岩体结构面对隧道围岩失稳的作用

李 永宽, 卢 涵, 熊 志平
云南德成规划设计有限公司

摘要


岩体结构面的空间展布、力学参数及组合关系，决定隧道围岩整体的稳定状态，结构面存在会削弱岩体完整程度，引发局部应力集中，推动裂隙相互贯通，形成可滑移区域或易脱落块体带，结构面倾向与开挖扰动形成相互作用时，围岩易出现偏压形变、楔体滑动、层状剥离等破坏形式。结构面粗糙程度、闭合状态及充填物差异，会改变岩体抗剪能力，让围岩在受力与卸力过程中表现出复杂力学反应，研究结构面的控制作用，能够还原围岩破坏的发展过程，为预判变形区段与构建稳定方案提供理论支撑。

关键词


岩体结构面；隧道围岩；失稳机制；块体控制；裂隙网络

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参考


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