The haunch height and
sidewall compression ratio are key factors influencing the mechanical
performance of bolted-connected
slab-assembly precast utility tunnels. To investigate
their effects, a nonlinear finite element (FE) model of the lower edge node is
developed using ABAQUS software. The model′s accuracy
is validated through low-cycle repeated load tests
conducted on lower edge nodes in prior research. Based on this, a nonlinear FE
model of the entire tunnel structure is constructed, and a parametric analysis
is performed. The main parameters include haunch heights of 0, 100, 200, and
250 mm, and sidewall axial compression ratios of 0, 0.05, and 0.1. The results
indicate the following: (1) The overall structure primarily undergoes bending
failure, with forward ultimate bearing capacities ranging from 210.5 to 306.8
kN and ductility coefficients from 3.57 to 4.01. (2) Compared to the case with
zero haunch height, the ultimate bearing capacities increase by 16.6%, 27.5%,
and 31.7% for haunch heights of 100, 200, and 250 mm, respectively, while the
ductility coefficients decrease by 3.24%, 3.51%, and 9.46%. (3) Compared to the
case with a sidewall axial compression ratio of zero, the ultimate bearing
capacities increase by 5.4% and 14.3% for compression ratios of 0.05 and 0.1,
respectively, with corresponding increases in ductility coefficients of 12.32%
and 10.36%.
LI Zihao
,
CHEN Shengyang
,
YAN Jiajia
,
XUE Weichen
. Mechanical Properties of
Overall Structure of Bolted Connected Slab-Assembly Precast Utility Tunnels[J]. Tunnel Construction, 2025
, 45(6)
: 1154
-1162
.
DOI: 10.3973/j.issn.2096-4498.2025.06.010
