Extralong waterdiversion
tunnels are widely used in interbasin water transfer
projects, and they are faced with many geohazard risks, such as water inrush,
rock collapse, and large deformation. To study the geological prediction methods
applicable to extralong TBM tunnels, the development
history and technical status of geohazard prediction and early warning
technologies are discussed. The challenges and issues faced in the development
of adverse geological prediction for extralong TBM
tunnels are summarized. To address these challenges, a fullcoverage geological prediction method system for extralong tunnels, namely, the "1 km+100 m+50 m" geological
prediction system, is developed. Then, the main components and the implementation
process of the "1 km+100 m+50 m" geological prediction system is
presented. This system consists of "1 km" macroscale geological prediction (kilometer scale), "100 m"
longdistance geological prediction (hundredmeter scale), and "50 m" shortdistance
precise prediction (tenmeter scale). By means of multisource integrated inversion analysis, the realization of fullcoverage prediction of adverse geological conditions and possible
geological disasters ahead of the tunnel face is achieved. The results from the
engineering applications using the "1 km+100 m+50 m" geological
prediction system in the water supply project Ⅱ in
Xinjiang show that this system can accurately predict the adverse geological
conditions and ensure the safe and efficient TBM tunneling operations for extralong tunnels.
DENG Mingjiang
,
XU Zhenhao
,
LIU Bin
. Establishment and Application of "1 km+100 m+50
m" Geological Prediction System for ExtraLong TBM Tunnels: a Case
Study on Water Supply Project Ⅱ in Xinjiang, China[J]. Tunnel Construction, 2021
, 41(9)
: 1433
-1450
.
DOI: 10.3973/j.issn.2096-4498.2021.09.001
