To more finely guide the structural design of largecrosssection specialshaped shield tunnel under
the corresponding construction grouting load, a case study is conducted on the
quasirectangular shield tunnel project of Ningbo metro
line 3. The stress characteristics of the lining structure under construction
load and grouting conditions are explored, and the real grout filling and
diffusion processes and its pressure distribution law during synchronous
grouting are investigated. Finally, a comprehensive analysis is conducted on the
loading mode under grouting condition in the existing design model, the grout
filling diffusion pressure distribution calculation model, and the pressure
distribution pattern under special conditions. The results reveal the
following: (1) The structural force is more uniform according to the grout
filling and diffusion pressure analysis. (2) The structural force of the pipe
is more unfavorable under grout filling conditions of the existing design model
and load distribution under special conditions. (3) It is recommended to
consider the structural force pattern corresponding to the grout
circumferential filling and diffusion mechanism in the design model, and
superimpose distributed pressures of 100 kPa, 150 kPa, 200 kPa, and 250 kPa at
the crown, arch shoulder, waist, and bottom respectively.
LI Peinan, ZHAI Yixin, FAN Jie, CHEN Peixin
. Lining Structural Stress Analysis and Load Setting
under Grouting Condition of SpecialShaped Shield
Tunneling[J]. Tunnel Construction, 2022
, 42(S1)
: 212
-221
.
DOI: 10.3973/j.issn.2096-4498.2022.S1.025
