重复荷载作用下加筋挡土墙的疲劳寿命分析

Fatigue Life Analysis on Reinforced Earth Retaining Walls under Cyclic Load

疲劳分析是要确定加筋土挡土结构的疲劳寿命,通过输入不同幅值和频率的正弦波激励,探讨了重复荷载作用下模型挡墙的动力特性与疲劳寿命规律。试验结果分析表明,三种加筋结构的疲劳寿命与其应力幅值均成线性关系,格宾加筋挡土墙的对数疲劳寿命随应力幅的变化的敏感程度比土工格栅加筋挡土墙的要低。试验分析结果有助于揭示挡墙在重复荷载作用下的失稳机制,为加筋挡土墙工程设计提供有益的参考。

Fatigue analysis is to determine the fatigue life of reinforced earth retaining wall.The dynamic characteristics and fatigue behaviors of reinforced earth retaining walls under sine wave excitation of different amplitudes and frequencies were studied.Test results show that the relationships between fatigue life of these three reinforced earth structures and stress amplitude are linear.The logarithm fatigue life of reinforced gabion retaining wall is less influenced by stress amplitude than geogrid reinforced retaining wall.Test results are able to reveal failure mechanism of retaining wall under cyclic load,and also provide a useful reference for engineering design of reinforced earth retaining wall.