| 苏永华,刘少峰,毛克明,贺炜.某深埋隧道围岩破裂发展机理数值模拟[J].计算力学学报,2015,32(3):332~338 |
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| 某深埋隧道围岩破裂发展机理数值模拟 |
| Numerical analysis of rupture development mechanism for surrounding rock on digging within deep tunnel |
| 投稿时间：2014-03-12 修订日期：2014-05-24 |
| DOI：10.7511/jslx201503006 |
| 中文关键词: 深部隧道 分层断裂 应变软化 峰后脆性 力学机制 |
| 英文关键词:deep-buried tunnel layered fracture strain-softening peak-brittleness of rock mechanical-mechanism |
| 基金项目:国家自然科学基金(51378195,51078136)资助项目. |
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| 中文摘要: |
| 围绕某深埋隧道支护结构失效机理展开研究。调查了某深埋隧道围岩地质及支护结构失效特征,根据深埋隧道围岩的地质力学历史,提出岩石峰后力学特征描述的塑性应变指标。通过数值模拟获得在开挖扰动下该隧道围岩中应力大小的交替分布及围岩破裂的分层现象,分析了分层断裂中次生自由面、多重似开挖面形成的力学机制,揭示出武陵山脉隧道深埋段支护结构破坏的原因在于围岩的分层破裂。研究结果为深部隧道支护设计及稳定性分析提供了有效的思路与处理方法。 |
| 英文摘要: |
| This paper focuses on a study of failure mechanisms of a deep-buried tunnel supporting structure.Firstly,the geology of surrounding rock of a deep-buried tunnel and supporting structural failure characteristics were investigated.According to the deep tunnel rock geomechanical history,the plastic strain indicators of post-peak mechanical characteristic description of rock mass were proposed.Secon-dly,the stress alternate distribution and layered fracture phenomenon of surrounding rock under excavation were obtained by numerical simulation method,and an analysis of the mechanical mechanism on the formation of secondary free-surface and multiple excavation surface in layered fracture phenomenon.Finally,the reason why the supporting structure of Wuling mountain deep-buried tunnel section damaged is revealed to be the layered fracture of surrounding rock.The results provide an effective ideas and approach for supporting design and stability analysis of the deep-buried tunnel. |
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