The construction methods,
longitudinal profile, cross-section
layout, construction organization, shield type selection, and shield launching
in ultra-deep shaft of the Shu′an
tunnel are comprehensively analyzed using data research, engineering analogy,
and experience summary methods. Findings are as follows: (1) The construction
methods for urban railway tunnels should be based on a comprehensive comparison
of geological conditions, construction environmental conditions, and
construction duration. Shield method is a priority when there are applying
conditions due to its high safety, minimal environmental impact, and fast
construction progress. (2) When tunnels primarily pass through weakly permeable
mudstone strata, the earth pressure balance shield is recommended. For locally
highly permeable strata, measures such as surface dewatering, double-gate screw conveyor, and injection ports for modifiers could be
adopted. (3) The phenomena of mud cake on cutterhead and segment floating can
be avoided by optimizing the arrangement of cutting tools on cutterhead,
enhancing the connection stiffness of the segments, and adopting synchronous
dual-component grouting. (4) An advance pilot tunnel by
mining method for shield launching shaft can realize high efficiency separate
launching of shield.
QI Chun
,
YU Yu
,
PANG Tao
,
LIU Jinsong
,
TIAN Siming
,
WANG Chuang
,
LUO Lusen
. General Design Scheme For
Shu′an Tunnel of Chengdu-Chongqing Midline Railway[J]. Tunnel Construction, 2024
, 44(S2)
: 391
-398
.
DOI: 10.3973/j.issn.2096-4498.2024.S2.039
