To investigate the optimal distribution of doublesealing
gaskets in largediameter shield tunnels, a refined
numerical simulation method that accounts for the detailed structure of joints
and plastic damage to concrete is utilized. The effectiveness of the method is
validated through a fullscale bending test of joints.
The analysis compares the mechanical properties and waterproofing performance
of joints with gaskets arranged outside the bolt hole(SGOH) and on both sides
of the bolt hole(SGBH). The findings are as follows: (1) The refined simulation
accurately reflects the compressionbending performance
of the joints. (2) The height, opening, and bolt stress in the compression area
of the joint progress through four stages with increasing bending moments,
thereby enhancing the bending resistance owing to the improved contact at the outer
edge of the compression side. (3) Axial force significantly influences the
retention of initial bending stiffness, showing a complex relationship in which
stiffness decreases under high axial forces. (4) SGBH exhibits slightly better
hogging than sagging performance, while SGOH exhibits significantly better
hogging than sagging performance. (5) The arrangement of the doublesealing gaskets affects bending stiffness in relation to axial
force, additional bending moments, and the height of the concrete in the core
area. (6) Under sagging moments, the waterproofing performance of SGBH is
superior to that of SGOH; however, the roles reverse under hogging moments.
SGBH, demonstrating superior positive bending and waterproofing performance
when at least one side of the gasket is compressed, is found to be more
applicable.
YANG Siqi
,
WU Huaina
,
CHEN Renpeng
,
CUI Qinglong
,
YANG Linsong
. Influence of Distribution Form of DoubleSealing
Gaskets on Mechanical Properties of Joints in LargeDiameter
Shield Tunnels[J]. Tunnel Construction, 2024
, 44(4)
: 750
-761
.
DOI: 10.3973/j.issn.2096-4498.2024.04.013
