslides. Most of the methods for analyzing the bedrock shallow slope stability are based on the assumption of constant rainfall, ignoring the influence of rainfall intensity changes on the slope stability. The theory for analyzing the stability of bedrock shallow slopes under rainfall action is still not perfect. In this paper, the conventional types of rainfall intensity-time type are established. Types of uniform rainfall, incremental rainfall, decreasing rainfall and peak rainfall are unified by controlling the parameters. Based on the seepage theory and the infinite slope models, a method for analyzing the stability of bedrock shallow slopes considering the rainfall characteristics is proposed in this paper. A MATLAB program is used to calculate the slope stability. The results show that the rainfall types have a great influence on the stability of bedrock shallow slopes and the influence is time-dependent. The influence of rainfall characteristics on the slope stability should be considered in the practical engineering.
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Key words:
- bedrock shallow slope /
- rainfall type /
- stability analysis /
- seepage theory /
- infinite slope model
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