Determining the Cause of Damages in a Multiarch Tunnel Structure through Field Investigation and Numerical Analysis

Zhang, Yongxing; Shi, Yufeng; Zhao, Yiding; Fu, Lirong; Yang, Junsheng

doi:10.1061/(asce)cf.1943-5509.0000981

Cited by 29 publications

(5 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The surrounding rocks are considered as ideal elastic-plastic material met with Mohr-Coulomb yield criterion, which can also reflect the behavior of surrounding rocks during tunneling. Moreover, the effect of reinforcement ribs in single-layer lining is consider by using the principle of equivalent stiffness, in which the elastic modulus of reinforcement ribs is converted to that of shotcrete by the following calculation formula [27]: In the numerical model, the excavation span of the tunnel section is 12.2 m, and the buried depth of the tunnel is 50 m. The stratum in the model is divided into three layers starting from the ground surface and similar with that observed in field, in which the full weathering layer has 10 m thickness, strong weathering layer has 15 m thickness, and the below one is limestone layers. The construction method with upper and lower benches is employed for tunnel excavation, and the single-layer lining is added after tunnel excavation.…”

Section: Numerical Models and Materials Propertiesmentioning

confidence: 99%

Section: Numerical Models and Materials Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Performance of Single-Layer Lining Using Shotcrete and Reinforcement Ribs Employed for Supporting Large-Span Tunnel

Li,

Diao,

et al. 2023

Materials

Self Cite

View full text Add to dashboard Cite

Single-layer tunnel lining using shotcrete has the significant advantages of reducing the tunnel excavation volume and saving construction materials, which has been gradually applied in tunnel construction. The high-performance concretes are generally adopted in single-layer tunnel lining for enhancing the bearing capacity of the tunnel lining, whereas the single-layer tunnel lining may still induce damages due to the adverse conditions such as shallow buried depth of the tunnel, and further study related to its application condition is thus required. This paper presents a study of the single-layer tunnel lining with shotcrete employed for supporting the large-span tunnel, in which the reinforcement ribs are also adopted in the single-layer lining for improving the lining stiffness and strength. The study is implemented using numerical simulation, focusing on the safety and performance variation of the single-layer tunnel lining influenced from the varied lining thicknesses and shallow buried depths of the tunnel. The results shows that the single-layer tunnel lining has the obvious advantage of toughness in significantly absorbing large deformation of surrounding rocks and improving the ability to resist lining cracking. The results also demonstrate that the single-layer tunnel lining with shotcrete and reinforcement ribs can safely support the large-span tunnel, in which the stability and safety of the large-span tunnel are confirmed from both the tunnel deformation and lining stresses. Moreover, the factors related to both the lining thickness and shallow buried depth of the tunnel have great influence on the single-layer tunnel lining with shotcrete and reinforcement ribs, in which the insufficient lining thickness and excessive shallow buried depth of the tunnel can induce the damages of the single-layer tunnel lining due to shotcrete stresses exceeding its strength. This study provides some references of employing the single-layer tunnel lining with shotcrete and reinforcement ribs for supporting large-span tunnel.

show abstract

Section: Numerical Models and Materials Propertiesmentioning

confidence: 99%

Section: Numerical Models and Materials Propertiesmentioning

confidence: 99%

Performance of Single-Layer Lining Using Shotcrete and Reinforcement Ribs Employed for Supporting Large-Span Tunnel

Li,

Diao,

et al. 2023

Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…(2020) analyzed the causing mechanism of the distresses during a shallow and asymmetrically loaded tunnel portal construction, it was found that the asymmetrical loading, the precipitation and the inadequate construction management were the main reasons of failure event. With the nite element simulation, Zhang et al (2017) investigated the cracking causes of secondary lining concrete at vault of multiarch tunnel. The results indicated that the shallow buried and bias on topography and the use of plain concrete led to the concrete cracking due to excessive tensile stress and negative bending moment.…”

