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| Numerical analysis of rupture development mechanism for surrounding rock on digging within deep tunnel |
| Received:March 12, 2014 Revised:May 24, 2014 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7511/jslx201503006 |
| KeyWord:deep-buried tunnel layered fracture strain-softening peak-brittleness of rock mechanical-mechanism |
| Author | Institution |
| 苏永华 |
湖南大学 土木工程学院, 长沙 |
| 刘少峰 |
湖南大学 土木工程学院, 长沙 |
| 毛克明 |
湖南大学 土木工程学院, 长沙 |
| 贺炜 |
长沙理工大学 土木与建筑学院, 长沙 |
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| Abstract: |
| 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. |