金川导流洞进口边坡地质条件较为复杂, 有多组断层及裂隙发育, 开挖后形成高陡边坡, 边坡稳定问题较为突出。首先以有限元软件ADINA为平台, 对预应力锚索、锁口锚索以及锚筋桩进行敏感性计算, 做出锚固措施的优化分析;然后使用有限差分软件FLAC3D建立开挖锚固完成后的三维边坡模型, 计算了边坡在天然、开挖、加固等5种工况下的边坡安全稳定状况。计算结果论证了锚固方案的合理性, 揭示边坡在不同工况中可能发生失稳的部位, 对工程建设具有一定指导意义。
Abstract
The geological condition of slope at the inlet of Jinchuan Hydropower Project’s diversion tunnel is complex with several groups of developed faults and fissures, which gave rise to high and steep slope after excavation and brought about stability problem. In the present paper, sensitivity computations on pre-stressed anchor cable, lock anchor cable and anchor pile were carried out by using finite element software ADINA, and optimized measures of anchor reinforcement were presented. In subsequence, finite difference software FLAC3D was employed to build a three-dimensional model of excavated and anchored slope. The safety and stability of slope under natural condition, excavating condition, reinforcing condition and other three conditions are calculated. The calculation results demonstrated the rationality of the anchoring scheme, and revealed the unstable position under different conditions. This research has guiding significance for engineering construction.
关键词
导流洞进口边坡 /
开挖 /
锚固 /
有限元 /
有限差分
Key words
inlet slope of diversion tunnel /
excavation /
anchoring /
finite element /
finite difference
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基金
湖北省教育厅科学技术研究计划优秀中青年人才项目(Q20111203);湖北省宜昌市科学技术研究与开发项目(A201230201);三峡大学硕士学位论文培优基金(2013PY003)
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