Section: Introductionmentioning

confidence: 99%

Failure mechanism and treatment measures of supporting structures at the portal for a shallow buried and asymmetrically loaded tunnel with small clear-distance

et al. 2022

View full text Add to dashboard Cite

The construction of tunnel portal not only has to face the challenges of complex geological conditions such as shallow buried and asymmetrically loaded, but also needs to consider the adverse effects of factors such as the layout form of the tunnel. Thus, the construction of portal has always been the di culty and focus of tunnel engineering construction. Under the coupling of multiple adverse factors such as complex geological conditions and special layout form, the tunnel portal is prone to excessive deformation, supporting structures cracking and even collapse during the excavation. In this study, a shallow buried and asymmetrically loaded tunnel with small clear-distance in northwest China was taken as an engineering case. Aiming at the distresses of slope instability, peeling off and block falling of primary support concrete and cracking of secondary lining concrete in the tunnel portal construction, combined with eld investigation, statistical analysis, numerical simulation and deformation monitoring, the failure mechanism of supporting structures was deeply studied, and the corresponding treatment measures were proposed. The research results indicated that the loose and broken gravel soil in the shallow buried section, asymmetrical loading, surface water in ltration, and short construction spacing between two tunnels were the main triggers of supporting structures failure. Affected by the topographic bias, the loose load generated by the surrounding rock on the deep buried side squeezed the entire tunnel to the shallow buried side after the portal excavation. And this deformation trend became more signi cant after the gravel soil was deteriorated by water immersion. The retaining wall produced a clockwise rotation deformation around the wall corner in the process of limiting the tunnel deviation, and the local wall body cracked due to the excessive tensile stress. The primary support concrete and secondary lining concrete produced excessive asymmetrical deformation because of the signi cant asymmetrical loading. The concrete with excessive deformation was cracked by obvious tensile or shear stress. The following tunnel excavation had a signi cant negative impact on the stability of the prior tunnel. Combining the failure mechanism of the supporting structures and the characteristics of the continuous development of cracks, the treatment measures of 'stabilize the stratum rst and then treat the cracks' were proposed, including the back lling and tamping the shallow buried side at tunnel portal, reinforcing the interlaid rock by ground surface grouting, setting intercepting ditch at the slope top, staggering a certain safe excavation distance between the following tunnel and the prior tunnel. The eld monitoring and patrol inspection results indicated that the proposed treatment measures had achieved the expected results. The research results can provide corresponding construction experience and suggestions for similar projects in the future.

show abstract

“…Among the methods used, fiber optic sensors have gained increasing attention. Fiber optic sensors have been widely applied in many fields, such as airplanes/spacecraft [2], piles [3,4], civil infrastructure [5,6], submarines and deep-sea floor [7,8], health care [9], etc. After decades of development, two types of optical fiber sensing technology have been utilized or even improved upon in lab experiments and actual civil engineering, as follows: Fiber Bragg grating (FBG) and Brillouin scattering based optical sensors.…”

Section: Introductionmentioning

confidence: 99%

Sensing Properties of Fused Silica Single-Mode Optical Fibers Based on PPP-BOTDA in High-Temperature Fields

Shen

Zhu

et al. 2019

Sensors

View full text Add to dashboard Cite

The strain of fiber-reinforced polymer (FRP) bars at high temperatures is currently difficult to measure. To overcome this difficulty, a method of smart FRP bars embedded with optical fibers was proposed and studied, in which an ordinary single-mode optical fiber was applied as a distributed sensor. In this paper, both the distributed temperature and strain-sensing characteristics of optical fiber were studied based on pulse pre-pump Brillouin optical time-domain analysis (PPP-BOTDA) under high temperature. The temperature and strain coefficients were investigated under a thermomechanical coupling environment with consideration of large strain levels. The experimental results show that the temperature and strain coefficients decreased as the temperature increased, because the properties of silica and coating materials changed with temperature. Then, the formulas for determining the temperature and strain coefficients at high temperatures were introduced and discussed. The excellent sensing performance of the optical fiber indicated that smart FRP bars have the potential for use at high temperatures.

show abstract

Determining the Cause of Damages in a Multiarch Tunnel Structure through Field Investigation and Numerical Analysis

Cited by 29 publications

References 7 publications

Performance of Single-Layer Lining Using Shotcrete and Reinforcement Ribs Employed for Supporting Large-Span Tunnel

Performance of Single-Layer Lining Using Shotcrete and Reinforcement Ribs Employed for Supporting Large-Span Tunnel

Failure mechanism and treatment measures of supporting structures at the portal for a shallow buried and asymmetrically loaded tunnel with small clear-distance

Sensing Properties of Fused Silica Single-Mode Optical Fibers Based on PPP-BOTDA in High-Temperature Fields

Contact Info

Product

Resources

About