To investigate the advantages of earth pressure
balance(EPB)/tunnel boring machine(TBM) dualmode shield tunneling in
complex strata such as soil, soilrock combination
strata, and longdistance hard rock, and the regularity
of tunneling parameters and cutter consumption in various strata under dual
modes, a case study is conducted on leftline
excavation in the HuaideFuyong section of the Shenzhen
metro. Then, the construction parameters from shield launching to mode
conversion and construction completion period of tunnel excavation are
collected, the parameter variations and tunneling efficiency of shield
tunneling in different strata under the same mode and those in same strata
under different mode are comparatively examined, and the parameter factor
affecting construction efficiency is analyzed. It is concluded that: (1) Under
EPB mode, the influence of soil pressure and cutter rotation speed on
excavation parameters is significant. In soft soil layer, to guarantee the
ground deformation within the design range, the soil pressure should be lowered
as far as possible; in rock formation, the height of muck accumulation should
be minimized, and the cutter rotation speed should be increased so as to
improve the construction efficiency. (2) Under TBM mode, the excavation
parameters are mainly affected by the degree of joint development of rock mass.
The main parameters such as rotation speed and penetration degree should be
adjusted in time to improve the construction efficiency. The cutting tool
consumption locations and causes are analyzed when tunneling in hard rock
formation with different geologies and modes, and the suggestion of reducing
secondary abrasion of disc cutter induced by residue in the soil chamber is
proposed to reduce the cutting tool consumption in fullface hard rock formation.
JIA Ke
,
SONG Tiantian
,
SUN Qianwei
,
WANG Pinghao
,
LOU Yonglu
,
YANG Junwu
. Analysis of Tunneling Performance of Earth Pressure
Balance/Tunnel Boring
Machine DoubleMode Shield in Complex Strat#br#[J]. Tunnel Construction, 2022
, 42(S2)
: 479
-486
.
DOI: 10.3973/j.issn.2096-4498.2022.S2.060
