Face Stability Analysis for the Earth Pressure Balance Method in Nonhomogeneous Inclined Soil Layers: Case Study

Shahmoradi, Javad; Rad, Hosein Salari; Roghanchi, Pedram

doi:10.1061/(asce)gm.1943-5622.0001833

Cited by 9 publications

(2 citation statements)

References 28 publications

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“…To ensure the safety and efficiency of the construction process, various methods have been developed to analyze the stability of the excavation face. These methods can be broadly categorized into three groups: theoretical methods, experimental methods, and numerical simulations [7,[11][12][13]. The limit equilibrium method (LEM) is a widely used theoretical approach to analyze tunnel face stability, which has been extensively studied by innovative researchers.…”

Section: Literature Reviewmentioning

confidence: 99%

Analysis of Excavation Parameters on Face Stability in Small Curvature Shield Tunnels

Niu

Ren

Zhou³

et al. 2023

Sustainability

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This study investigates the face stability of small curvature shield tunnels during excavation and its relationship with various excavation parameters. The stability of the excavation face is critical to the safety and efficiency of underground construction projects. Despite the increase in the use of small curvature shield tunnels in urban areas, research works on this type of tunnel are limited and the existing literature focuses only on straight shield tunnels. This study addresses this research gap through numerical simulations, analyzing the effects of different excavation parameters such as jacking force, cutting speed, and soil conditioning on face stability. The results of the study show that the excavation parameters significantly affect face stability. The findings can be used to optimize the performance of small curvature shield tunnels and support their continued development in urban areas.

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Section: Literature Reviewmentioning

confidence: 99%

Analysis of Excavation Parameters on Face Stability in Small Curvature Shield Tunnels

Niu

Ren

Zhou³

et al. 2023

Sustainability

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“…Broere et al [15,16] extended Terzaghi loose Earth pressure formula to layered soil and studied the influence of soil heterogeneity on slip angle and minimum support pressure. Shahmoradi et al [17] calculated the ultimate support pressure of the excavation face of the water conveyance tunnel considering the depth of the tunnel and the stratification of the stratum. In order to reduce the construction risk of underground engineering, Hernandez et al [18] used analytical methods to evaluate the support pressure of different tunnel covers.…”

Section: Introductionmentioning

confidence: 99%

Study on Stability of Shield Tunnel Excavation Face in Soil-Rock Composite Stratum

Sui

Dai

et al. 2021

Mathematical Problems in Engineering

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In order to study the instability mode of shield excavation face in soil-rock composite stratum and determine the ultimate support pressure of excavation face, this paper selects two typical soil-rock composite strata and uses three-dimensional finite element software to study the failure development process of shield excavation face. Based on the principle of limit equilibrium, a calculation model of limit support pressure for soil-rock composite stratum is proposed and applied to practical engineering. It is found that the shape of “unloading loosening zone” is mainly determined by the properties of upper soil and the properties of lower rock mainly determine the scope and shape of “sliding instability zone.” With the increase of soil proportion coefficient, the ultimate bearing capacity increases nonlinearly and the growth rate decreases gradually. At the same time, the influence of overlying Earth pressure and soil cohesion cannot be ignored.

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Review of tunnels and tunnelling under unfavourable geological conditions

Zhang,

Tang,

Yang

et al. 2024

Geological Journal

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Considering the rapid expansion of the economy and the increasing demand for infrastructure development, the scale of the tunnelling is expanding, and tunnel is inevitably excavated under unfavourable geological conditions. Consequently, this brings multitude of risks and challenges to tunnels and tunnelling. This paper summarizes the engineering issues associated with five unfavourable geological conditions: soft soil strata, soft and hard composite strata, spatially variable strata, karst strata and subsea conditions. Various analysis methods for deformation problem of tunnel and tunnelling under these unfavourable geological conditions are discussed. The mechanisms of the progressive failure of tunnel faces and collapses of caves in karst tunnels are also presented, as well as the risk assessments and prevention strategies for karst tunnel and water inrush occurrences of subsea tunnel. Furthermore, the analysis of the response of subsea tunnels to dynamic loads such as wave forces and earthquakes is summarized. Additionally, the analysis and prevention techniques for constructing subsea tunnels in fault zones are also considered. Finally, this paper offers a glimpse into potential research directions for future analysis relevant to the topic discussed, aiming to provide guidance for secure construction and maintenance tunnels under unfavourable geological conditions.

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Face Stability Analysis for the Earth Pressure Balance Method in Nonhomogeneous Inclined Soil Layers: Case Study

Cited by 9 publications

References 28 publications

Analysis of Excavation Parameters on Face Stability in Small Curvature Shield Tunnels

Analysis of Excavation Parameters on Face Stability in Small Curvature Shield Tunnels

Study on Stability of Shield Tunnel Excavation Face in Soil-Rock Composite Stratum

Review of tunnels and tunnelling under unfavourable geological conditions

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