When opentunnel boring machine (TBM)
boring through a highpressure waterrich weakfracture altered structural belt,
problems, such as surrounding rock deformation, difficult borehole drilling,
difficult support, cutterhead jamming, shield jamming, and mud burstcaused shield burial, are often encountered. Two openTBMs were applied to the Gaoligongshan tunnel of the DaliRuili railway in extremely complex strata in southwest Yunnan, and
they crossed highpressure waterrich weakfracture altered structural belts
at section PDZK221+481. Research is conducted on key TBM construction
technologies, i.e. primary support reinforcement measures, drilling technology,
advanced reinforcement measures, sidewall heading depressurization measures,
TBM jammingrelease technology, and adverse geology
tunneling and support measures. Then, some corresponding countermeasures, such
as geological detection with a high small pilot tunnel, advanced drainage
depressurization with sidewall heading, insitu
advanced pipe roof and grouting reinforcement, jamming release with shield
expanding excavation and release, and cutterhead jamming release with cleaning
periphery of the cutterhead after chemical grouting reinforcement of the tunnel
surface, and primary support strengthening, are taken. Moreover, the crosssection form and support measures for the sidewall heading and pipe
roof chamber, and support measures for advanced reinforcement are put forward.
WANG Yafeng
,
ZENG Jing
,
JIANG Jiayun
.
Construction Technology of Open TBM in Gaoligongshan
Tunnel Crossing a
HighPressure WaterRich WeakFracture Altered Structural Belt
[J]. Tunnel Construction, 2021
, 41(3)
: 449
-457
.
DOI: 10.3973/j.issn.2096-4498.2021.03.014
