降雨循环条件下高切坡稳定性演化过程及预测方法分析
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重庆交通大学

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P694

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Analysis of the Evolution Process and Prediction Method of High Shear Slope Stability under Rainfall Cycle
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chongqingjiaotong university

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    摘要:

    为进一步揭示降雨循环条件下基岩型台阶状高切坡的降雨入渗及稳定性演化过程,以乐西高速马边至昭觉段某粉质黏土覆盖层基岩型台阶状高切坡为研究对象,通过开展室内干湿循环试验建立了土体抗剪强度参数劣化数学模型;利用Geo-studio数值模拟软件开展了多工况降雨循环下高切坡降雨入渗过程研究,揭示了不同降雨循环工况下及雨后高切坡内部渗流场及稳定性变化规律,建立了降雨型高切坡稳定系数逐年劣化方程;结合室内试验及数值模拟结果,建立了该类高切坡稳定系数预测方法。研究结果表明:降雨入渗过程中高切坡潜在滑移面形状及位置并不发生明显变化,且表现为高切坡深处圆弧面及基岩积水面的组合型滑面;相同降雨时间内高切坡降雨入渗深度及稳定性劣化幅度与降雨强度成正相关;高切坡稳定性劣化效应与降雨循环次数成负相关;高切坡降雨入渗深度或入渗总量越大,雨后高切坡稳定系数回升越小;高切坡稳定系数劣化系数采用土体抗剪强度参数劣化系数平均值较为安全合理,本文所建降雨型高切坡稳定系数预测方法具有较高的精度。研究结果对反复循环周期性降雨工况下高切坡稳定性评价、预测预报及防治工作具有重要的科学指导意义及实用价值。

    Abstract:

    In order to further reveal the rainfall infiltration and stability evolution process of the bedrock-type stepped high-cut slope under rainfall cycle conditions, the bedrock-type stepped high-cut slope of a silty clay cover layer in the Mabian to Zhaojue section of the Lexi Expressway is taken as The research object was to establish a mathematical model for the deterioration of the shear strength parameters of the soil by carrying out the indoor dry-wet cycle test; the Geo-studio numerical simulation software was used to study the rainfall infiltration process of the high-cut slope under the multi-case rainfall cycle, which revealed different rainfall Under circulating conditions and after rain, the internal seepage field and stability change law of high-cut slopes were established, and the rainfall-induced high-cut slope stability coefficients deteriorated year by year; combined with laboratory tests and numerical simulation results, the prediction of such high-cut slope stability coefficients was established method. The research results show that the shape and position of the potential slip surface of the high-cut slope does not change significantly during the rainfall infiltration process, and it appears as a combined sliding surface at the depth of the high-cut slope and the water surface of the bedrock; the same rainfall time The rainfall infiltration depth and stability degradation amplitude of the internal high-cut slope are positively correlated with the rainfall intensity; the stability degradation effect of the high-cut slope is negatively correlated with the number of rainfall cycles; the greater the infiltration depth or the total amount of infiltration, the greater the rainfall The higher the stability coefficient of the high-cut slope is, the smaller the recovery coefficient is. It is relatively safe and reasonable to use the average value of the degradation coefficient of the shear strength parameter of the soil for the degradation coefficient of the high-cut slope stability coefficient. The research results have important scientific guidance significance and practical value for the evaluation, prediction and prevention of high-cut slope stability under repeated cycling and periodic rainfall conditions.

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  • 收稿日期:2020-07-06
  • 最后修改日期:2020-09-17
  • 录用日期:2020-09-25
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