Asymmetricallypressure in subsea tunnel
often causes rib spalling, water gushing and primary support deformation. Based
on the crosssea passage project from Xiamen island to
Xiang ′an in Xiamen metro line 3, measures of
geological prediction, stratum reinforcement, tunnel excavation and support and
risk management are analyzed. The results show that: (1)Due to the location of
subsea tunnel, in addition to the construction measures of advanced geological
prediction, advanced formation water plugging and reinforcement, and prevention
and control of sudden gushing, a set of strict emergency countermeasures
including rescue, disaster relief and prevention of sudden accidents should be
taken to guarantee absolute personnel and equipment safety. (2) In
construction, formation reinforcement and seepage control should be carried out
in time by advanced prereinforcement grouting
according to the variations of geological and hydrogeological conditions, and
it should be fully prepared at all times for possible emergency. （3) In broken, unsymmetricallypressured and
unstable stratum, the primary support, taking steel arch as the main supporting
parameter, has the advantage of high rigidity, high strength and being adaptive
to the stress of surrounding rock after tunnel excavation, thus it can effectively
control the initial deformation after excavation in weak surrounding rock
tunnel. (4) In excavation, a certain amount of backfill slag and an emergency
operation platform should be prepared so that quick rescue and efficient work
can be done with low cost in emergency event.
ZHANG Yanwei, SHI Quanqiang, ZHENG Qingjun
.
Research on Antigush Technology for
Asymmetrically Pressured Section with Weathered Sac in DrillingandBlasting Subsea Tunnel
under
High Water Pressure
[J]. Tunnel Construction, 2021
, 41(S1)
: 367
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.047
