Comprehensive Classification of Surrounding Rock of Deep BuriedLong Hydraulic Tunnel Constructed with  Tunnel Boring Machine

SI Fu-an; LI Kun; DUAN Shi-wei

doi:10.11988/ckyyb.20200567

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Journal of Changjiang River Scientific Research Institute ›› 2020, Vol. 37 ›› Issue (8) : 150-154. DOI: 10.11988/ckyyb.20200567

2020 ANNUAL CONFERENCE (ACADEMIC SEMINAR) OF SURVEY SPECIALIZEDCOMMITTEE OF CHINESE HYDRAULIC ENGINEERING SOCIETY

Comprehensive Classification of Surrounding Rock of Deep BuriedLong Hydraulic Tunnel Constructed with Tunnel Boring Machine

SI Fu-an, LI Kun, DUAN Shi-wei

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Abstract

Commonly applied methods of classifying the surrounding rock of hydraulic tunnels are based on the construction of shallow buried tunnels and drilling and blasting. Such classifications show poor adaptability to deep buried long hydraulic tunnels constructed with tunnel boring machine (TBM). On the basis of classification methods in China and abroad, we propose a comprehensive classification method which describes not only the surrounding rock stability, and also the types and levels of geological risks for deep buried long hydraulic tunnels constructed with TBM. According to the characteristics of deep buried long hydraulic tunnels and the main geological risks that may be encountered during TBM construction, we select some major assessment factors inclusive of surrounding rock stability, high geostress risk, groundwater risk, as well as excavability. The proposed method is applied to a water conveyance project in Xinjiang and has achieved good result. The research offers technical support for the excavation and support design of deep buried hydraulic tunnel, and also can be regarded as a basis for targeted treatment of possible geological risks during TBM construction.

Key words

deep buried long hydraulic tunnel / TBM / geological investigation / geological risk / engineering rock mass classification

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SI Fu-an, LI Kun, DUAN Shi-wei. Comprehensive Classification of Surrounding Rock of Deep BuriedLong Hydraulic Tunnel Constructed with Tunnel Boring Machine[J]. Journal of Changjiang River Scientific Research Institute. 2020, 37(8): 150-154 https://doi.org/10.11988/ckyyb.20200567

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