摘要
针对地震效应带来的地面峰值加速度随机性对边坡可靠度的影响问题,首先从场地等效剪切波速和地震基岩输入峰值加速度入手,研究地震地面峰值加速度的概率分布规律,根据影响边坡稳定性的不确定指标,利用蒙特卡洛法模拟计算三种不同工况条件下边坡稳定性最小安全系数,拟合得到了边坡稳定性最小安全系数的概率密度分布函数。其次,通过边坡稳定性最小安全系数的概率密度分布函数,分析考虑地震峰值加速度随机性对边坡可靠度的影响规律。研究结果显示:随着地震地面峰值加速度的增大,边坡的最小安全系数呈现出逐渐减小的趋势;在计入地震随机性效应时,边坡的失效概率相较于未考虑地震随机性效应的情况有显著增加,可靠度明显降低;随着边坡失效安全系数阈值的增大,边坡失效概率随之增大,其可靠度指标下降。
Regarding the issue of the impact of the randomness of the ground peak acceleration induced by seismic effects on the reliability of slopes,initially,commencing from the equivalent shear wave velocity of the site and the input peak acceleration of the seismic bedrock,the probability distribution law of the seismic peak ground acceleration is explored.Subsequently,in line with the uncertain indicators affecting slope stability,the minimum safety factor of slope stability under three distinct working conditions is simulated and computed via the Monte Carlo method,and the probability density distribution function of the minimum safety factor of slope stability is acquired through fitting.Secondly,by means of the probability density distribution function of the minimum safety factor of slope stability,the influence law of considering the randomness of the seismic peak acceleration on the reliability of slopes is analyzed.The research results show that:with the augmentation of the seismic ground peak acceleration,the minimum safety factor of the slope exhibits a progressively decreasing tendency;when the seismic randomness effect is incorporated,the failure probability of the slope is substantially elevated in comparison to the scenario without considering the seismic randomness effect,and the reliability is markedly diminished;with the increment of the threshold value of the slope failure safety factor,the failure probability of the slope correspondingly increases,and its reliability index declines.
作者
梁师俊
蒋蓓
Liang Shijun;Jiang Bei(Department of Building Services Engineering,Zhejiang College of Construction,Hangzhou 311231,China;Department of Architecture Engineering,Zhejiang College of Construction,Hangzhou 311231,China)
出处
《建筑科学》
北大核心
2025年第7期169-178,共10页
Building Science
关键词
峰值加速度
随机
边坡
稳定性
可靠度
peak acceleration
random
slope
stability
reliability
