1. Key Laboratory of Urban Security and Disaster Engineering, Ministry of Education, Beijing University of Technology, Beijing 100124, China 2. Nantong Railway Construction Component Co., Ltd., Nantong 226000, China
The integrity and bearing capacity of segment joints in shield tunnels are associated closely with the mechanical properties of the joints. This study focuses on the mechanical characteristics and mechanism of a bolted circumferential joint during the entire bearing process. Simplified analytical algorithms for four stress stages are established to describe the bearing behaviors of the joint under a compressive bending load. A height adjustment coefficient, α, for the outer concrete compression zone is introduced into a simplified analytical model. Factors affecting α are determined, and the degree of influence of these factors is investigated via orthogonal numerical simulations. The numerical results show that α can be specified as approximately 0.2 for most metro shield tunnels in China. Subsequently, a case study is performed to verify the rationality of the simplified theoretical analysis for the segment joint via numerical simulations and experiments. Using the proposed simplified analytical algorithms, a parametric investigation is conducted to discuss the factors affecting the ultimate compressive bending capacity of the joint. The method for optimizing the joint flexural stiffness is clarified. The results of this study can provide a theoretical basis for optimizing the design and prediciting the damage of bolted segment joints in shield tunnels.
distance between bolt and inner edge of segment (mm)
joint gap (mm)
1
0.32
35
110
2
2
0.40
40
120
4
3
0.48
45
130
6
4
0.56
50
140
8
Tab.1
parameter
size (mm)
H
300
600
200
39
35–50
25
110–140
2–8
Tab.2
Fig.5
number
M/N (m)
caulking width of sealing gasket (mm)
distance between bolt and inner edge of segment (mm)
joint gap (mm)
black column
α
1
0.32
35
110
2
1
0.216
2
0.32
40
120
4
2
0.206
3
0.32
45
130
6
3
0.206
4
0.32
50
140
8
4
0.186
5
0.4
35
120
6
4
0.198
6
0.4
40
110
8
3
0.173
7
0.4
45
140
2
2
0.200
8
0.4
50
130
4
1
0.206
9
0.48
35
130
8
2
0.169
10
0.48
40
140
6
1
0.205
11
0.48
45
110
4
4
0.206
12
0.48
50
120
2
3
0.200
13
0.56
35
140
4
3
0.206
14
0.56
40
130
2
4
0.200
15
0.56
45
120
8
1
0.181
16
0.56
50
110
6
2
0.206
Tab.3
item
M/N (m)
caulking width of sealing gasket
distance between bolt and inner edge of segment
joint gap
black column
K1
0.203515
0.197271
0.200192
0.204034
0.20205
K2
0.194192
0.195974
0.196231
0.205874
0.195233
K3
0.195033
0.198226
0.19525
0.203682
0.196188
K4
0.198227
0.199496
0.199293
0.177376
0.197495
R
0.009323
0.003522
0.004942
0.028498
0.006818
optimal level
1
4
1
2
–
Tab.4
sources of variation
sum of squares
DOF
mean square
F
P
significance level
M/N
2.14e–4
3
7.13e–5
1.96
–
*
caulking width of sealing gasket
2.66e–5
3
8.88e–6
0.24
–
–
distance between bolt and inner edge of segment
6.76e–5
3
2.25e–5
0.62
–
–
joint gap
2.22e–3
3
7.41e–4
20.33
F0.05
**
error
1.09e–4
3
3.64e–5
–
–
–
sum
2.64e–3
15
–
–
–
–
Tab.5
Fig.6
Fig.7
Fig.8
Fig.9
Fig.10
Fig.11
Fig.12
Fig.13
parameter
size (mm)
H
300
600
39
50
25
110
4
Tab.6
Fig.14
Fig.15
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