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地震作用下边坡代表性滑动面识别及系统可靠度确定

Identification of representative sliding surfaces of slope under earthquake and evaluation of system reliability
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摘要 在地震作用下边坡工程的失稳破坏是工程灾害的主要类型。对于一个地震作用下的黏性土边坡,采用拟静力方法简化水平地震作用,设计基本地震加速度变化范围为0.0~0.4 g,利用传统系统可靠度计算方法和基于k-means法识别代表性滑动面分别确定相应的边坡系统可靠度。结果表明:随着地震水平加速度的增加,边坡的系统失效概率呈非线性增加。由最不利单一滑动面计算的失效概率约是系统失效概率的50%,以最不利单一滑动面的失效概率表示边坡的失效概率会明显高估边坡整体的安全,这表明计算系统失效概率的必要性。基于k-means法识别代表性滑动面所得系统可靠度方法的计算量明显降低,失效概率的精度略有降低但偏于安全。 The instability failure of slope engineering under earthquake is the main type of engineering disaster.For a cohesive soil slope under earthquake action,the pseudo-static method is adopted to simplify the horizontal seismic action,and the basic seismic acceleration is designed to vary from 0.0~0.4 g.The traditional system reliability calculation method and the representative sliding surfaces identified k-means method are used to determine the corresponding slope system reliability.The results show that the system failure probability of slope increases nonlinearly with the increase of seismic horizontal acceleration.The failure probability calculated by the most unfavorable single sliding surface is about 50%of the system failure probability.The failure probability of the most unfavorable single sliding surface will obviously overestimate the overall safety of the slope,which indicates the necessity of calculating the system failure probability.The calculation amount of the system reliability method based on k-means identification of representative sliding surfaces is significantly reduced,and the precision of failure probability is slightly reduced but safe.
作者 鲍俊文 赵少飞 李萍萍 刘子源 BAO Junwen;ZHAO Shaofei;LI Pingping;LIU Ziyuan(North China Institute of Science and Technology,Yanjiao,065201,China)
机构地区 华北科技学院
出处 《华北科技学院学报》 2023年第3期60-64,共5页 Journal of North China Institute of Science and Technology
关键词 边坡 稳定性 地震作用 代表性滑动面识别 系统可靠度 slope stability earthquake representative sliding surface recognition system reliability
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