ISSN 2096-4498
CN 44-1745/U
Tunnel Construction ›› 2021, Vol. 41 ›› Issue (2): 165-174.DOI: 10.3973/j.issn.2096-4498.2021.02.002
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CHEN Kui1,2, FENG Huanhuan1, 2, HE Fei3
Online:
Published:
Abstract: SichuanTibet Railway is the most challenging railway project worldwide to date due to its great elevation difference, intensive tectonic activities, frequent mountain disasters, fragile ecological environment and severe hypoxia at high altitude. In this paper, the challenges to be encountered during TBM construction for SichuanTibet Railway under various complex conditions, including numerous long and large tunnels, high insitu stresses, and highly active faults etc., are described in details. Innovative design concepts and characteristics of TBMs for construction of SichuanTibet Railway are systematically analyzed in eight aspects such as alpinecold condition, longdistance driving in hard rock and rockburst etc. From these analysis, conclusions are drawn as follows: (1) Advanced geological probing and treatment is a main means of risk control for TBM tunneling during construction of SichuanTibet Railway tunnels. (2) It is particularly necessary to adopt innovative design TBM with "dual shield + rock bolt & shotcrete" or dualsupport TBM for constructing rockburst prone tunnels. (3) For tunnels prone to large deformation, open dualmode TBMs or TBMs with innovative structure design are preferred. It is expected to provide some reference for targeted TBM design and tunnel construction in the later stage.
Key words: SichuanTibet Railway, extralong tunnel, TBM, alpinecold condition; high insitu stress, high ground temperature, adverse geological conditions
CLC Number:
U 45
CHEN Kui, FENG Huanhuan, HE Fei. Challenges in Tunnel Construction and Preliminary Study on Innovative TBM Design for SichuanTibet Railway[J]. Tunnel Construction, 2021, 41(2): 165-174.
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URL: http://www.suidaojs.com/EN/10.3973/j.issn.2096-4498.2021.02.002
http://www.suidaojs.com/EN/Y2021/V41/I2/165
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