Journal ArticleDOI
Face Stability Evaluation of a TBM-Driven Tunnel in Heterogeneous Soil Using a Probabilistic Approach
Arash Eshraghi,Shokrollah Zare +1 more
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In this paper, the stability condition of a tunnel face excavated by an earth pressure balanced shield (EPBS) in Line 3 of the Tehran subway in Iran was investigated, and data simulation by Monte Carlo technique was applied.Abstract:
The stability condition of the tunnel face is of great importance in both conventional and modern [tunnel-boring machine (TBM)] methods of construction. Inadequate and excessive amounts of support pressure toward the face lead to surface settlement and blowout, respectively, whereas blowout occurs only in cases of pressurized shield implementation. In this research, the stability condition of a tunnel face excavated by an earth pressure balanced shield (EPBS) in Line 3 of the Tehran subway in Iran was investigated. Considering the sensitivity of urban facilities to ground movement, and to reduce uncertainty, data simulation by Monte Carlo technique was applied. Random data generated through a simulation process were used in an analytical method to calculate the factor of safety and its probability of being less than a predetermined value for a certain amount of applied support pressure. The soil was modeled by finite-element software, and the amount of face pressure at which the face collapses was...read more
Citations
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Journal ArticleDOI
Face stability analysis of a shallow tunnel in the saturated and multilayered soils in short-term condition
TL;DR: In this article, a new 3D collapse mechanism was proposed to investigate the face stability of a shallow tunnel embedded in the saturated and multi-layered soils with short-term condition.
Journal ArticleDOI
An analytical model to predict the limit support pressure on a deep shield tunnel face
TL;DR: In this article, the authors presented a multi-arch model to predict the limit support pressure (LSP) acting on a tunnel face for deep shield tunnelling in dry cohesionless soils based on the limit equilibrium method.
Journal ArticleDOI
Probabilistic assessment of tunnel convergence considering spatial variability in rock mass properties using interpolated autocorrelation and response surface method
TL;DR: In this article, an iterative procedure using the first-order reliability method (FORM) and response surface method (RSM) is employed to compute the reliability index and its corresponding design point.
Journal ArticleDOI
Undrained stability of a single circular tunnel in spatially variable soil subjected to surcharge loading
Journal ArticleDOI
Reliability study on shield tunnel face using a random limit analysis method in multilayered soils
TL;DR: In this paper, a random limit analysis method (RLAM) is proposed for tunnel face stability analysis, which adopts random fields to describe the spatial variability of soil strength parameters, and employs the upper bound theorem of limit analysis to determine the critical state of tunnel face.
References
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Journal ArticleDOI
Associated and non-associated visco-plasticity and plasticity in soil mechanics
TL;DR: The visco-plastic model is established as a realistic general description of soil behaviour as well as a computationally convenient fiction for solving any properly formulated plasticity problem as discussed by the authors.
Journal ArticleDOI
Upper and lower bound solutions for the face stability of shallow circular tunnels in frictional material
E. Leca,L. Dormieux +1 more
TL;DR: In most cases the ground itself is not suitable for underground urban development as well as for transportation, tunnels need to be driven in increasingly difficult soil conditions as mentioned in this paper, and in most cases, ground conditions are not suitable.
Journal ArticleDOI
Rotational failure mechanisms for the face stability analysis of tunnels driven by a pressurized shield
TL;DR: In this paper, two rotational failure mechanisms are proposed for both the active and passive cases, and an extension of the proposed collapse mechanism to include a tension cut-off in the classical Mohr-Coulomb failure criterion is presented and discussed.
Journal ArticleDOI
Fundamentals of Geotechnical Engineering
Braja M. Das,AT Sawicki +1 more
TL;DR: The first edition of the Fundamentals of Geotechnical Engineering was published in 2000 as discussed by the authors, which includes the fundamental concepts of soil mechanics as well as foundation engineering, including bearing capacity and settlement of shallow foundations spread footings and mats.
Journal ArticleDOI
Stability of a shallow circular tunnel in cohesionless soil
J. H. Atkinson,David M. Potts +1 more
TL;DR: In this paper, the stability of a circular tunnel in a cohesionless soil with support conditions similar to those found during construction is investigated theoretically and experimentally, based on upper and lower bound theorems.
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Upper and lower bound solutions for the face stability of shallow circular tunnels in frictional material
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