Abstract
Cracks in the lining significantly reduce the safety of a tunnel during operation. It is urgent to figure out the influence of cracks on tunnel carrying capacity. In this paper, three-dimensional model tests were conducted to investigate deformation, internal force, and deterioration laws of the lining with prefabricated cracks at different positions. The main conclusions were obtained as follows: (1) The carrying capacity of the lining structure with prefabricated cracks was reduced, and the deformation of the lining structure increased. The penetration of the vault crown crack accelerated the damage of the lining structure, and structural failure occurred when the crack went through at the left arch spring. (2) The internal force of the lining was greatly affected by the positions of prefabricated cracks. The internal forces of the lining structure decreased with the existence of prefabricated cracks. Whether or not there were prefabricated cracks, tension cracks appeared in the inside fiber of the vault and inverted arch. (3) The deformation of the lining structure with the existence of prefabricated cracks increased. When the prefabricated crack was located at the vault, the deformation was the largest, followed by the arch spring, side wall, and arch shoulder. (4) The analysis shows that prefabricated cracks at the vault are the most damaging under stress and deformation of the lining structure, so longitudinal cracks at the vault should be strengthened.
Highlights
In recent years, the safety of tunnel construction, especially the stability of the tunnel face [1,2,3,4]and the deformation of the ground and neighboring structures [5,6], has been a research hotspot in the field of tunnel engineering
When the prefabricated crack was located at the vault, the deformation was the largest, followed by the arch spring, side wall, and arch shoulder
(4) The analysis shows that prefabricated cracks at the vault are the most damaging under stress and deformation of the lining structure, so longitudinal cracks at the vault should be strengthened
Summary
The safety of tunnel construction, especially the stability of the tunnel face [1,2,3,4]. Based on model tests and numerical calculations, the influence of tunnel excavation on existing cracks in the surrounding rock was studied, and the crack propagation law and structural damage mode of surrounding rock were obtained [12]. Zhang [18] first put forward the concept of the degree of health of the tunnel structure, and established a quantitative method to evaluate the safety status of the tunnel structure based on data of an engineering inspection He [19] designed a 1:25 model test of the Bijiashan tunnel and studied the influence of backfilling and grouting, inner surface reinforcement of the lining, combined reinforcement, and the stress field on the carrying capacity of tunnel structures with cracks. The internal force, deformation, and progressive failure law of the lining are analyzed to reveal the impact of lining cracks on the carrying capacity of the lining to provide a reference for the treatment of lining cracks in similar subway projects
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