Direct Calculation Method for the Analysis of Non-linear Behavior of Ground-Support Interaction of a Circular Tunnel Using Convergence Confinement Approach

Lee, Yu-Lin; Hsu, Wen-Kuei; Lee, Chi-Min; Xin, Yi-Xian; Zhou, Boyu

doi:10.1007/s10706-020-01539-4

Cited by 5 publications

(4 citation statements)

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“…(5) The comparison results between the analytical solution of the explicit program and the published literature show a consistent trend in elastoplastic media. (6) The stress change caused by the advancing excavation of the tunnel face can be explained by the stress gradient, which is the difference between the far-field stress and the near-field stress around the tunnel. The increase in stress can be accounted for as part of the stress gradient using confinement losses.…”

Section: Discussionmentioning

confidence: 99%

“…That is to say, the impact of the unsupported distance on the advancing excavation of the working face is to consider the changes in stress and displacement caused by a certain observation section in the front after the continuous excavation of the tunnel. Based on the relevant basic research [6,7], using the tunnel convergence measurement data, a statistical regression analysis is used to establish a function related to the effect of tunnel face advancing excavation and to estimate the confinement loss. The function of this confinement loss curve (CLC) is shown in Figure 2.…”

Section: Relationship Between Tunnel Advancing Excavation Effect and ...mentioning

confidence: 99%

“…This is an important principle and concept used in the theory of the convergence-confinement method. The change in this stress can be described by the following expression [6,7]:…”

Section: Stress Variation Around a Circular Tunnelmentioning

confidence: 99%

“…When a tunnel is excavated, the primary stress in the rock mass is redistributed, causing the rock to deform and converge toward the opening. This convergence can lead to displacements, deformations, and potentially unstable conditions if not properly controlled [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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An Improved Incremental Procedure for the Ground Reaction Based on Hoek-Brown Failure Criterion in the Tunnel Convergence-Confinement Method

Lee

2023

Mathematics

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The purpose of this study is to introduce the Hoek–Brown nonlinear failure criterion into the convergence–confinement method (CCM), which is based on the linear failure criterion, and implant it into the ground reaction curve (GRC) in this theory. Based on consistent and rigorous theoretical analysis and according to the mechanical relationships, the principle of equilibrium, the material constitutive law, and the strain/displacement compatibility equation are used to deduce the closed-form analytical solution of the stress/displacement of the rock mass in the plastic region and to complete the simulation and interpretation of the nonlinear behavior of surrounding rock due to the advancing excavation of a circular tunnel. In this paper, confinement loss is regarded as the concept of increment in numerical analysis, and the calculation process and analysis steps of the explicit analysis method (EAM) are proposed. This method can not only realize the calculation of analytical solutions but can also be performed using simple spreadsheets. In addition, to verify the feasibility of this calculation method, this study uses published data to verify the validity of the analytical solution implemented by the incremental procedure and to study the influence of nonlinear failure criteria on the GRC, especially the mechanical behavior at the intrados of the tunnel and the distributions of tress/displacement on the cross-section of the tunnel. A comparison between the published results and the proposed solution in this study reveals consistent and favorable trends.

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Section: Discussionmentioning

confidence: 99%

Section: Relationship Between Tunnel Advancing Excavation Effect and ...mentioning

confidence: 99%

“…This is an important principle and concept used in the theory of the convergence-confinement method. The change in this stress can be described by the following expression [6,7]:…”

Section: Stress Variation Around a Circular Tunnelmentioning

confidence: 99%