Dynamic Damage Characteristics of Large Section Tunnel Lining Under Seismic Load

doi:10.12141/j.issn.1000-565X.220391

Abstract

Abstract:

Based on the dynamic damage characteristics of concrete material, this paper established an elastoplastic damage constitutive model, which was applied to a tunnel project with large section in a strong earthquake area. It analyzed the seismic response and dynamic damage law of tunnel structure under different incident directions of seismic waves, seismic wave intensity and surrounding rock conditions, and discussed the seismic damage characteristics and failure mechanism of large section tunnel structure. The results show that the principal stress and acceleration responses of the lining are similar under vertical and horizontal incidence conditions, but the stress and acceleration responses of the lining structure under horizontal incidence conditions are more intense than that under vertical incidence conditions. The dynamic damage of the lining at horizontal incidence is much greater than that at vertical incidence, and the dynamic damage is mainly concentrated at the arch waist and the foot of the wall. The surrounding rock conditions have significant influence on the tensile principal stress response and dynamic damage of the tunnel lining structure. The maximum tensile stress of the lining structure under V-level surrounding rock is 5.7 times of that under IV level surrounding rock. The seismic response and dynamic damage characteristics of tunnel structure are also affected by the intensity of seismic waves. With the increase of seismic wave intensity, the peak value of stress, acceleration response and the maximum amount of dynamic damage show a nonlinear increase trend, and the dynamic damage intensifies and gradually expands outward from the waist and the foot of the wall. In the seismic design of soft rock tunnel in strong earthquake area and the post-earthquake reinforcement and repair during operation, attention should be paid to the parts where the dynamic damage is concentrated.

Key words: large section tunnel, lining structure, elastoplastic damage constitutive model, seismic response, dynamic damage characteristic

CLC Number:

HUANG Juan, LONG Haofeng, ZHOU Shijie, et al. Dynamic Damage Characteristics of Large Section Tunnel Lining Under Seismic Load[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(4): 124-134.

Figures/Tables 20

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Fig.7

Table 1

Table 2

Table 3

Parameters of concrete damage constitutive models"

结构名称	A_t	B_t	ε $f t$	A_c	B_c	ε $f c$
二次衬砌（C35）	0.83	5×10⁴	1.1×10^-4	1.3	1×10³	1.26×10^-3

Table 3

Fig.8

Fig.9

Fig.10

Table 4

Fig.11

Table 5

Fig.12

Fig.13

Fig.14

Fig. 15

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围岩条件	γ/（kN·m^-3）	E/MPa	μ	c/kPa	φ/（°）
Ⅳ	22	600	0.35	100	30
Ⅴ	19.5	200	0.35	50	25

入射条件	最大损伤量
入射条件	拱顶	拱腰	墙中	墙脚	仰拱
水平入射	0.002	0.637	0.006	0.847	0.002
垂直入射	0.000 7	0.001 1	0.003 2	0.000 7	0.000 5

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