| 浅埋圆形隧道开挖面稳定的可靠度分析 |
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| 引用本文： | 王俊峰,高广运,张蕾.浅埋圆形隧道开挖面稳定的可靠度分析[J].岩土工程技术,2011,25(1):44-48. |
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| 作者姓名： | 王俊峰 高广运 张蕾 |
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| 作者单位： | 同济大学岩土及地下工程教育部重点实验室,上海,200092 |
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| 基金项目： | 上海市重点学科建设资助项目，上海市规土局资助项目 |
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| 摘 要： | 开挖面支护压力是影响隧道开挖面稳定的重要施工因素，也是进行隧道开挖稳定性可靠度分析的关键。采用FLAC3D软件计算开挖面的最小极限支护压力，结合响应面法计算浅埋圆形隧道开挖面稳定的可靠度指标卢，将土体粘聚力和内摩擦角作为随机变量，考虑土体粘聚力和内摩擦角之间的相关性。分析结果表明，不考虑参数相关性计算得到的可靠性指标偏于保守。通过计算验算点处的极限支护压力与原支护压力比较，证明响应面法在结合FLAC3D计算开挖面稳定的可靠度方面是足够准确的。
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| 关 键 词： | 盾构隧道 极限支护压力 FLAC3D 开挖面稳定性 可靠度 |
Analysis on ReliabiIity of Excavation Face Stability in Shallow Circular Tunnel |
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| Wang Junfeng,Gao Guangyun,Zhang Lei.Analysis on ReliabiIity of Excavation Face Stability in Shallow Circular Tunnel[J].Geotechnical Engineering Technique,2011,25(1):44-48. |
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| Authors: | Wang Junfeng Gao Guangyun Zhang Lei |
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| Institution: | Wang Junfeng Gao Guangyun Zhang Lei (Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji Univesity, Shanghai 200092, China) |
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| Abstract: | Support pressure is a significant factor which influences on stability of excavation face in a shallow circular tunnel driven by a pressurized shield, which is also a key point in reliability analysis. FLACaD simulation and response surface methodology is utilized for the reliability index 13 for ultimate state. Both soil shear strength parameters are considered as random variables as the ultimate state studying and also taking into account the statistical correlation between cohesion and internal friction angle. Finally, the assumption of uncorrelated variables was found conservative in comparison to the assumption of negatively correlated variables. |
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| Keywords: | FLAC3D |
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