To fully study the geological adaptability of TBM in
SichuanTibet railway tunnel construction, the main unfavorable geological
conditions of SichuanTibet railway tunnel are
comprehensively analyzed and the adaptability characteristics of TBM are
systematically studied. With analysis of the four aspects of geological
conditions, i.e. rock burst, large deformation of soft rock, water inrush, and
high ground temperature, it is demonstrated that the geological adaptability of
TBM construction is weak. The key techniques of TBM construction are described
as follows: (1) In the area of rockburst and large deformation of soft rock,
corresponding support and construction countermeasures should be taken
according to geological prediction and field conditions. (2)For fractured
seepage and nonfractured water inrush, the
construction of water inrush section can be treated by hydraulic shunt drainage
or grouting plugging and reinforcment. (3) In addition to the conventional
ventilation physical cooling measures in the construction of high ground
temperature section, limited drainage and grouting should be adopted to reduce
the amount of hot water gushing in the hightemperature
section with rich hot water, and structural heat prevention should be adopted.
WANG Yanjie, LI Cangsong, SHI Yongyue, ZHANG Tao, WANG Bin
. Adaptability Analysis of TBM in Main Unfavorable
Geological of Sichuan-Tibet Railway Tunnel and Its Key
Construction Technologies[J]. Tunnel Construction, 2021
, 41(S1)
: 470
.
DOI: 10.3973/j.issn.2096-4498.2021.S1.062
