Large-scale model test study on the water pressure resistance of construction joints of karst tunnel linings
Meng HUANG1, Mingli HUANG1(), Ze YANG2, Yuan SONG3, Zhien ZHANG1
1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China 2. Enterprise Key Laboratory, Tianjin Municipal Engineering Design and Research Institute, Tianjin 300392, China 3. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China
Model tests and numerical calculations were adopted based on the New Yuanliangshan tunnel project to investigate the water pressure resistance of lining construction joints in high-pressure and water-rich karst tunnels. A large-scale model test was designed and conducted, innovatively transforming the external water pressure of the lining construction joint into internal water pressure. The effects of the embedded position and waterstop type on the water pressure resistance of the construction joint were analyzed, and the reliability of the model test was verified via numerical calculations. The results show that using waterstops can significantly improve the water pressure resistance of lining construction joints. The water pressure resistance of the lining construction joint is positively correlated with the lining thickness and embedded depth of the waterstop. In addition, the type of waterstop significantly influences the water pressure resistance of lining construction joints. The test results show that the water pressure resistance of the embedded transverse reinforced waterstop is similar to that of the steel plate waterstop, and both have more advantages than the rubber waterstop. The water pressure resistance of the construction joint determined via numerical calculations is similar to the model test results, indicating that the model test results have high accuracy and reliability. This study provides a reference for similar projects and has wide applications.
. [J]. Frontiers of Structural and Civil Engineering, 2023, 17(8): 1249-1263.
Meng HUANG, Mingli HUANG, Ze YANG, Yuan SONG, Zhien ZHANG. Large-scale model test study on the water pressure resistance of construction joints of karst tunnel linings. Front. Struct. Civ. Eng., 2023, 17(8): 1249-1263.
The penetration distance of seepage point #1 is increased.
5
2.5
30
The distance of seepage point #1 is increased, and seepage point #2 appears.
6
3.0
30
The seepage distances of seepage points #1 and #2 increase.
7
3.5
30
Seepage point #2 accelerates seepage, and distance of seepage point #1 increases.
8
4.0
30
Seepage points #1 and #2 are about to be penetrated.
9
4.5
30
Seepage points #1 and #2 have been penetrated.
10
5.0
30
When the pressure is increased to 5.0 MPa, there is no phenomenon that the seepage velocity of the crack is accelerated, and the leakage is stable.
Tab.6
Fig.17
Fig.18
Fig.19
specimen number
type and buried depth of waterstop (cm)
pressure of model test (MPa)
1
steel plate waterstop (30)
1.5
2
no waterstop (60)
1.0
3
rubber waterstop (60)
2.1
4
steel plate waterstop (60)
4.0
5
steel plate waterstop (80)
> 6.0
6
transverse reinforced waterstop (30)
1.5
Tab.7
working condition
numerical calculation results
large-scale model test results
no waterstop
1.0
1.0
buried depth of waterstop: 30 cm
1.4
1.5
Tab.8
Fig.20
Fig.21
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