The construction methods
for large-diameter vertical shafts of
deep highway tunnels (700 m) in cold and high-altitude
areas are hard to choose. Therefore, based on severe environmental requirements
of Xinjiang, China, complex engineering geologies of the Tianshan, urgent need
for ventilation in the "three-hole"
combination of drilling and blasting method and TBM method, as well as various
factors such as construction conditions, construction period, and cost control,
a survey is conducted on various shaft excavation methods such as top-down boring method, raise-boring method,
drilling method, and vertical tunneling machine method with different shaft
depths in different industries globally. Then comprehensive comparison is
conducted in terms of geological adaptability, construction period
requirements, site conditions, technical maturity, safety, environmental
protection, and cost. Based on the construction experience of the 2-2 vertical
shaft project of the Tianshan Shengli tunnel, some conclusions are drawn as
follows: (1) The top-down boring, raise-boring, and
drilling methods are mature in coal mine projects, and corollary equipment is
complete, whereas they are new in 700 m-deep vertical
shafts with great difficulty. (2) Before construction of the shaft, the
permeability coefficient, water inflow, rock lithology, strength, location and
length of fracture zone should be investigated and rechecked in detail. (3) The
drilling method will increase the cost and construction period when applying in
hard rocks, which should be carefully selected. (4) The super-deep vertical shaft tunneling equipment and technology are still in
the exploratory stage, the cost will be drastically increased due to long
equipment manufacturing period, slurry pump replacement, deviation correction,
grease leakage of cutterhead, and frequent cutter replacement.
ZHU Ronghui, PEI Hongyu, YU Fangzheng, HUANG Dengxia, LI Jian, WANG Zhiyuan, ZHAO Yongxiang
.
Comparison and Selection of Excavation Methods for Super-Large Vertical Shafts in a 700 m Deep Highway Tunnel: A Case Study of 2-2 Shaft of Tianshan Shengli Tunnel
[J]. Tunnel Construction, 2024
, 44(S1)
: 355
-367
.
DOI: 10.3973/j.issn.2096-4498.2024.S1.039
