Numerical study of the mechanical process of long-distance replacement of the definitive lining in severely damaged highway tunnels

Liu, Xinrong; Zhuang, Yang; Zhou, Xiaohan; Li, Chao; Lin, BinBin; Liang, Ninghui; Zhong, Zuliang; Deng, Zhiyun

doi:10.1016/j.undsp.2022.07.007

Cited by 8 publications

(5 citation statements)

References 33 publications

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“…Shallower tunnels are more likely to undergo deformation when subjected to seismic waves than deeper tunnels [10][11][12][13][14][15][16][17][18][19][20]. Scholars have carried out numerical and experimental investigations into the seismic activity of various components of underground structures.…”

Section: Introductionmentioning

confidence: 99%

Seismic Isolation Materials for Bored Rock Tunnels: A Parametric Analysis

Elgamal,

Elfaris

2024

Infrastructures

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Most recent tunnel designs rely on more thorough analyses of the intricate rock interactions. The three principal techniques for excavating rock tunneling are drill-and-blast for complete or partial cross-sections, TBM only for circular cross-sections with full faces, and road header for small portions. Tunnel-boring machines (TBM) are being utilized to excavate an increasing number of tunnels. Newer studies have demonstrated that subterranean structures such as tunnels produce a variety of consequences during and after ground shaking, challenging the long-held belief that they are among the most earthquake-resistant structures. Consequently, engineering assessment has become crucial for these unique structures from both the geotechnical and structural engineering standpoints. The designer should evaluate the underground structure’s safety to ensure it can sustain various applied loads, considering both seismic loads and temporary and permanent static loads. This paper investigates how adding elastic, soft material between a circular tunnel and the surrounding rock affects seismic response. To conduct the study, Midas/GTS-NX was used to model the TBM tunnel and the nearby rock using the finite element (F.E.) method to simulate the soil–tunnel interactions. A time–history analysis of the El Centro (1940) earthquake was used to calculated the stresses accumulated in the tunnels during seismic episodes. Peak ground accelerations of 0.10–0.30 g, relative to the tunnel axis, were used for excitation. The analysis utilized a time step of 0.02 s, and the duration of the seismic event was set at 10 s. Numerical models were developed to represent tunnels passing through rock, with the traditional grout pea gravel vs. isolation layer. A parametric study determined how isolation material characteristics like shear modulus, Poisson’s ratio, and unit weight affect tunnel-induced stresses. In the meantime, this paper details the effects of various seismic isolation materials, such as geofoam, foam concrete, and silicon-based isolation material, to improve protection against seismic shaking. The analysis’s findings are discussed, and how seismic isolation affects these important structures’ performance and safety requirements is explained.

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Section: Introductionmentioning

confidence: 99%

Seismic Isolation Materials for Bored Rock Tunnels: A Parametric Analysis

Elgamal,

Elfaris

2024

Infrastructures

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“…Qi et al (2005) introduced the phenomenon of salt crystallization and cracking on the lining surface of the Jinjiguan Tunnel. Liu et al (2023) conducted a damage survey on a highway tunnel in Chongqing that was severely corroded by sulfate and found that the strength of the corroded lining was lower than the designed value. However, the relevant reports were mainly focused on a simple description of the service environment of a tunnel and its damage phenomenon, but there is a lack of systematic and comprehensive analysis and summary of the corrosion environment and typical damage characteristics of this type of sulfate-corroded tunnel.…”

Section: Introductionmentioning

confidence: 99%

Study of the damage characteristics and corrosion mechanism of tunnel lining in a sulfate environment

Liu,

Zhuang,

Zhou

et al. 2024

Front. Mater.

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Sulfate corrosion is one of the main causes of tunnel lining deterioration. An accurate understanding of the damage characteristics and corrosion mechanism of sulfate-corroded tunnels is the basis for the anti-corrosion design and damage control of the tunnel lining. Based on a project concerning a sulfate-corroded tunnel in the mountainous area of Southwest China, this study conducted a field investigation and laboratory tests and, combined with existing research data, summarized the damage characteristics and corrosion mechanism of this type of tunnel and proposed the characteristic corrosion state of tunnel lining in a sulfate environment. The results show that 1) sulfate corrosion led to leakage, surface spalling crystallization, and strength loss, and the corrosion typically occurred at the arch waist and arch foot. 2) Physical and chemical corrosion occurred in the tunnel lining, and the corrosion products included sodium sulfate, calcium carbonate, gypsum, ettringite, and thaumasite. 3) In China, this type of tunnel is mainly located in the Southwest and Northwest, and its lining is in a special state of “one-sided accelerated corrosion.”

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“…This kind of research can directly reflect the internal structure state of the sample and reveal the evolution and development process of defects, but it is difficult to directly quantify the performance changes in concrete damage only based on image data. Combined with CT scanning image and ultrasonic velocity measurements, a CT image is used to extract the technical advantages of its internal junction characteristics [ 27 ], and more accurate ultrasonic velocity change data can be obtained by eliminating stable components, such as coarse aggregate [ 28 ], to realize the refined analysis of ultrasonic velocity on the concrete damage process [ 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…Non-destructive testing techniques, such as ultrasonic velocity measurement and X-CT, have played an important role in analyzing the properties of cement mortar and concrete subjected to sulfate attack under indoor conditions. It is worth noting that diseases in real engineering are often more complex and inhomogeneous than in laboratory experiments [ 28 , 29 ]. The inhomogeneity of this disease was also observed in sulfate attack experiments on concrete samples extracted from service structures [ 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Compartmentalized Quantitative Analysis of Concrete Sulfate-Damaged Area Based on Ultrasonic Velocity

et al. 2023

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The corrosion of concrete in sulfate environments is a difficult problem in the durability of civil engineering structures. To investigate the variability of deterioration damage to concrete structures by sulfate erosion under non-destructive testing and quantify the protective effect of silane coatings on concrete under the action of sulfate erosion, an accelerated erosion experiment was carried out using field sampling in a tunnel project under a sulfate erosion environment. By means of ultrasonic velocity measurement and CT scanning, the samples protected by a silane coating under the sulfate attack environment were compared with those not protected. The deterioration characteristics of concrete under the sulfate attack environment and the protective effect of silane coating on the concrete structure were analyzed. In addition, a method for evaluating the sulfate damage to concrete based on CT images and ultrasonic velocity analysis was proposed. The results show that the samples prepared in the field show a significant difference in ultrasonic velocity in the process of erosion and deterioration according to the material difference at the measuring point interface. Through the overall damage evaluation analysis of the sample, it is concluded that the damage degree of the protected group sample is light and the heterogeneity is weak, whereas the local damage to the exposed group is serious. Combined with the CT image analysis of concrete before and after loading, the distribution characteristics of the damaged area divided by the concrete sulfate damage evaluation method proposed in this paper are highly similar to the real situation. The results of the study can provide a reference for similar projects for the detection, analysis, protection and evaluation of sulfate-attacked concrete.

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Numerical study of the mechanical process of long-distance replacement of the definitive lining in severely damaged highway tunnels

Cited by 8 publications

References 33 publications

Seismic Isolation Materials for Bored Rock Tunnels: A Parametric Analysis

Seismic Isolation Materials for Bored Rock Tunnels: A Parametric Analysis

Study of the damage characteristics and corrosion mechanism of tunnel lining in a sulfate environment

Compartmentalized Quantitative Analysis of Concrete Sulfate-Damaged Area Based on Ultrasonic Velocity

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