The construction of traffic and ventilation tunnels in
pumped storage power stations often presents challenges for conventional tunnel
boring machines(TBMs) due to their large excavation sections, small horizontal
turning radii, as well as large and frequently changing longitudinal slope gradients.
Therefore, a case study is conducted on the Funing pumpedstorage
power station to analyze the focal points and difficulties of TBM construction
in traffic and ventilation tunnels with large diameters, ultrasmall turning
radii, and large slopes. A TBM designed with an ultrasmall turning radius,
suitable for large excavation sections and slopes, is designed considering the
overall selection scheme, key component design, and innovative slag
transportation methods. The study concludes that: (1) The designed TBM is
feasible for constructing traffic and ventilation tunnels with a large
diameter, an ultrasmall turning radius, and a large slope. It offers
environmentally friendly, green, lowcarbon, and highly
efficient technology. (2) The doubleshield main body
combined with boltshotcrete support can adapt to large
diameters and ultrasmall turning radii. (3) The integration of a steel bar
storage and discharge system onto the support shield of the doubleshield TBM is feasible. (4) The mucking system of the "rotating
stack platform and rubbertire selfdumping truck" can address the challenges of TBM slag and
material transportation under conditions of large longitudinal slopes and
continuous ultrasmall turning radii, and the construction cost and failure rate
are relatively low. However, it affects TBM tunneling speed and hinders
material transportation and personnel passage during mucking, resulting in an
uncivilized construction phenomenon. (5) The combined belt conveyor system is
favorable for slag transportation under continuous ultrasmall turning radii and
large slope conditions, considerably improving TBM excavation speed. However,
the belt deviation adjustment technology and "multilevel control and
sequential start and stop" control system need to be further investigated.
WANG Pengxing
,
HE Fei
,
NING Xiangke
,
SENG Xiongfei
. Research and Application of Key Technologies of Large
Diameter Tunnel Boring Machine with Large Slope and UltraSmall
Turning Radius[J]. Tunnel Construction, 2023
, 43(9)
: 1614
-1622
.
DOI: 10.3973/j.issn.2096-4498.2023.09.019
