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基于Winkler地基模型的岩质隧道软弱底板塑性区研究

, PP. 82-90

Keywords: 隧道工程,岩质隧道,理论分析,软弱底板,支承压力,Winkler地基,塑性区深度

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Abstract:

?为了给侧墙及底板的支护设计及施工提供参考,根据隧道侧墙岩层及其受力特点,将侧墙视为一半无限承载梁,其软弱底板岩体简化为连续的弹性地基,建立了隧道侧墙在支承压力作用下的Winkler弹性地基梁模型,分析了侧墙任一界面上挠度、转角、弯矩及剪力的分布规律,推导了侧墙极限平衡区宽度与隧道埋深、底板岩体的弹性特征值、上覆岩层重度及侧墙应力集中系数、弹性区宽度、弹塑性界面上岩体抗剪强度的关系式。在确定侧墙极限平衡区宽度的基础上,探讨了隧道软弱底板在其侧墙挤压下产生的最大塑性区破坏深度。结果表明:底板最大塑性区破坏深度与隧道埋深、侧墙应力集中系数及其极限平衡区宽度、上覆岩层及底板重度、底板黏聚力及内摩擦角等参数密切相关。

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