In order to ensure the implementation of the first
longdistance shield tunnel crossing underneath airport area in waterrich sandy cobble strata in China, as well as connection gallery of
tunnel project by freezing method in Chengdu, measures, i.e. project
comparison, expert demonstration, design optimization, numerical calculation
and field monitoring data analysis, are adopted, and a series technical
measures, i.e. optimization design of overall engineering planning,
optimization of shield configuration, clay shock method, land sonar cavity
detection, pregrouting for connection gallery and
water stop by of freezing method, etc., are put forward. The practical results
show that: (1) Major technical problems of longdistance
shield tunnel crossing underneath airport area in waterrich sandy cobble strata can be successfully solved by using shield
construction method, optimizing the horizontal and vertical crosssection design, adding a middle ventilation shaft to greatly reduce
the single driving distance of shield to about 1 km, and adopting strict
settlement control measures. (2) The composite water stop scheme proposed, i.e.
water stop in tunnel by double grouting + freezing reinforcement, can achieve
good effect in waterrich sandy cobble strata.
SONG Jie
. Technology for Longdistance Shield Tunnel
Crossing Airport Area in Waterrich Sandy Cobble Strata[J]. Tunnel Construction, 2020
, 40(S1)
: 288
-296
.
DOI: 10.3973/j.issn.2096-4498.2020.S1.037
