Mechanisms of large deformation in soft rock tunnels: a case study of Huangjiazhai Tunnel

Bian, Kang; Liu, Jian; Liu, Zhenping; Liu, Shangge; Ai, Fei; Zheng, Xiaoming; Ni, Shaohu; Zhang, Wei

doi:10.1007/s10064-017-1155-8

Cited by 78 publications

(16 citation statements)

References 40 publications

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“…Stability is one of most important things in the construction of tunnels and other underground projects (Bian et al, 2017;Wang et al, 2021;Zhao et al, 2021). Affected by the complex geological conditions, the stability of surrounding rock mass may be different at different areas.…”

Section: Introductionmentioning

confidence: 99%

Research on the Stability of Shallow-Buried Large Cross-Section Tunnel by Construction Method Conversion

Zhang¹,

Zhao

Peng³

et al. 2022

Front. Earth Sci.

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The blind and random use of the combined construction method may have a great impact on tunnel stability. To determine the influence of construction method conversion on tunnel deformation and the reasonable conversion condition, a numerical model is established to simulate the construction method transforms from central diaphragm method to the benching tunneling method based on Jiaoweiqin Tunnel. The conversion condition is determined based on the results of tunnel geological prediction and in-site monitoring, and the temporary two-bench tunneling method is adopted to ensure the success of construction method conversion. Besides, the parameter analysis is done to analyze the influence of mechanical properties of surrounding rock mass and bench length on tunnel stability. Research results indicate that the construction safety should be evaluated before construction method conversion is carried out by analyzing the design blueprint, tunnel geological prediction results, geological survey reports, rock mass conditions in front of tunnel face, in-site monitoring data, and numerical simulation results. Meanwhile, the construction method conversion can be carried out in the order of central diaphragm method, two-bench tunneling method, and bench tunneling method. Parameter analysis results reveal that the deformation of primary support decreases in a negative exponential form with the increase in elasticity modulus and increases approximately linearly with the increase in bench length. For shallow buried and large cross-section tunnels, the tunnel deformation is in a small state when the elastic modulus of rock mass reaches a certain value. The construction method conversion can be carried out when the rock mass has a certain stability, and the length of construction method conversion should be small to ensure construction safety.

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Section: Introductionmentioning

confidence: 99%

Research on the Stability of Shallow-Buried Large Cross-Section Tunnel by Construction Method Conversion

Zhang¹,

Zhao

Peng³

et al. 2022

Front. Earth Sci.

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“…Sun et al [11] studied the softening characteristics and failure mode of rock under different immersion time and analyzed the failure mode of tunnel under different water contents. Bian et al [12] considered the shale of Huangjialing tunnel as the research object, studied the changes in mineral composition and microstructure under different immersion time, analyzed the failure modes under different immersion time, and predicted the failure modes of the tunnel under different water contents.…”

Section: Introductionmentioning

confidence: 99%

Application of Modified Hoek–Brown Strength Criterion in Water-Rich Soft Rock Tunnel

Deng

Wang

et al. 2021

Geofluids

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When a tunnel is excavated in the water-rich soft rock stratum, the strength of the soft rock is greatly reduced due to the seepage of groundwater. The condition may result in engineering accidents, such as large deformation, limit invasion, and even local collapse of the tunnel. Therefore, it is very important to research the stability of the surrounding rock in the water-rich soft rock tunnel. The water-rich disturbance factor considering the seepage influence of groundwater and blasting disturbance is proposed, and the generalized Hoek–Brown strength criterion is modified on the basis of the immersion softening test of soft rock. In accordance with the classical elastic–plastic mechanics theory, the stress, strain, and displacement calculation formulas of the tunnel surrounding rock are derived. The displacement of tunnel surrounding rock is analyzed using the derived formula and the modified Hoek–Brown strength criterion and then compared with the measured value. Results show that the displacement of surrounding rock, which is calculated by modified Hoek–Brown strength criterion considering water-rich disturbance factor and the displacement calculation formula, is close to the measured deformation of surrounding rock in water-rich soft rock tunnel, and the error is small. Therefore, the modified Hoek–Brown strength criterion can be applied to the water-rich soft rock tunnel, and the derived displacement calculation formula can accurately calculate the deformation of tunnel surrounding rock. It is of great significance to the study of surrounding rock stability of water-rich soft rock tunnel.

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“…Composite lining structure is the most common form of support in present-day tunnel engineering. Without feasible designing parameters for the secondary lining [2,3], weak strata that have already shown conspicuous creep characteristics will eventually fail due to the excessive deformation pressure [4][5][6][7][8]. As shown in Figure 1, common forms of failed designs include tunnel roof subsidence, tunnel lining destruction, tunnel lateral wall destruction, and the destruction of tunnel support steel arch.…”

Section: Introductionmentioning

confidence: 99%

Stress‐Strain Calculation Method of Composite Lining considering the Creep Characteristics of Tunnel Surrounding Rock

Huang

2021

Advances in Civil Engineering

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Tunnels are generally designed for a sustained usage of 80 to 100 years, during which the safety of tunnel structures must be guaranteed. A common supporting form utilized in contemporary tunnel engineering is composite lining. To derive applicable parameters of the supporting form and therefore ensure the long-term safety of the tunnel structure, it is imperative to determine the extra acting force exerted onto the composite lining by the creep of the rock surrounding the tunnel and to calculate the stress-strain characteristics of composite lining. In the current study, this paper proposes an approach termed surrounding reinforcement, which is based on the homogenization method. Specifically, this paper defined the bolt force as the internal force of the surrounding rock, analyzed their viscoelastic-plastic properties using the unified strength theory, and derived an equation for calculating the stress-strain relationship of the composite lining. To further validate the method in tunnel structures, this paper applied the derived equation to a representative instance. The results of this paper show that the initial support force has also increased during the creep process of the surrounding rock, indicating that engineers should pay close attention to the coordination between the strength of initial support and the secondary lining and thus ensure an optimal distribution of the pressure from the surrounding rock when designing composite lining tunnel within weak strata. This paper proposes that the initial support not only would guarantee the tunnel safety during the construction stage but also could cooperate with the secondary lining to brace the stress caused by the creep, ensuring that the supporting structure stays stable across the whole period of tunnel operation. This paper provides an alternative to previous methods that is more comprehensive, with simpler calculations, and more applicable to the composite lining supporting design within weak strata.

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Mechanisms of large deformation in soft rock tunnels: a case study of Huangjiazhai Tunnel

Cited by 78 publications

References 40 publications

Research on the Stability of Shallow-Buried Large Cross-Section Tunnel by Construction Method Conversion

Research on the Stability of Shallow-Buried Large Cross-Section Tunnel by Construction Method Conversion

Application of Modified Hoek–Brown Strength Criterion in Water-Rich Soft Rock Tunnel

Stress‐Strain Calculation Method of Composite Lining considering the Creep Characteristics of Tunnel Surrounding Rock

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