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岩土体物理力学参数对岩质滑坡稳定性的影响
  • 期刊名称:煤田地质与勘探,2008,26(1):37-40.
  • 时间:0
  • 分类:TU457[建筑科学—岩土工程;建筑科学—土工工程] P315.3[天文地球—地震学;天文地球—固体地球物理学;天文地球—地球物理学]
  • 作者机构:[1]西南交通大学,四川成都610031, [2]中国水电工程顾问集团公司,北京100120, [3]水电水利规划设计总院,北京100120, [4]中国地震局工程力学研究所,黑龙江哈尔滨150080
  • 相关基金:国家自然科学基金项目(40702055);中国博士后基金(20080430884)
  • 相关项目:强震作用下层状结构岩质边坡变形破坏机理与防治对策研究
中文摘要:

基于显式波动有限元一极限平衡法,探讨了可靠度动力安全系数的可信度,研究了地震动峰值、频谱特性对岩质边坡安全系数的影响。研究结果表明,可靠度动力安全系数改变了以往稳定性评价指标与风险评价脱钩的做法,评价结果更为科学合理;地震动峰值基本不改变安全系数时程曲线的形状,但对安全系数的概率分布和标准差影响显著,并且与边坡安全系数呈负相关关系;地震动频谱特性对边坡可靠度动力安全系数的影响最大达到25%,不应忽视。

英文摘要:

Based on explicit fluctuations finite element- limit equilibrium method, the credibility of dynamic safety factor of reliability is explored, and the effects of peak and frequency of input ground motion on dynamic stability of rock slope are studied. The results show that, (a) the reliability dynamic safety factor is more reasonable, and can change the practice of decoupling the stability evaluation index and risk assessment, (b) the peak of input ground motion does not alter the shape of time history curve of safety factor, but significantly influences the probability distribution and standard deviation of safety factor, and has a negative relationship with safety factor of slope, and (c) the effect of frequency of input ground motion on reliability dynamic safety factor of rock slope can reach a maximum degree of 25%.

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