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Load-bearing Behavior and Reinforcement Schemes of High-performance
Fiber-reinforced Concrete Jacking Pipes under Three-point Loading
(1. PowerChina Hubei Electric Engineering Co., Ltd., Wuhan 430040; 2. China Electric Power Research Institute Co., Ltd.,
Beijing 102401; 3. Economic and Technological Research Institute, State Grid Hubei Electric Power Co., Ltd., Wuhan 430077;
4. School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114;
5. Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province, Changsha 410114)
Abstract High-performance fiber-reinforced concrete (HPFRC) exhibits significant potential for use in electricpower pipe-jacking engineering due to its superior strength, ductility, and durability. However, research on the mechanical properties of HPFRC jacking pipes remains scarce. This study investigates the load-bearing characteristics of C150 HPFRC jacking pipes under three-point loading and evaluates the influence of different reinforcement schemes through model tests, analytical calculations, and numerical simulations. The results indicate that the loaddisplacement relationship of HPFRC jacking pipes initially follows a linear elastic trend. When the load exceeds200 kN/m, the displacement accelerates, and cracks develop in the pipe segment. Structural failure occurs at a peak load of 437 kN/m. Compared to conventional concrete jacking pipes, HPFRC pipes demonstrate significantly improved load-bearing capacity, crack resistance, and post-damage residual strength while requiring less steel reinforcement and reduced wall thickness. The three analytical methods yield consistent results regarding structural stress behavior and failure progression. However, the analytical calculation method exhibits notable errors in predicting crack widths. Furthermore, different reinforcement schemes significantly influence structural damage and load capacity, with double-sided and inner-layer reinforcement configurations demonstrating superior damage resistance.
Abstract：
High-performance fiber-reinforced concrete (HPFRC) exhibits significant potential for use in electricpower pipe-jacking engineering due to its superior strength, ductility, and durability. However, research on the mechanical properties of HPFRC jacking pipes remains scarce. This study investigates the load-bearing characteristics of C150 HPFRC jacking pipes under three-point loading and evaluates the influence of different reinforcement schemes through model tests, analytical calculations, and numerical simulations. The results indicate that the loaddisplacement relationship of HPFRC jacking pipes initially follows a linear elastic trend. When the load exceeds200 kN/m, the displacement accelerates, and cracks develop in the pipe segment. Structural failure occurs at a peak load of 437 kN/m. Compared to conventional concrete jacking pipes, HPFRC pipes demonstrate significantly improved load-bearing capacity, crack resistance, and post-damage residual strength while requiring less steel reinforcement and reduced wall thickness. The three analytical methods yield consistent results regarding structural stress behavior and failure progression. However, the analytical calculation method exhibits notable errors in predicting crack widths. Furthermore, different reinforcement schemes significantly influence structural damage and load capacity, with double-sided and inner-layer reinforcement configurations demonstrating superior damage resistance.
ZHOU Cairong1 YI Liming1 MA Shanqing2 ZHOU Li3 YU Jinhong4,
5
.Load-bearing Behavior and Reinforcement Schemes of High-performance
Fiber-reinforced Concrete Jacking Pipes under Three-point Loading[J] MODERN TUNNELLING TECHNOLOGY, 2025,V62(4): 50-60
2025, Vol. 62 