A Study on the Formation Mechanism and Calculation Method of Surrounding Rock Pressure in Shallow-buried Loess Tunnel Considering the Influence of Vertical Joints

Zhao, Mingkun; Lai, Hongpeng; Liu, Yuyang

doi:10.1007/s12205-023-1479-9

Cited by 8 publications

(4 citation statements)

References 57 publications

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“…Select ZK10+745-ZK10+705 of the tunnel for numerical simulation. According to Saint-Venant's principle, the dimensions of the numerical model should be at least three times the diameter of the excavated tunnel in order to eliminate boundary effects [22].…”

Section: Model and Parametersmentioning

confidence: 99%

“…to Saint-Venant's principle, the dimensions of the numerical model should be at least three times the diameter of the excavated tunnel in order to eliminate boundary effects [22]. Consequently, the width, length and height of the numerical model were 120, 40 and 80 m. The thickness of the surrounding rock above the tunnel is 15.9 m, based on the average burial depth.…”

Section: Model and Parametersmentioning

confidence: 99%

See 1 more Smart Citation

Mechanical Response and Stability Optimization of Shallow-Buried Tunnel Excavation Method Conversion Process Based on Numerical Investigation

Pan,

Zhou,

Jiang

2024

Buildings

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Different excavation methods lead to substantial changes in the relaxation zone of the surrounding rock. The stress characteristics of the support structure become more complex during the process of excavation method conversion. It is essential to design a well-considered construction plan to minimize the disruptions caused by excavation method conversion. This work takes a tunnel in Jiangsu Province, China, as the engineering background and establishes a numerical model for the conversion from the double-side-drift method to the three-bench method. Based on a numerical investigation, this study analyzed the deformation of surrounding rock and the stress state of the support structure during the excavation method conversion. The results showed that excavation method conversion can accelerate the deformation rate of the surrounding rock, causing the support structure to bear greater pressure. This leads to a significant increase in the circumferential stress at the junction of two excavation methods. Setting up a reinforced area during the process of excavation method conversion can improve the stress state of the support structure. Finally, an analysis of the parameters of the reinforced area was conducted, and a reasonable construction plan was proposed. This study can provide guidance for subsequent construction projects.

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Section: Model and Parametersmentioning

confidence: 99%

Section: Model and Parametersmentioning

confidence: 99%

Mechanical Response and Stability Optimization of Shallow-Buried Tunnel Excavation Method Conversion Process Based on Numerical Investigation

Pan,

Zhou,

Jiang

2024

Buildings

View full text Add to dashboard Cite

show abstract

“…The failure mode of a shallow buried loess tunnel differs from that of different tunnels due to the loess' one-of-a-kind massive pore shape and vertical joint boom points [8]. In a shallow buried loess tunnel, the displacement of soil usually consists of two components.…”

Section: Failure Modementioning

confidence: 99%

“…According to the existing conditions on the construction site, there are many micro-cracks around the guide tunnel, mainly distributed on both sides of the excavation face of the guide tunnel. The cracks extend diagonally upward along both sides of the tunnel to the top of the transverse passage, and the micro-crack propagation from the top of the transverse passage to the ground cannot be observed [15]. In order to prevent cracks from continuing to expand due to excessive settlement of the dome of the guide tunnel, temporary transverse and longitudinal steel supports are set in the guide tunnel, and micro-cracks are reinforced by grouting [16].…”

Section: Basic Principlementioning

confidence: 99%

Calculation of Rock Pressure in Loess Tunnels Based on Limit Equilibrium Theory and Analysis of Influencing Factors

Danjiang,

Junfeng,

Jianguo

et al. 2023

TECM

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The research on the calculation method of tunnel envelope pressure is a key issue in the design of tunnel engineering support structure. Based on the limit equilibrium theory, this paper proposes a method to calculate the surrounding rock pressure in shallow buried loess tunnels. Firstly, based on the investigation of the damage mode of the loess tunnel surrounding rock and the field measurement results of the surrounding rock pressure, the damage mode of the loess tunnel is proposed, and then a method of calculating the surrounding rock pressure applicable to the shallow buried loess tunnel is derived according to the limit equilibrium condition of the tunnel square soil body and the side wedge; the basic mechanical parameters are known in this method, so only the rupture angle β needs to be determined, and the rupture angle calculation model in the shallow buried loess tunnel is proposed Three assumptions are made in the rupture angle calculation model, and the rupture angle calculation formula is derived according to the stress state on the slip surface of the surrounding rock; the pressure of the surrounding rock in the loess tunnel obtained by this method is compared with four methods, namely, the pressure theory of the surrounding rock in the existing loose body of Taishaki, the pressure formula of the deeply buried surrounding rock in the railroad tunnel design code, the Beer Baumann method, and the Xie Jiayi method, in order to verify the correctness and validity of the calculation method used, and to analyze the influence of different parameters on the surrounding rock pressure. The innovation of this paper lies in the derivation of a method for calculating the pressure in the surrounding rock of a shallow buried loess tunnel using the limit equilibrium theory, and also further proposes a formula for calculating the rupture angle. The pressure of surrounding rock decreases with the increase of static earth pressure coefficient, lateral pressure coefficient, friction angle and cohesion in soil, but the static earth pressure coefficient has a greater influence on the surrounding rock pressure. With the increase of sagittal span ratio, tunnel burial depth and soil weight, the surrounding rock pressure peaked with the increase of tunnel burial depth, and the surrounding rock pressure curve increased first and then decreased.

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New Method for Calculating Soil Pressure on Shallow Underground Structures in Layered Soil

Pan,

Zhou,

Han

et al. 2024

Geotech Geol Eng

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A Study on the Formation Mechanism and Calculation Method of Surrounding Rock Pressure in Shallow-buried Loess Tunnel Considering the Influence of Vertical Joints

Cited by 8 publications

References 57 publications

Mechanical Response and Stability Optimization of Shallow-Buried Tunnel Excavation Method Conversion Process Based on Numerical Investigation

Mechanical Response and Stability Optimization of Shallow-Buried Tunnel Excavation Method Conversion Process Based on Numerical Investigation

Calculation of Rock Pressure in Loess Tunnels Based on Limit Equilibrium Theory and Analysis of Influencing Factors

New Method for Calculating Soil Pressure on Shallow Underground Structures in Layered Soil

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