Performance assessment of diseased tunnels based on FRP-PCM reinforcement

doi:10.16265/j.cnki.issn1003-3033.2025.05.1523

Abstract

Abstract:

In order to enhance the safety and operational maintenance capabilities of tunnels, a quantitative evaluation framework and design methodology for FRP-PCM composite reinforcement in diseased tunnels was established through cross-sectional ultimate bearing capacity analysis. Numerical tests were conducted using the finite difference method to analyze the stability of FRP-PCM-reinforced diseased tunnels. Tunnel safety assessment was performed based on the sectional ultimate bearing capacity curve, commonly referred to as the M-N curve. A safety factor α of the M-N curve was proposed to enable a quantitative evaluation of the reinforcement effect. Based on this framework, a design and selection scheme for FRP was established, incorporating tunnel design specifications. The analysis reveals that when cavities exist at the crown of the tunnel, both the crown and shoulders exhibit higher risk levels according to the M-N curve. Furthermore, under conditions of poorer surrounding rock quality, greater lining concrete deterioration, and increased loosening pressure height, the reinforcing effect of the FRP-PCM method becomes more significant. For cases with an 80% degradation degree, Class V surrounding rock, and a loosened pressure height of 2D, the application of different types of FRP reinforcement reduces the safety factor of the M-N curve by 23%-32%, thereby significantly improving the structural safety of the lining. By leveraging the M-N curve's safety coefficient, an appropriate FRP type can be selected for defective lining reinforcement based on factors such as rock quality, loose pressure height, and lining conditions.

Key words: diseased tunnel, fiber-reinforced polymer cement mortar (FRP-PCM), reinforcement, M-N curve, lining diseases

CLC Number:

X913.4安全系统工程

XU Zhenyu, ZHANG Xuepeng, LI Ningbo, JIANG Yujing, CHEN Hongbin, LIU Linsheng. Performance assessment of diseased tunnels based on FRP-PCM reinforcement[J]. China Safety Science Journal, 2025, 35(5): 186-194.

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项目		密度 ρ/(kg·m^-3)	E₀/GPa	ν	φ/(°)	黏聚力 c/MPa	σ_c/MPa	σ_t/MPa
围岩等级	III级	2 400	13.500	0.275	44.5	1.10	3.28	0.33
	IV级	2 150	4.000	0.325	33	0.45	1.22	0.12
	V级	1 900	1.500	0.400	23.5	0.16	0.39	0.04
衬砌		2 400	24.500	0.200	40	6.99	30.00	2.00
空洞填充材料		980	0.012	0.130	10	0.50	1.09	0.20

劣化状态/%	E₀/GPa	ν	φ/(°)	c/MPa	σ_t/MPa
0	24.5	0.2	40	6.99	3
33	16.3	0.2		4.66	2
80	4.9	0.2		1.40	0.6

材料	E₀/ GPa	σ_t/ MPa	黏聚力c/ MPa	φ/ (°)	刚度系数k_s/ (MPa·mm^-1)	厚度/ mm
CR4	100	1 400	2.217	40	5.298	2
CR6		4.6			6.394	4
CR8					13.369	5
PCM	26				—	10

设计因素	工况值
衬砌空洞	含空洞、不含空洞模型
混凝土劣化程度/%	0、33、80
松动压力/m	3、6、9.6 (1D)、19.2 (2D)
围岩等级	III、IV、V
FRP型号	无补强、CR4、CR6、CR8