Research on infinite slope stability calculation model with non-uniform distribution of initial water content
The rainfall infiltration model in combination with slope stability analysis is an effective approach to analyze rainfall-induced shallow landslides.This paper considered the influence of non-uniform distribution of initial water content on stability,proposed a simplified calculation model of infinite slope stability with linear distribution of initial water content based on the existing literature,and verified the feasibility and calculation accuracy of the model by using Mein-Larson infiltration model and numerical simulation method.The paper discussed the influence of rainfall intensity p,linear rate of change of water content k,and initial surface wa-ter content θ0 on the calculation accuracy of the model under the same soil and slope conditions.The results show that the simplified model can describe the infiltration process of constant rainfall more accurately and is suitable for the stability analysis of infinite slopes when the rainfall intensity is greater than the infiltration ca-pacity of soil;when the simplified model is used for stability calculation,the change of k value has a signifi-cant influence on the calculation accuracy of infiltration depth Zw when p is the same,while the influence on the calculation accuracy of factor of safety Fs is generally insignificant;for an infinite slope with a given soil texture and slope angle,when the value of θ0 is 0.15 and the value of k is 0.07,the accuracy of Zw calculated by this model is the highest;compared with strict numerical simulation method,the formula of the simplified model proposed in this paper is simpler and takes less time to calculate,which improves the calculation effi-ciency to a certain extent.The results provide reference for the stability analysis of rainfall-type landslides.
rainfall infiltrationinitial water contentshallow landslideinfinite slopeslope stability
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