基于BN的软岩隧道大变形风险机理与评估

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Abstract Research purposes: In high geostress tunnels, the occurrence of large deformation of soft rock has great uncertainty, which is a major difficulty in risk assessment. In order to accurately and effectively assess the large deformation risk of soft rock tunnels, a hierarchical evaluation method for large deformation is proposed based on Bayesian network (BN). Relied on the Yuntunbao tunnel, soft rock large deformation risk database is established and the six major risk sources are identified and reasoned.
Research conclusions: (1) The large deformation of soft rock in tunnel is the result of multi factor coupling. By establishing the risk database, the mechanism is divided into two aspects: surrounding rock stability and support stability, and the Bayesian network model and a priori probability are established; (2) Through Bayesian sensitivity analysis, the key factors about the large deformation in soft rock tunnel are integrity of surrounding rock, support strength, ground stress, rock strength, construction method and tunnel shape; (3) Through the update of the risk database during the construction, the Bayesian network can well predict the probability of large deformation of the soft rock during the construction period.

Key words： soft rock tunnel large deformation risk assessment stress-strength ratio Bayesian network

Received: 08 September 2021

PACS:

U459.2

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	Articles by authors
	YANG Jianhui
	SHEN Kai
	SHU Lushan
	XUE Yadong
	WANG Jianjiang

Cite this article:

YANG Jianhui,SHEN Kai,SHU Lushan, et al. Risk Mechanism and Assessment of Large Deformation in Soft Rock Tunnel[J]. Journal of Railway Engineering Society, 2022, 39(3): 81-86.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I3/81

[1]	何春保,舒丽红.兰渝铁路高地应力软岩隧道变形机理和施工控制[J].铁道工程学报,2014(5):68-73.He Chunbao,Shu Lihong.Deformation Mechanization and Construction Control of High Ground Stresses Soft Rock Tunnel in Lanzhou-Chongqing Railway[J]. Journal of Railway Engineering Society,2014(5):68-73.
[2]	宋章,杜宇本,陶玉敬,等.强震区成兰铁路某隧道大变形地质成因分析[J].铁道工程学报,2016(10):90-96.Song Zhang, Du Yuben, Tao Yujing,etc.Analysis of the Geologic Origin of Large Deformation of a Tunnel of Chengdu-Lanzhou Railway in Meizoseismal Areas[J]. Journal of Railway Engineering Society,2016(10):90-96.
[3]	钟友江,刘世杰,吴建和.双层初期支护在云屯堡隧道高地应力软岩洞段中的应用[J].隧道建设,2020(1):90-98.Zhong Youjiang, Liu Shijie, Wu Jianhe.Application of Double Primary Support to High Geostress Soft Rock Section of Yuntunbao Tunnel[J].Tunnel Construction,2020(1):90-98.
[4]	王志杰,李振,蒋新政,等.新建隧道双侧近接既有隧道施工风险评价研究[J].铁道工程学报,2020(5):47-53.Wang Zhijie, Li Zhen, Jiang Xinzheng, etc.Research on the Construction Risk Assessment of New Tunnels Close to Existing Tunnel on Both Sides[J]. Journal of Railway Engineering Society, 2020(5):47-53.
[5]	谢欣,吕波,王利宁,等.基于数据融合的山岭隧道围岩稳定性评价方法[J].地下空间与工程学报,2020(4):1108-1115.Xie Xin, Lv Bo, Wang Lining, etc.Data Fusion Based Surrounding Rock Stability Assessment on a Deep Burden Tunnel[J].Chinese Journal of Underground Space and Engineering, 2020(4):1108-1115.
[6]	刘高,张帆宇,李新召,等.木寨岭隧道大变形特征及机理分析[J].岩石力学与工程学报,2005(S2):5521-5526.Liu Gao, Zhang Fanyu, Li Xinzhao, etc. Research on Large Deformation and Its Mechanism of Muzhailing Tunnel[J].Chinese Journal of Rock Mechanics and Engineering,2005(S2):5521-5526.