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.
陈馈
,
冯欢欢
,
贺飞
. Challenges in Tunnel Construction and Preliminary
Study on Innovative TBM Design for SichuanTibet
Railway[J]. Tunnel Construction, 2021
, 41(2)
: 165
-174
.
DOI: 10.3973/j.issn.2096-4498.2021.02.002
