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走滑活断层对公路的致灾机理研究

, PP. 35-41

Keywords: 道路工程,走滑活断层,结构力学方法,致灾机理,有限元法,破坏模式

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Abstract:

？为了研究公路穿过走滑活断层时的变形、受力机理和破坏特征,建立了有限元地质模型,分析了活断层的走滑位移、活断层带宽度以及活断层与公路夹角等变化的影响效应;并在此基础上,研究走滑活断层环境下公路的破坏模式,提出了公路变形、受力的结构力学求解方法。结果表明:走滑断层带的公路在横向发生弯曲变形,公路两侧的边缘在纵向处于拉、压的受力状态;活断层走滑位移的变化,只改变公路变形和受力的大小,不改变其分布特征;活断层与公路夹角以及活断层带宽度的变化,不改变公路变形和受剪的整体范围,但是对公路变形和剪应力分布特征有较大影响;根据走滑活断层环境下公路的变形和受力特征,可以将其破坏模式总结为剪断破坏和拉-张破坏。

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